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3 years ago

In an electric motor, periodically changing the electromagnet can cause the axle to spin because

2 answers:

5 0

We want to know why does the axle spin in the electric motor. When we periodically change the electromagnet via alternate current, the magnetic field reverses directions which creates a force on the axle and so the axle starts spinning. So the correct answer is d. the magnetic field reverses direction.

amm18123 years ago

4 0

The answers are,

B
B
D
D

Hope I helped!

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What is the Orbital Notation for Radon

balu736 [363]

I uploaded the answer to a file hosting. Here's link:

tinyurl.com/wpazsebu

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3 years ago

A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground.

Marianna [84]

Answer:

Part a)

Final speed of the corn is 19.05 m/s

Part b)

Kinetic energy of the corn is 3.1 J

Explanation:

Part a)

As we know that the initial position of the corn is

h = 18.5 m

now we also know that it will fall from rest and moving under constant acceleration so we will have

$v_f^2 - v_i^2 = 2 a d$

$v_f^2 - 0 = 2(9.81)(18.5)$

$v_f = 19.05 m/s$

Part b)

Kinetic energy of the corn is given as

$K = \frac{1}{2}mv^2$

$K = \frac{1}{2}(0.017)(19.05)^2$

$K = 3.1 J$

4 0

4 years ago

A 52–newton bird feeder is tied to a cord, which is attached to a tree branch. Describe the tension force of the rope.

ziro4ka [17]

Hi, thank you for posting your question here at Brainly.

When the object is at equilibrium and the object is just freely hanging from the cord, then the summation of forces along the y direction would just be the tension of the cord and the weight of the object. Since both forces are opposite in direction, at equilibrium, they are equal. Hence, in this case, the tension is also equal to 52 N.

3 0

3 years ago

Read 2 more answers

What is the speed of the tip of the hour hand on a clock?

just olya [345]

Explanation: Technically the speed is an inch a second.

7 0

4 years ago

This food chain is incomplete. Two groups of organisms are missing. One group of organisms that is missing are the producers, pl

Katena32 [7]

Answer:

Decomposers that recycle matter back into the food chain.

Explanation:

All dead organisms are food for decomposers. Decomposers that recycle matter back into the food chain.

5 0

3 years ago