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3 years ago

11

Under most conditions, except ________ change, the resistance of an object is a constant and does not depend on the amount of th

e voltage or the amount of current passing through it.

1 answer:

Readme [11.4K]3 years ago

4 0

Answer:

Temperature change

Explanation:

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A box is being pulled to the right. What is the direction of the gravitational force?

ioda

Answer:

The correct answer would be downwards

Hope this helps have a good day

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3 years ago

Hot air balloon ( look at pic)

kramer

Answer:

I think that the answer is convection.

Explanation:

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3 years ago

A tire sits atop a ramp. When the tire is released, it rolls down the ramp. At the ramp's bottom, the speeding tire knocks down

k0ka [10]

Answer:

mechanical energy

Explanation:

Mechanical energy is the combination of both potential energy and kinetic

Mechanical energy can be divided as

1)kinetic energy, this energy vis regarded as the energy of motion

2) potential energy which is the stored energy of position.

Mechanical energy reffered to as

motion energy this energy is responsible for the movement of an object based on its position as well as motion.

Mechanical energy= U + K

Where U= potential energy

K= Kinectic energy

As the tire is sitting on top of a ramp, it posses "potential energy" as it is released and rolls down the ramp the potential is converted to Kinectic energy

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3 years ago

A motorcyclist drove 7 km at 57km/h and then another 7 km at 81 km/h. What was the average speed?

alex41 [277]

<u>Answer:</u>

<em>The average speed of the car is 66.9 km/h</em>

<u>Explanation:</u>

Here distance covered with the speed <em>57 km/h=7 km </em>

distance covered with the speed of <em>81 km/h=7 km</em>

<em>Average speed is equal to the ratio of total distance to the total time. </em>

<em>total distance= 7 + 7= 14 km </em>

<em> $time= \frac{distance}{speed}$ </em>

<em>time taken to cover the first 7 km= 7/57 h </em>

<em>time taken to cover the second part of the journey = 7/81 h </em>

<em>average speed = $14/(7/57+7/81)=(14 \times 57 \times 81)/945=66.9 km/h$ </em>

<u><em>Shortcut: </em></u>

<em>When equal distances are covered with different speeds average speed=2 ab/(a+b) where a and b are the variable speeds in the phases. </em>

7 0

3 years ago

Given the nuclear equation:

Leokris [45]

This is a nuclear fission reaction, in which a larger nucleus is bombarded with a neutron to make it break down into two smaller nuclei and release energy.

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3 years ago