Explain any 3 alternating ways of producing electricity

C

maksim [4K]

Answer:

b

Explanation:

a,f,,and g is correct because it is indicated that object moving forward

4 0

3 years ago

The mass of the basketball shown below is 4 times the mass of the baseball.

igomit [66]

Answer:

<h3>40.0 Joules. None of the answers is correct</h3>

Explanation:

Kinetic energy of an object is expressed as;

KE = 1/2mv² where;

m is the mass of the object

V is the velocity of the object.

Let Ma be the mass of the basketball and Mb be the mass of baseball.

If the mass of the basketball shown below is 4 times the mass of the baseball, then Ma = 4Mb

KE of the basket ball = 1/2MaVa²

Va² = 2(KE)a/Ma ...... 1

KE of the baseball = 1/2MbVb²

Vb² = 2(KE)b/Mb .......... 2

Since their velocities are the same, hence Va²= Vb²

2(KE)a/Ma = 2(KE)b/Mb

Substituting Ma = 4Mb into the resulting expression.

2(KE)a/4Mb = 2(KE)b/Mb

2(KE)a/4 = 2(KE)b

Given Kinetic energy of baseball (KE)b = 10.0J, the expression becomes;

2(KE)a/4 = 2(10)

2(KE)a = 4*20

2(KE)a = 80

(KE)a = 80/2

(KE)a = 40.0J

Hence the kinetic energy of the basketball is 40.0Joules

8 0

3 years ago

Which object has the greatest kinetic energy?

VLD [36.1K]

Answer:

D

Explanation:

7 0

2 years ago

A man stands on the roof of a building of height 17.0 m and throws a rock with a velocity of magnitude 33.0 m/s at an angle of 3

arlik [135]

Answer:

(A). The maximum height above the roof reached by the rock is 16.48 m.

(B). The velocity of the rock before hitting the ground is 37.6 m/s.

(C). The horizontal distance from the base of the building to the point where the rock strikes the ground is 122.7 m.

Explanation:

Given that,

Height = 17.0 m

Velocity = 33.0 m/s

Angle = 33.0°

(A). We need to calculate the maximum height above the roof reached by the rock

Using formula of height

$h=\dfrac{v^2}{2g}$

$h=\dfrac{(v_{0}\sin\theta)^2}{2g}$

Put the value into the formula

$h=\dfrac{(33\times\sin33)^2}{2\times9.8}$

$h=16.48\ m$

(B). We need to calculate the time

Using equation of motion

$-h=v_{y}t-\dfrac{1}{2}gt^2$

Put the value into the formula

$-17.0=(v_{0}\sin\theta)t-4.9t^2$

$-17.0=(33.0\times\sin33)t-4.9t^2$

$4.9t^2-17.9t-17.0$

$t = 4.435\ sec$

We need to calculate the magnitude of the velocity of the rock just before it strikes the ground

Using equation of motion

$v_{y}=v_{0}\sin\theta-gt$

$v_{y}=(33.0\times\sin33)-9.8\times4.435$

$v_{y}=-25.48\ m/s$

The velocity of the rock before hitting the ground is

$v=\sqrt{v_{x}^2+v_{y}^2}$

$v=\sqrt{(v_{0}\cos\theta)^2+v_{y}^2}$

$v=\sqrt{(33\cos33)^2+(-25.48)^2}$

$v=37.6\ m/s$

(C). We need to calculate the horizontal distance from the base of the building to the point where the rock strikes the ground

Using equation of motion

$R=v_{x}\times t$

$R=v_{0}\cos\theta\times t$

Put the value into the formula

$R=33\times\cos33\times4.435$

$R=122.7\ m$

Hence, (A). The maximum height above the roof reached by the rock is 16.48 m.

(B). The velocity of the rock before hitting the ground is 37.6 m/s.

(C). The horizontal distance from the base of the building to the point where the rock strikes the ground is 122.7 m.

4 0

4 years ago

A skier is pulled by a tow rope up a frictionless ski slope that makes an angle of 17° with the horizontal. The rope moves paral

pishuonlain [190]

Answer:

(a) 950J

(b) 216 W

(c) 316.67 W

Explanation:

(a) If the skier is moving at a constant speed, then his kinetic energy is unchanged. The work done by the rope is the same for speed at 2.2m/s as it is for 1.5m/s. It is 950J

(b) When the speed is 1.5m/s then the time it would take to move up a distance of 6.6 m is 6.6 / 1.5 = 4.4 s

If the work is 950J over 4.4s then the rate of work is 950 / 4.4 = 216 W

(c) When the speed is 2.2 m/s then the time it would take to move up a distance of 6.6 m is 6.6 / 2.2 = 3 s. If the work is 950J over 3s then the rate of work is 950 / 3 = 316.67 W

7 0

3 years ago

Read 2 more answers

Explain any 3 alternating ways of producing electricity​

Explain any 3 alternating ways of producing electricity