Four forces are acting on a block as shown in the figure. What is the net force on the block?

Answer:

10g to kg=0.01

20×0.01=0.2

Force of 0.2N

Answer:

a) the result capacitor

ct=c1+c2+c3+c4

ct=2×10^-6+4×10^-6+6×10^-6+8×10^-6

ct=20×10^-14

b)q=ct×v

q=20×10^-14×50

q=1000×10^-14 c

Explanation:

c)v1=q/ct

v1=1000×10^-14/20×10^-14

v1=50 volt

v2=

By Hooke's law, the spring exerts a restoring force with magnitude F when compressed by a distance x according to

F = kx

where k is the spring constant. Solve for k :

k = F / x = (108.0 N) / (0.0191 m) = 5654.45 N/m

Now solve for F when x = 0.0440 m :

F = (5654.45 N/m) (0.0440 m) = 248.796 N ≈ 249 N

Answer:

 speed 9/speed 4   =   2sqrt3 / 3

Explanation:

KE = 1/2 m v^2

for 9 kg   = 3 * the 4 kg      1/2 (9)va^2   = 3* 1/2 (4) vb^2

va^2 / vb^2 = 3*  1/2 (4) / (1/2 *9)

                      6 / 4.5

va / vb = sqrt (6/4.5) =  2sqrt3 /3

ratio of the 9 speed  to the speed of the 4   is  2 sqrt 3 /3

Answer:

The three best answers are:

Electric fields can be positive or negative  (depending on source)

Electric fields can attrace or repel objets         (assuming the object is charged)

Electric forces are strongest near the charged object       E ∝ 1 / R^2

The total metabolic energy used by each to complete the course is determined as 656.91 J.

The kinetic energy of Jessie and Jaime is calculated as follows;

K.E = ¹/₂mv²

where;

15 km/h = 4.17 m/s

5 km/h = 1.39 m/s

K.E = ¹/₂(68)(4.17)² + ¹/₂(68)(1.39)²

K.E = 656.91 J

Thus, the total metabolic energy used by each to complete the course is determined as 656.91 J.

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Answer:

D

Explanation:

Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion.

A=9.8m/s^2 or the gravitational accelerational

If a stone dropped from the roof of a single-story building to the surface of the earth speeds up because of an almost constant force of gravity acting upon it,there4fore the correct answer is option D.

It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another,

For any free-falling object, the acceleration due to gravity is constatant.

The correct response is option D if a stone thrown from the roof of a one-story structure to the surface of the ground accelerates due to an almost constant force of gravity acting upon it.

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Answer:

32.6 years

Explanation:

The time required to move from the equilibrium position directly to a point a will be 0.879 sec.

The period is the amount of time it takes for a particle to perform one full oscillation. T is the symbol for it. Taking the reciprocal of the frequency yields the frequency of the oscillation.

The standard equation for the SHM is found as;

[tex]\rm x = asin \omega t \\\\ \rm 12.3 \times 10^{-2} = 18.0 \times 10^{-2}sin \omega t \\\\ 0.6833=sin \omega t \\\\ \omega t =sin^{-1}0.6833 \\\\ \omega t =0.7522 \\\\ t = \frac{0.7522}{0.855 } \\\\ t=0.879\ sec[/tex]

Hence the time required to move from the equilibrium position directly to a point a will be 0.879 sec.

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Answer:

fringes move farther

Explanation:

The relation between the distance between the fringes is given by

y = Dλ/d

where, D is the distance between the plane of slit and the screen

d is the width of slit, λ is the wavelength of light used.

As the slit made narrower, that means d decreases, the value of y increases, that means the fringes move farther.

Explanation:

Comets are mostly made of ice and dust

Answer:

The main difference between asteroids and comets is their composition, as in, what they are made of. Asteroids are made up of metals and rocky material, while comets are made up of ice, dust and rocky material. Both asteroids and comets were formed early in the history of the solar system about 4.5 billion years ago.Explanation:

The composition of a star is determined from the red or blue shift of spectral lines in a spectrum, the width of the spectral lines in the spectrum.

The study of light and other radiation absorption and emission by matter is called spectroscopy. Electromagnetic radiation into its constituent wavelengths, in a spectrum, just like a prism splits light into a rainbow of colors.

The composition of a star is determined from the red or blue shift of spectral lines in a spectrum, the width of the spectral lines in the spectrum.

Hence, option D is correct.

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Answer:

Explanation:

          ρ =

making mass subject of formula we have

 m=ρv

from the question aluminium and zinc have same mass hence we can say;

The Federal Reserve helps to regulate the economy of the United States. So, the correct option is D.

Marketing is defined as the activities done for promoting the products through creating offers and communicating to the customers.

Here,

The Federal Reserve of the United state is functioning as a Central Bank, such that they are maintaining the financial aspects of the system.

The Federal Reserve has a great role in regulating the financial system and at the same time, the establishing of the monetary policies.

The primary functions of the Federal Reserve includes the functions of maintaining the banking operations and reliable payments for the system.

Hence,

The Federal Reserve helps to regulate the economy of the United States.

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Answer:

Ionic Compound

Explanation:

We know that an ionic compound dissolves easily in water. Its melting point is very high, and it is a conductor.

The equation for Ionic Compound (IC) versus Electricity (EC) is

IC=1/2 divided by EC

EC is the base for the mathematics, so EC is a base warmth at 360.

360 divided by 1/2 is 180

That is the speed in which the current has.

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Answer:

silver

Explanation:

It is because it contains a higher number of movable atoms ( free electrons)

The characteristics shared by both heating and cooling curves is that phases changes when the temperature stays the same.

Heating is the process by which the temperature of a place or substances or object is increased.

Cooling Is the process of lowering the temperature of a substance or object by using conditioners or by freezing .

Therefore, The characteristics shared by both heating and cooling curves is that phases changes when the temperature stays the same.

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Answer:

The dynamo has a wheel that touches the back tyre. As the bicycle moves, the wheel turns a magnet inside a coil. This induces enough electricity to run the bicycle's lights. The faster the bicycle moves, the greater the induced voltage - and the brighter the lights.

Because of the bicycle's actions, the wheel turns a magnet internal a coil. This induces enough strength to run the bicycle's lighting fixtures. The faster the bicycle movements, the greater the caused voltage - and the brighter the lights.

A trendy dynamo creates an instantaneous modern-day (DC) – a one-directional waft of electrical rate. A bicycle dynamo creates an alternating current (AC), which reverses course from time to time.

A dynamo is a tool normally positioned inside the hub of a motorcycle's wheel that converts the energy generated by means of the wheel spinning to electric power. That energy is then used to run front and rear dynamo lights at the bike, offering constantly-on illumination without the want to change the lighting.

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Answer:

nothing

Explanation:If you ride a bike around the block and return to the exact point where you started, your displacement is zero.

By definition, displacement involves changing an object from its original position. No matter how far or for how long a body moves, if it returns to the position it started from, it has not been displaced at all. This means that the body has zero displacements.

For a vertical spring launcher is attached to the top of a block and a ball is placed in the launcher, the position of the ball will be  behind the box

Generally, the equation for the  conservation of momentum principle  is mathematically given as

(M+m) V1 = M*V2

Therefore, with the ball moving forward we have that; the ball at top it wii be behind the box,

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Answer:

Above and to the left of the spring launcher

Explanation:

The ball would be to the left of the box because the box is moving to the right at a constant speed. And when the ball goes and reaches its maximum height, the box would have passed the ball.

Answer:

Potential

Explanation:

The most accurate term is Electrostatic potential energy

It's named like this because the force between charges or electrons is called electrostatic force .

Answer:

Water scarcity can mean scarcity in availability due to physical shortage, or scarcity in access due to the failure of institutions to ensure a regular supply or due to a lack of adequate infrastructure.

Explanation:

Answer:

384 joule

Explanation:

mass(m) = 1200 kg,velocity(v) = 0.800m/s, Kinetic Energy(KE) = ? We know that, KE = 1/2 m× v×v, = 1/2× 1200×0.800×0.800 = 600× 0.64 = 384 joule

Answer:

Sun is on the other side

Explanation:

Each point along the track of one solar mass star represents the star's surface temperature and luminosity at one time.

A star having a mass equal to the mass of the Sun is called a one-solar mass star.

Its life track shows the luminous intensity as well as the surface temperature.

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Answer:

The photoelectric effect is a phenomenon in which the photoelectrons are emitted from the metal when an incident electromagnetic wave hits the metal. The incident light should have a threshold frequency to meet the work function of the metal

Answer:

See below

Explanation:

Torgue = f * distance    basically ...so if you want to increase torque with same  f   then the distance ( lever arm)  must be increased

To increase the torque applied on a lever without exerting any more force, the length of the lever arm must be increased.

Torque is defined as the rotational analogue of force. It is the product of the applied force and the perpendicular distance.

Here,

A lever is a simple machine composed of a stiff beam and a fulcrum. Both the load and the effort are applied to the beam's ends (input force and output force, respectively).

The location on which the beam pivots is known as the fulcrum. When a force is exerted on one end of a lever, the opposite end of the lever experiences a load.

The expression for the torque acting on a lever arm is given by,

Torque, τ = Length of lever arm x Force applied

τ = L x F

From the equation, it is clear that the torque acting on the lever arm is directly proportional to its length.

τ ∝ L

Therefore, as the length of the lever arm increases, the torque applied also increases.

Hence,

To increase the torque applied on a lever without exerting any more force, the length of the lever arm must be increased.

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Answer:

45 j

Explanation:

At the top, the KE will have been converted to PE

KE = 1/2 mv^2 =PEat-top = 1/2 10 *3^9 = 45 j