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3 years ago

Which of these devices does NOT contain a magnet or electromagnet?

Physics

2 answers:

Black_prince [1.1K]3 years ago

7 0

I think it is D a light bulb

andrey2020 [161]3 years ago

3 0

The answer is D.
A lightbulb has no magnet or electromagnet.

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If energy is continually added to a gas, what will it likely become?

tamaranim1 [39]

The gas will remain a gas and the energy will be transformed into heat raising the temperature
(Some very rare exceptions might occur)

5 0

3 years ago

On the surface of Earth, the force of gravity acting on one kilogram is: *

Murrr4er [49]

Your answer would be:

Option (B) : 2.2 Pounds

Anyways stan LOONA

4 0

3 years ago

A small glider is placed against a compressed spring at the bottom of an air track that slopes upward at an angle of 39.0 ∘ abov

zvonat [6]

Answer:

kinetic energy of glider = -0.376 j

Explanation:

Original distance by which the spring is compressed can be determine by using law of conservation of energy (As spring slide from glider, it gain some potential energy. On the top of track there is glider’s potential energy exist)

$\frac{1}{2} kx^2 = mgh$

where x is compressed distance by spring

height of track is calculated as

$sin\theta \frac{h}{l}$

$h = l sin\theta$

where l is distance covered by glider, theta angle is the angle of inclination of track

therefore, we have formula for x as

$x = \sqrt{\frac{2mglsin\theta}{k}}$

$x = \sqrt{\frac{2\times 0.05 \times 9.8 \times 1.50\times sin39}{600}}$

x = 0.039 m

kinetic energy of glider = potential energy by spring - potential energy at 1.50 distance

$=( \frac{1}{2} \times 600\times 0.039^2) - (0.05 \times 9.8 \times 1.5 \times sin 39)$

kinetic energy of glider = -0.376 j

8 0

4 years ago

A cycle travels along a circular track of diameter 42 m. Calculate the distance travelled and the displacement of the cycle in (

DENIUS [597]

Answer:

(a) i) The distance travelled by the cycle in half round is approximately 65.97 m

ii) The displacement is 42 m

(b) (i) The distance travelled in one round is approximately 131.95 m

(ii) The displacement of the cycle in one round is 0

Explanation:

The diameter of the track through which the cycle travels, D = 42 m

(a) i) Half round is the motion of half the length of the circular path

The distance travelled by the cycle in half round = The length of half the circular track = (1/2) × π × D

∴ The distance travelled by the cycle in half round = (1/2) × π × 42 m = 21·π m ≈ 65.97 m

ii) The displacement half round = The change in the location of the cycle = The difference between the start and stop locations of the cycle on a straight line after half round

The angle at the center of the circular path the cycle turns in half round = 180°

Therefore, the path between the start and stop location of the cycle in half round = The diameter of the circular track

The displacement of the cycle in half round = The diameter of the circular track = 42 m

(b) (i) The distance travelled in one round = The perimeter of the circular track = π·D

∴ The distance travelled in one round = π × 42 m ≈ 131.95 m

(ii) The displacement of the cycle in one round = The change in the location of the cycle

The start and stop location of the cycle after moving one round is the same, therefore, there is no change in the location of the cycle.

Therefore we have;

The displacement of the cycle in one round = 0 (no change in location of the cycle)

7 0

3 years ago

Five race cars speed toward the finish line at the Jasper County Speedway. The table lists each car’s speed in meters/second. If

nekit [7.7K]

We have: v = d/t
From the expression, we conclude speed is indirectly proportional to speed.
So, the car which will take longer time must have the smallest speed. Among all the options Car C has the smallest speed. So, it would be your answer.

In short, Your Answer would be Option C) Car C will take longer time than any other.

Hope this helps!

6 0

3 years ago

Read 2 more answers