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prohojiy [21]
3 years ago
15

The park has added two more cars to the already existing roller coaster. If the park wants to maintain the speed of the roller c

oaster with the addition of the cars, what must it do? A) Increase the height a point A. B) Increase the heights at point A and B. C) Reduce the number of hills and dips in the course. D) Increase the friction between the wheels and the track.
Physics
2 answers:
Colt1911 [192]3 years ago
8 0

Answer:

Decrease the friction between the wheels and the track.

Explanation:

Decrease the friction between the wheels and the track. Friction opposes motion. If the amount of friction is decreased, the speed of the cars should increase.

This answer is for the question on usa testprep

vredina [299]3 years ago
7 0
D because friction will slow it down going up hills (for safety reasons) and you go really fast going down.
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If a transformer has 50 turns in the primary winding and 10 turns on the secondary winding, what is the reflected resistance in
Elza [17]

Answer:

The reflected resistance in the primary winding is 6250 Ω

Explanation:

Given;

number of turns in the primary winding, N_P = 50 turns

number of turns in the secondary winding, N_S = 10 turns

the secondary load resistance, R_S = 250 Ω

Determine the turns ratio;

K = \frac{N_P}{N_S} \\\\K = \frac{50}{10} \\\\K = 5

Now, determine the reflected resistance in the primary winding;

\frac{R_P}{R_S} = K^2\\\\R_P = R_SK^2\\\\R_P = 250(5)^2\\\\R_P = 6250 \ Ohms

Therefore, the reflected resistance in the primary winding is 6250 Ω

6 0
3 years ago
Once out in space, the space shuttle needs to ________________ to keep going in the same direction at the same speed.
MissTica
Accelerate.
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3 0
4 years ago
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If the resistance in a circuit remains constant, what happens to the electric power when the current increases?
Elena L [17]
V=IR (voltage equals current<span> times </span>resistance<span>). So </span>if<span> the voltage </span>increases<span>, then the </span>current increases<span> provided that the </span>resistance remains constant<span>.</span>
4 0
3 years ago
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Ferns that eject spores generally do so in pairs, with two spores flying off in opposite directions. The structure from which th
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Answer:

It cancels recoil.

Explanation:

For each action there is an equal an opposite reaction.

The principle of conservation of momentum tell us that if a single spore were ejected the fern would suffer a recoil from it. This recoil would take energy and speed from the spore. But if they are ejected in pairs the recoil is canceled and all the energy is transferred to the spores resulting in higher speeds.

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4 years ago
3) A 900N mountain climber scales a 100m cliff. How much work is done by the mountain climber?
Y_Kistochka [10]

Answer:

90 kJ

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W = (900 N) (100 m)

W = 90,000 J

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3 years ago
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