Answer:
The definition of work is:
Force (dot product) distance = work
The dot product of vectors at right angles is zero - so no work can be done if the applied force is at a right angles to direction of motion
A child swings back and forth on a swingset 40 times in 50 seconds. Find their frequency.
Answer:
.8
Explanation:
40 times is 40 'cycles' in 50 seconds
40 / 50 = .8 Hz ( f= Hz is cycles per second)
If you push on a small car that is stuck in the mud, why do you sink into the
ground as you push on the car?
As you're applying force to the car, the mud which is a sinking surface would but you in the same place as the car is. The car is stuck in the mud and sunk to point where it cannot be pulled out unless an outside force interferes. When you apply force into the car and try to push it out, you would be put in the same situation. You would be experiencing friction which is an opposing force, in this problem, a simple machine such as a pulley would be helpful as it can lift the car from the outside. The car would act as a load and someone or some type of machine can use force to pick the car out of the mud. But if you were to try to push it out of the mud, you would just sink as the force applied would only put you in the same situation as the car, overall resulting in both beings (objects - car, human - "you" POV) being stuck in the same conumdrum.
Answer:
See below
Explanation:
Gravity will pull you down as you stand in the mud.
Additionally , if you do not push exactly horizontally ......like you push UP some , the equal and opposite force will push YOU down into the mud.
This would be like picking up a weight while you are standing there
F = ma will be greater and you will get muddier !
The vertical distance covered by a body falling freely under gravity is directly proportional to the square of the time for which it falls. If a body covers 300m in the first 10 seconds of its free fall, find the distance covered by the body in the next 10 seconds.
Answer:
S = 1/2 a t^2 distance covered by falling body from speed = 0
300 = 1/2 a 10^2
a = 600 m / 100 s^2 = 6 m/s^2
v = a t = 6 m/s^2 s * 10 s = 60 m/s speed after 10 sec
S2 = v t + 1/2 a t^2
S2 = 60 m/s * 10 sec + 3 m/s^2 * 100 s^2
S2 = 600 m + 300 m = 900 m
____________loosens up your muscles and brings your heart rate up in a slow, steady way that’s better for your body.
A.
Sprinting
B.
Cooling down
C.
Warming up
D.
Weightlifting
Answer:
C ) Warming up
Explanation:
C:
~Chiena
Answer:
B
Explanation:
hope it helps <33
I would really appreciate the help on this pass paper question.
Answer:
Heat lost thru doors & windows = (100 - 75 - 5) = 20
20% is the fraction of heat lost thru doors and windows
One wants to obtain the largest savings per unit of cost
roof:
200 / 600 = 1/3
150 / 1000 = .15
40 / 2300 = .017
The largest of these is 1/3 so the most benefit would be obtained by insulating the roof
Since heat loss thru the roof depends on heat loss thru the attic, this is the most cost effective in reducing heat loss
The more the difference in temperature between the ceiling and roof (attic) the more heat will be lost thru the roof, so insulating the roof will decrease the heat loss of the attic
A child pushes, with a constant force, a merry-go-round with a radius of 2.5 m, from rest to an angular velocity o
f 3.0 rad/s in 8.0 s. What is the merry-go-round's tangential acceleration? What is the merry-go-rounds
centripetal acceleration? What is the merry-go-rounds angular acceleration?
The centripetal acceleration of the merry-go-round is 0.938 m/s² and the angular acceleration of the merry-go-round is 0.375 rad/s².
Angular velocity of the merry-go-roundThe angular acceleration of the merry-go-round is calculated as follows;
α = ω/t
α = 3/8
α = 0.375 rad/s²
Centripetal acceleration of the merry-go-roundThe centripetal acceleration of the merry-go-round is calculated as follows;
a = αR
a = 0.375 x 2.5
a = 0.938 m/s²
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A 0.4 kg rock is dropped through a 6m height. Find its speed as it hits the ground. What is its speed at half way down?
Answer:
83.1557575 M/s
Explanation:
V²=u²+2as
v=[tex] \sqrt{u ^{2} { + 2as}^{ } } [/tex]
u is initial velocity =0
here a =g
[tex]v = \sqrt{2gs} [/tex]
v=
[tex] \sqrt{2 \times 9.8 \times 6} [/tex]
v= 83.1557575 M/s
what does Atomic Collisions mean
Answer:
Atomic and molecular collision processes are the physical interactions of atoms and molecules when they are brought into close contact with each other and with electrons, protons, neutrons or ions. This includes energy-conserving elastic scattering and inelastic scattering.
A glance at the speedometer on your vehicle will tell you your overall:_____.
a. speed. b. acceleration. c. instantaneous speed. d. average speed.
A glance at the speedometer on your vehicle will tell you your overall instantaneous speed .
The speedometer of a vehicle reveals information about the instantaneous speed of your vehicle. It shows your speed at a particular instant in time.
What is speedometer ?"A speedometer in a vehicle is an important instrument in a vehicle which shows the current speed of the vehicle and the distance of the vehicle travelled primarily. It is measuring the instantaneous values of speed and distance not the average value of the distance and the speed."
What is speed ?"The rate of change of position of an object in any direction. Speed is measured as the ratio of distance to the time in which the distance was covered. Speed is a scalar quantity as it has only direction and no magnitude."
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How would life on earth be different if its axis was not tilted with respect to its orbit?.
Answer:
oone side at a time would be hot and the other oone
Explanation:
One side will be hot and the other cold no in-between
A force of attraction would exist between
Answer:
A south and north pole (negative and positive pole)
Explanation:
Because opposites attract
Acceleration depends on which two factors?
A) mass and position
B) net force and mass
C) mass and velocity
D) position and net force
Taking into account the Newton's second law, acceleration depends on position and net force (option D).
Newton's second lawAcceleration in a body occurs when a force acts on a body. There are two factors that influence the acceleration of an object: the net force acting on it and the mass of the body.
Newton's second law states that this force will change the speed of an object because the speed and / or direction will change. These changes in velocity are called acceleration.
So, Newton's second law defines the relationship between force and acceleration mathematically. This law says that the acceleration of an object is directly proportional to the sum of all the forces acting on it and inversely proportional to the mass of the object.
Mathematically, Newton's second law is expressed as:
F= m×a
where:
F = Force [N]m = Mass [kg]a = Acceleration [m/s²]SummaryIn summary, the acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. (option D)
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What are two pieces of evidence that support the big bang theory?.
6. Jones covered a distance of 50 miles on his first trip. On a later trip he traveled 300 miles while going three times as fast. His new time compared with the old time was: (a) three times as much, (b) twice as much, (c) the same, (d) half as much, (e) a third as much
first trip= 50 miles.
second trip= 300 miles.
to find:his new time compared to the old time.
solution:Let speed of the 1st trip x miles / hr. and speed of the 2nd trip 3x / hr.
Speed = Distance/Time
So, times taken to covered a distance of 50 miles on his first trip = 50/x hr.
= 100/x hr
Therefore, his new time compared with the old time was twice as much.
answer= b) twice as much
what amount of heat is removed to lower the temperature of 80 grams of water from 75°C to 45°C? the specific heat of liquid water is 4.18J/g°C
Answer: option A.
Explanation:
Q= heat removed from the water
m= mass of the water = 80 grams
c = heat capacity of water= 4.18 J/g°C
Q = -10,032 joules -10,000 Joules
Negative sign indicates that heat was removed from the water
Answer:
10032 J must be removed
Explanation:
80 gm * (75-45 C) * 4.18 J/g-C = 10032 J
If Frequency F, velocity v, and density D are considered fundamental units, the dimensional formula for momentum will be :
Let's see
Momentum be P
[tex]\\ \rm\Rrightarrow P=[Frequency]^a[velocity]^b[Density]^c[/tex]
[tex]\\ \rm\Rrightarrow [P]=[F]^a[v]^b[D]^c[/tex]
[tex]\\ \rm\Rrightarrow [M^1L^1T^{-1}]=[T^{-1}]^a[L^1T^{-1}]^b[M^1L^{-3}]^c[/tex]
[tex]\\ \rm\Rrightarrow MLT^{-1}=T^{-a}L^bT^{-b}M^cL^{-3c}[/tex]
[tex]\\ \rm\Rrightarrow MLT^{-1}=T^{-a-b}L^{b-3c}M^c[/tex]
On comaparing
c=1So
b-3c=1b-3=1b=1+3b=4and
-a-b=-1-a-4=-1-a=-1+4=3a=-3So the unit is
DV⁴/F³Answer:
(Frequency)⁻³(velocity)⁴Density
Explanation:
See attachments.
general effects of global warming
Answer:
Warmer temperatures over time are changing weather patterns and disrupting the usual balance of nature. This poses many risks to human beings and all other forms of life on Earth.Changes in temperature cause changes in rainfall. This results in more severe and frequent storms. They cause flooding and landslides, destroying homes and communities, and costing billions of dollars.Water is becoming scarcer in more regions. Droughts can stir destructive sand and dust storms that can move billions of tons of sand across continents. Deserts are expanding, reducing land for growing food. Many people now face the threat of not having enough water on a regular basis.In an experiment, two objects, object X and object Y, travel toward each other and collide. Data are collected about
each object before, during, and after the collision, as shown in the table. Which ofthe following pairs of data, when
used together to create two graphs, could verify the conservation of momentum? Select two answers.
A) Average force exerted on object X by object Y and time of collision, because these measurements can be used to determine the change in momentum of object X.
B) Average force excreted on object Y by object X and time it collision, because these measurements can be used to determine the change in momentum of object Y.
C) Mass of object X and velocity of object X before collision, because these measurements can be used to determine the initial momentum of object X.
D) Mass of object Y and velocity of object Y before collision, because these measurements can be used to determine the initial momentum of object X.
(a) Average force exerted on object X by object Y and time of collision, because these measurements can be used to determine the change in momentum of object X.
(b) Average force excreted on object Y by object X and time it collision, because these measurements can be used to determine the change in momentum of object Y.
What is conservation of linear momentum?The principle of conservation of linear momentum, states that in the absence of external force, the sum of initial momentum must be equal to sum of final momentum.
P = mv
where;
m is massv is velocityp is momentumF = mv/t
Ft = mv
J = Δmv
where;
J is impulse = FtΔmv is change in momentummass of object X and object Y are constant, and cannot be used create graphs.
Impulse (product of force and time) received by an object is equal to change in the momentum of the object.
Thus, the pairs of data that can be used together to create two graphs, to verify the conservation of momentum are;
(a) Average force exerted on object X by object Y and time of collision, because these measurements can be used to determine the change in momentum of object X.
(b) Average force excreted on object Y by object X and time it collision, because these measurements can be used to determine the change in momentum of object Y.
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After you chew and swallow, food enters your digestive system where it can be broken down.
A.
True
B.
False
Answer:
A
Explanation:
Technically, your mouth is part of the digestive system though so I am not sure how accurate this question is.
The Hermes is a rotating space station that allows its occupants to experience simulated gravity. If its angular velocity is 0.66 rad/s and gives a simulated gravity of 0.4g, what is its diameter?
Answer:
a = v^2 / R = ω^2 R centripetal acceleration
.4 g = .4 * 9.80 m/s^2 = 3.92 m/s^2
R = a / ω^2 = 3.92 / .66^2 = 9.0 m
D = 2 R = 2 * 9.0 = 18.0 m diameter
*Two objects have an elastic collision. Before the collision they approach one another with a velocity of 45 m/s. With what speed will they be separating after the collision?
In the elastic collision, the velocity of approach and velocity of separation is the same. The velocity of the separation after the collision will be 45 m/s.
What is collision?The abrupt, violent coming together in direct contact of two bodies is known as the collision. a falling object and a floor are examples of collisions.
When the distance between two ships decreases while the bearings remain constant, a collision occurs.
Objects have an elastic collision. Before the collision, they approach one another V1= V2=45 m/sec
The velocity of the approach is found as;
[tex]\rm = U_1-U_2 \\\\\ = 45-45 \\\\ = 0[/tex]
As we know,
[tex]\rm e = \frac{U_2-U_1}{V_2-V_1}[/tex]
The velocity of separation is found as;
[tex]\rm V_1-V_2[/tex]
and, e=1 for elastic collision.
[tex]\rm U_1-U_2=V_2-V_1[/tex]
[tex]\rm V_2-V_1 = 0 \\\ V_2 = V_1 = 45 \ m/sec[/tex]
In the elastic collision, the velocity of approach and velocity of separation is the same.
Hence the velocity of the separation after the collision will be 45 m/s.
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If an airborne diver goes from a full layout position to a tuck position, what will happen to his angular momentum
If an airborne diver goes from a full layout position to a tuck position. Its angular momentum remains the same.
What is angular momentum ?The rotational analog of linear momentum is angular momentum also known as moment of momentum or rotational momentum.
It is significant in physics because it is a conserved quantity. The total angular momentum of a closed system remains constant. Both the direction and magnitude of angular momentum are conserved.
Hence, Its angular momentum remains the same.
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hello people ~
If a unit positive charge is taken from one point to another over an equipotential surface, then
(a) work is done on the charge.
(b) work is done by the charge.
(c) work done is constant.
(d) no work is done.
Answer:
(d) no work is doneExplanation:
Since the potential at each point of an equipotential surface is the same, the potential does not change while we move a unit positive charge from one point to anotherTherefore work done in the process is zero or no work is doneAnswer:
No work done
Explanation:
When a unit positive charge us taken from one point to another over an equipotential surface then
As it's equipotential no Displacement will happenAs no Displacement hence dw=0
No work done
What is meant by the "objectivity" of web documents, and what are the three things to look for when evaluating a website for objectivity? (site 1)
Objectivity refers to the ability of a writer to present ideas or situations factually as they are without partiality.
What is objectivity in writing?Objectivity refers to the ability of a writer to present ideas or situations factually as they are and not based on his or her own preconceived notions or bias.
To check for objectivity in a web document, one has to ;
check the source of the material compare different web documents with itcheck on the websites credibility rating from othersTherefore, objectivity means being truthful and impartial.
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Two bars, bar 1 and bar 2, are at rest on a smooth horizontal table as shown in the top view above. Each bar is connected to the table with a vertical pin. Bar 1 and bar 2 are made from the same material and have the same physical dimensions, but bar 1 has three additional large holes drilled through it. The two bars are each accelerated from rest by forces of equal magnitude F
applied at their right end. The forces remain perpendicular to the bars and the forces are exerted for an equal amount of time t1
.
(a) Briefly explain using physics principles why the angular displacement for bar 1 is larger than the angular displacement for bar 2.
Bar 1 has larger angular displacement than bar 2 because it has more revolutions per second due to its larger hole size.
Angular speed of the bars
Angular speed is the rate of change of angular displacement with time.
ω = θ/t
where;
ω is angular speedθ is angular displacementt is time of motionThe bar with three additional large holes drilled through it (bar 1), will have more rotation per second because its holes are bigger than that of bar 2.
The bar with more rotations or angular speed will have more angular displacement.
Thus, bar 1 has larger angular displacement than bar 2 because it has more revolutions per second due to its larger hole size.
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Which phase of the moon is shown?
full moon
first quarter
waning gibbous
waxing crescent
The more light bulbs you add to a series circuit, the _______ the lights will become.
A. Brighter
B. Dimmer
C. Hotter
D. None of the Above
Answer:
brighter
Explanation:
the more light bulbs you add to a series of circuits, the brighter the room will be.
Balance the nuclear equation by giving the mass number, atomic number, and element symbol for the missing species.
The complete equation for the nuclear reaction is 10/5 B + 4/2He ------> 13/7N + 1/on
What is a nuclear reaction?A nuclear reaction is one in which the nucleus of one isotope is changed into the nucleus of another isotope. In this process some particles may be released.
Looking at the reaction equation, we know that the complete equation for the nuclear reaction is 10/5 B + 4/2He ------> 13/7N + 1/on
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Which statement best describes heat and thermal energy?
O They are different words for the same thing.
O They represent different concepts.
O Heat is what happens when thermal energy stops moving between substances.
O Thermal energy is what happens when heat moves between substances.
Liquid pools of methane are found on the surface of Titan, one of Saturn's moons. The temperature on the surface of Titan is -180°C. What is this value on the Fahrenheit scale?
Answer:
-292 degrees F
Explanation:
C = 5/9( F -32)
-180 = 5/9 (F-32)
F = -292 degrees