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3 years ago

A car driving down a hill contains many types of energy. DESCRIBE at least 3 types of energy the car has.

1 answer:

8 0

Once the car is on top of the hill it contains potential energy witch means it is storing enough energy to slide the hill until acted on. Once the car moves and slides down the hill it creates kinetic energy witch means it's in motion. The car then turns the kinetic energy into mechanical energy witch means it's working. I'm not sure if that helped but good luck!

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A contestants spin a wheel when it is their turn in a game show. One contestant gives the wheel an initial angular speed of 3.40

guajiro [1.7K]

Answer:

4.62 s

Explanation:

We are given that

Initial angular speed, $\omega=3.4 rad/s$

$\theta=1\frac{1}{4} rev=\frac{5}{4}\times 2\pi=2.5\pi rad$

$\omega'=0$

$\omega'^2-\omega^2=2\alpha \theta$

Substitute the values

$0-(3.4)^2=2\times 2.5\pi \alpha$

$\alpha=\frac{-(3.4)^2}{2\times 2.5\pi}=-0.736 rad/s^2$

$\omega'=\omega+\alpha t$

$0=3.4-0.736 t$

$-0.736t=-3.4$

$t=\frac{-3.4}{-0.736}=4.62 s$

Hence, the wheel takes 4.62 s to come to rest.

3 0

3 years ago

A ball is dropped from rest from the top of a cliff that is 24 m high. From ground level, a second ball is thrown straight upwar

sesenic [268]

Answer:

6.0 m below the top of the cliff

Explanation:

We can find the velocity at which the ball dropped from the cliff reaches the ground by using the SUVAT equation

$v^2-u^2 = 2gd$

where

u = 0 (it starts from rest)

g = 9.8 m/s^2 (acceleration of gravity, we assume downward as positive direction)

h = 24 m is the distance covered

Solving for h,

$v=\sqrt{2gh}=\sqrt{2(9.8)(24)}=21.7 m/s$

So the ball thrown upward is launched with this initial velocity:

u = 21.7 m/s

From now on, we take instead upward as positive direction.

The vertical position of the ball dropped from the cliff at time t is

$y_1 = h - \frac{1}{2}gt^2$

While the vertical position of the ball thrown upward is

$y_2 = ut - \frac{1}{2}gt^2$

The two balls meet when

$y_1 = y_2\\h-\frac{1}{2}gt^2 = ut - \frac{1}{2}gt^2 \\h = ut \rightarrow t = \frac{h}{u}=\frac{24}{21.7}=1.11 s$

So the two balls meet after 1.11 s, when the position of the ball dropped from the cliff is

$y_1 = h -\frac{1}{2}gt^2 = 24-\frac{1}{2}(9.8)(1.11)^2=18.0 m$

So the distance below the top of the cliff is

$d=24.0 - 18.0 = 6.0 m$

4 0

3 years ago

A bus is moving with the velocity of 30m/s. Calculate the distance covered by the bus in 15 seconds.

lesya [120]

450 miles
1- 30x15=450

3 0

2 years ago

3. What average net force is required to stop a 7 kg shopping cart in 2 s if it's initially

stiv31 [10]

-12.25N

Explanation:

Given parameters:

Mass of shopping cart = 7kg

Time = 2s

initial velocity = 3.5m/s

Unknown:

Average net force required to stop the cart = ?

Solution;

According to newton's second law"acceleration of body results when a net force acts on a body".

F = ma

where F is the force

m is the mass

a is the acceleration

Acceleration is the change in velocity with time

a = $\frac{v - u}{t}$

Therefore;

F = m x $\frac{v - u}{t}$

v is the final velocity, in this case it is zero, 0

u is the initial velocity

t is the time taken

Putting in the parameters:

F = 7 x $\frac{0- 3.5}{2}$ = -12.25N

This force that will stop the cart will be directed in the opposite direction with a magnitude of 12.25N

Learn more:

Newton's law brainly.com/question/11411375

#learnwithBrainly

8 0

3 years ago

Consider a solenoid that is very long compared with its radius. Of the following choices, what is the most effective way to incr

alex41 [277]

Increasing the coil's number of turns expanding the current. Putting a core made of iron into the solenoid.

(a) Because Bpropto n states that the magnetic field will grow if the number of turns per unit length is increased.

(b) Once more, B=mu 0(H+M)=mu 0(nI+M) is true, with M being the magnetization of the magnetic material. Therefore, the magnetic field will intensify if we place a magnetic substance within the solenoid.. (correct option)

c) because, according to Bpropto I, the magnetic field will increase if we raise the current.. (correct option)

(d) Because Bpropto frac1 L, if we lengthen it but keeping the total number of turns same , the magnetic field will decrease....(option (d) is incorrect)

(e) If we keep the number of turns per unit length constant , the magnetic field will unchanged ....(option (e) is incorrect )

<h3> what is referred by the cross sectional area of a solenoid? </h3>

The way it is wound, or more specifically, the circle, is referred to as the cross section. Circle does not depend on what it has within.

A solenoid is a wire wound in general in a circular shape, even when it is not forced, the cross section refers to the way in which it is wound, in general to the circle and is joined to determine the area A = π r². This circle is the same whether it is in the air, a liquid, or a solid because it is independent of what is inside,

To learn more about solenoid , visit :

brainly.com/question/2204343

#SPJ4

3 0

1 year ago