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melisa1 [442]
3 years ago
12

What is an electromagnet? A. a solenoid with a ferromagnetic core B. a magnet that's electrically pulsed C. a solenoid with no c

ore D. All of the above E. none of the above
Physics
1 answer:
Nina [5.8K]3 years ago
3 0
D because not one of the has one of the things tha it can show

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Determine the stopping location of the prize wheel. At this moment it is centered on the number 11. It is spinning at a rate of
Goshia [24]

Answer:

The wheel spins for 11.43s. The number cannot be determined.

Explanation:

We know that initial velocity is 124.4 rpm = 13.027137522 rad/s, acceleration is -1.14 rad/s^2, and final velocity is assumed to be 0 rad/s. We are asked to find t and displacement. We use the equation \omega=\omega_0+\alpha t where \omega=0 rad/s, \omega_0=13.027 rad/s, \alpha=-1.14rad/s^2, and t=?.

Rearrange the equation to obtain \frac{\omega-\omega_0}{\alpha}=t. Plug in the numbers and solve to obtain t=11.43s.

The number of the wheel cannot be determined as we do not know the placement of numbers on the wheel.

5 0
3 years ago
When a ball is thrown up vertically, explain what happens and explain why final velocity is zero ​
ipn [44]

Answer:

As you throw the ball up into the air, its direction is up, but the speed decreases due to the pull of gravity. The ball slows down, and at the very top of its flight, its velocity at that instant is zero.

3 0
3 years ago
A 4-kg hammer is lifted to a height of 10 m and dropped from rest. What was the velocity (in m/s) of the hammer when it was at a
ipn [44]

Answer:

v = 10.84 m/s

Explanation:

using the equation of motion:

v^2 = (v0)^2 + 2×a(r - r0)

<em>due to the hammer starting from rest, vo = 0 m/s and a = g , g is the gravitational acceleration.</em>

v^2 = 2×g(r - r0)

v = \sqrt{2×(-9.8)×(4 - 10)}

  = 10.84 m/s

therefore, the velocity at r = 4 meters is 10.84 m/s

4 0
2 years ago
Calculate the amount of air in a room 6m long, 5m wide and 3mm high.​
sattari [20]

Answer:

0.09kg of air

Explanation:

The dimensions of the room are given

change the height to meters by dividing it by thousand.

For the volume multiplying the length,width and height (all should be in the same unit most suitable being meters).

Volume refers to the amount of space inside a box or a object.

The amount of air is equal to the volume.

6 0
2 years ago
Read 2 more answers
Cassidy Carver's family child care center has an activities table with four chairs an easel that can accommodate a child on each
Akimi4 [234]

Answer:4

Explanation:

6 0
3 years ago
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