A car of 900 kg mass is moving at the velocity of 60 km/hr. It is
brought into rest at 50 metre distance by applying brake. Now,
calculate the force required to stop the car. [Ans: 2500 N] class 9

Answer:

S=2,P=6,D=10,F=14. The total number of electrons contained by s,p,d,f subshells is 32

Answer:

Climbing stairs and lifting objects is work in both the scientific and everyday sense—it is work done against the gravitational force. When there is work, there is a transformation of energy. The work done against the gravitational force goes into an important form of stored energy that we will explore in this section.



Figure 1. (a) The work done to lift the weight is stored in the mass-Earth system as gravitational potential energy. (b) As the weight moves downward, this gravitational potential energy is transferred to the cuckoo clock.

Let us calculate the work done in lifting an object of mass m through a height h, such as in Figure 1. If the object is lifted straight up at constant speed, then the force needed to lift it is equal to its weight mg. The work done on the mass is then W = Fd = mgh. We define this to be the gravitational potential energy (PEg) put into (or gained by) the object-Earth system. This energy is associated with the state of separation between two objects that attract each other by the gravitational force. For convenience, we refer to this as the PEg gained by the object, recognizing that this is energy stored in the gravitational field of Earth. Why do we use the word “system”? Potential energy is a property of a system rather than of a single object—due to its physical position. An object’s gravitational potential is due to its position relative to the surroundings within the Earth-object system. The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0. We usually choose this point to be Earth’s surface, but this point is arbitrary; what is important is the difference in gravitational potential energy, because this difference is what relates to the work done. The difference in gravitational potential energy of an object (in the Earth-object system) between two rungs of a ladder will be the same for the first two rungs as for the last two rungs.

Converting Between Potential Energy and Kinetic Energy

Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem). We will find it more useful to consider just the conversion of PEg to KE without explicitly considering the intermediate step of work. (See Example 2.) This shortcut makes it is easier to solve problems using energy (if possible) rather than explicitly using forces.

More precisely, we define the change in gravitational potential energy ΔPEg to be ΔPEg = mgh, where, for simplicity, we denote the change in height by h rather than the usual Δh. Note that h is positive when the final height is greater than the initial height, and vice versa. For example, if a 0.500-kg mass hung from a cuckoo clock is raised 1.00 m, then its change in gravitational potential energy is

mgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 Jmgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 J

Note that the units of gravitational potential energy turn out to be joules, the same as for work and other forms of energy. As the clock runs, the mass is lowered. We can think of the mass as gradually giving up its 4.90 J of gravitational potential energy, without directly considering the force of gravity that does the

Answer:

MASS

Explanation:

mass is the quantity of matter contained in the body.

Answer:

0.000621 mile

1.094 yards

3 feet 3.37 inches

39.37 inches

Answer:

1m = 0.000621371 miles = 1.09361 yards = 3.28084 feet = 39.3701 inches

Answer:

49.050 KW

Explanation:

work done = PE

= mgh

=5000×9.81×10

=490500J

power = workdone/Time taken

= 490500/10

= 49050 watts

= 49.050kW

Answer:

I'll just give short and simple explanation .

Explanation:

when the distance between the masses are doubled but the masses remain the same then,

the gravitational force between two masses decrease by four times when the distance between them is doubled.

hope this helped you

any confusion then comment it.

Answer:

5 significant figures

Explanation:

As the question does not state any term in 'significant figures', I will provide the number and the number of significant figures.

First of all, the number. 2.34 × 10³ = 2340, and 5.1 × 10^-2 = 0.051, therefore. 2340 × 0.051 = 119.34.

This will be equal to 5 significant figures.

Its speed is 4m/s

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Answer:

The relative mass of the proton would be 1 and that of the electron

would be about 1/1840.

Answer:

16.18 mph

Explanation:

the speed of elevators =

(783×3600)/(33×5280) =

2,818,800/174,240 = 16.18 mph

Answer:

motion is the act of changing location or position

Answer:

Motion is generally defined as an increase in distance with respect to time.

Answer:

The ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine is called mechanical advantage.

Answer:

The world would have been blown up by now.

Explanation:

Hypothetically, lets say that someone gave Kim Jong boi a cup of coffee.

He gets mad at the "public servant" since it didn't contain 3 posafa43asdunds of sugar which makes him "big".

The public servant claims they added jfoaj4su38093 units of sugar, which is equivalent to 3 posafa43asdunds.

He gets mad and launches big cannons at Trump since he blames Boe Jiden.

Answer:

F = M a    Newton's second law

F = - K x     force exerted by compressed spring

a = - K x / M

a) is true because the ball originally is accelerated due to gravity and this acceleration will decrease as the spring in compressed

One could argue for (d) if the downward direction was designated as negative

Prior to maximum compression of the spring the velocity would negative and as the spring began to extend (and the ball began move upward) the velocity of the ball would change from negative to positive

Answer:

If we assume that the box is a cube with 150 m² surface area

Area of 1 face = 150 m² / 6 = 25 m²

The box will exert a downward force of

Force = mass * acceleration due to gravity

Force = 300 kg * 9.81 m/s² N

Force = 2943 N

The box exerts a pressure ( force / unit area) = 2943 N / 25 m²

Pressure = 117.7 N/m²

Thank you, if you found this helpful please comment.

Liquid A has a density of 1.27 g/mL and liquid B has a density of 0.78 g/mL. Both are poured into the same container. If the liquids do not react chemically then the liquid B which has a density of 0.78 g/m would come over the liquid because it is a lighter fluid having less density than the liquid A

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

formula for density

ρ = mass / volume

Liquids A and B have densities of 1.27 and 0.78 grams per milliliter, respectively. The same container receives both of them. If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/m, would emerge on the top because it is a lighter fluid and has less density than liquid A.

Thus, If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/ml, would emerge on the top because it is a lighter fluid and has less density than liquid A.

Learn more about density from here

brainly.com/question/15164682

#SPJ2

Answer:

Newton

it is derived of mass and displacement

Answer:

Pressure at any particular point in a liquid is transmitted in all directions

Explanation:

The total mass of your catch is 13.1 kg

Since you have three fishes a bass, a rock cod, and a salmon with masses of 1.07 kg, 6.0 kg, and  6.05 kg, respectively,

The total mass of your catch = mass of bass + mass of rock cod + mass of salmon

= 1.07 kg + 6.0 kg + 6.05 kg

= 13.12 kg

Since the total mass of your catch is 13.12 kg and we have three catches with two catches to two decimal places and one catch to one decimal place.

We cannot have more decimal places in our answer than the number of decimal places in the number with the least number of decimal places.

Since the least number of decimal places is in the mass of the rock cod which is 6.0 kg, the total mass of our catch is thus 13.1 kg to one decimal place.

So, the total mass of your catch is 13.1 kg

Learn more about significant figures here:

https://brainly.com/question/17343107

Answer:

mass of block = 4500g

Explanation:

density = mass/volume

mass = volume x density

         = 150 x 30

         = 4500 g

Answer:

The values of gravitational force and gravitational constant become same or equal when product of masses involved equals the square of distance between them.

Answer:

Amperes

Explanation:

It is named after a French physicist  André-Marie Ampère.

HOPE THIS HELPED

The unit of electric current is Ampere, and it is named after the French physicist André-Marie Ampère (1775 - 1836).

Answer: 625000 J

Explanation:

KE= (1/2)mv^2

m=500kg

v=50m/s

KE= (1/2 )(500)(50)^2

= 625000 J

Answer:

Angular momentum is inertia of rotationmotion. Linear momentum is inertia oftranslation motion. The big difference is that the type of motion which is related to each momentum is different.

Answer:

A yxiigxih5dd8yixc99uf8g

Answer:

[tex]s = ut + \frac{1}{2} at^{2} \\ ut = s - \frac{1}{2} a {t}^{2} \\ u = (s - \frac{1}{2} a {t}^{2} ) \div t \\ u = (s - \frac{1}{2} a {t}^{2} ) \times \frac{1}{t} \\ \\ u = \frac{s}{t} - \frac{1}{2t} a {t}^{2} \\ \\ u = \frac{s}{t} - \frac{1}{2} at \\ [/tex]

I hope I helped you^_^

Answer:

2.25A

Explanation:

that is the answer

Your answer is in the attachment . Hope this helps.

Answer:

B

Explanation:

At the highest/maximum point the vertical velocity is zero because as the projectile is launched it eventually changes direction. At this instant it momentarily stop causing the maximum velocity to be zero.

hopefully this makes sense

:)

Answer:

gdfhf

Explanation: