All categories

3 years ago

What is the SI unit of energy

Physics

1 answer:

Anettt [7]3 years ago

5 0

The SI unit of energy is joule(J). Hope this helps!

You might be interested in

What is acceleration?

Kisachek [45]

Acceleration is the force of something moving, or acceleration can be how fast an object is going!

7 0

2 years ago

Read 2 more answers

During a workout, the football players at State U ran up the stadium stairs in 61 s. The stairs are 130 m long and inclined at a

NeTakaya

Answer:

P = 1097 Watt

Explanation:

given,

length of stairs, L = 130 m

inclination with horizontal,θ = 30°

mass of the football player = 105 Kg

time = 61 s

we know,

$Power = \dfrac{work}{time}$

Work = change in Potential energy

h = L sin 30°

h = 130 x 0.5

h = 65 m

W = m g h

W = 105 x 9.8 x 65

W = 66885 J

now,

$P = \dfrac{66885}{61}$

P = 1097 Watt

hence, the power output on the way is 1097 W

5 0

2 years ago

An aluminum "12 gauge" wire has a diameter d of 0.205 centimeters. The resistivity ρ of aluminum is 2.75×10−8 ohm-meters. The el

Alborosie

Answer:

I = 4.75 A

Explanation:

To find the current in the wire you use the following relation:

$J=\frac{E}{\rho}$ (1)

E: electric field E(t)=0.0004t2−0.0001t+0.0004

ρ: resistivity of the material = 2.75×10−8 ohm-meters

J: current density

The current density is also given by:

$J=\frac{I}{A}$ (2)

I: current

A: cross area of the wire = π(d/2)^2

d: diameter of the wire = 0.205 cm = 0.00205 m

You replace the equation (2) into the equation (1), and you solve for the current I:

$\frac{I}{A}=\frac{E(t)}{\rho}\\\\I(t)=\frac{AE(t)}{\rho}$

Next, you replace for all variables:

$I(t)=\frac{\pi (d/2)^2E(t)}{\rho}\\\\I(t)=\frac{\pi(0.00205m/2)^2(0.0004t^2-0.0001t+0.0004)}{2.75*10^{-8}\Omega.m}\\\\I(t)=4.75A$

hence, the current in the wire is 4.75A

4 0

2 years ago

You have two golf balls that differ only in their surfaces. one has dimples, while the other is smooth. if you were to drop the

il63 [147K]

Answer: the golf ball with smooth surface would hit the ground first.

Jusitification:

An analysis of forces show two vertical forces acting on the golf balls.

1) one force is the weight (mg) which is vertical downward

2) the other force is the drag force exerted by the air on the golf balls, and it is vertical upward.

3) the drag force opposes the weight, so the acceleration downward is determined by the difference of the weiight and the drag force, until the balls reach the terminal speed (when the drag force equals the weight).

4) the drag force depends on the shape and area of the object falling. Being the surface of one ball smooth implies that the drag force will be less than the one on the other ball.

5) less drag force implies that the terminal velocity of the smooth ball will he higher, ant then it will hit the ground first.

3 0

2 years ago

A particle of mass.25 kg is moving with a speed of 7m/s due north.find it's kinetic energy.<br>

Ivenika [448]

Answer:

Explanation:

612J

3 0

2 years ago