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3 years ago

What is the net force on a car if the force of friction is 15 N and the forward force due to the engine is 20 N?

1 answer:

6 0

5 newton forward because the force of the engine is greater than the force of friction so that means the car is going forward.
You can think of this: when friction is greater than the force of an object its slowing down but when the force of the car is greater than the force of friction its speeding up.
Hope this helps

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How much work is needed to stop a 1,110 kg car that is moving straight down the

schepotkina [342]

Answer:

382.74 kJ.

Explanation:

The work that must be done to stop an 1100 kg car travelling at 59 km/h is - 382.74 kJ.

3 0

3 years ago

How can a force change the motion of an object that is already moving?

lara [203]

Answer:They may cause motion to change

Explanation:They may cause motion; they may also slow, stop, or change the direction of motion of an object that is already moving. Since force cause changes in the speed or direction of an object, we can say that forces cause changes in velocity. Remember that acceleration is a change in velocity.

7 0

3 years ago

You have a small piece of iron at 25 °C and place it into a large container of water at 75 °C. Which of these could be the tempe

Ivanshal [37]

50 degrees because the would most likely equal out

8 0

3 years ago

What happens when the temperature of a substance is increased?

Amiraneli [1.4K]

When the temperature of a substance is increased, the kinetic energy of the particles of the substance is increased as well.

This can lead to thermal expansion such as an increase in length of the substance or increase in volume of the substance.

This can also lead to change of state of the substance, for example change of state from solid to liquid or from liquid to vapor.

7 0

3 years ago

Alternating Current In Europe, the voltage of the alternating current coming through an electrical outlet can be modeled by the

stealth61 [152]

Answer:

$\frac{50}{\pi }$ Hz

Explanation:

In alternating current (AC) circuits, voltage (V) oscillates in a sine wave pattern and has a general equation as a function of time (t) as follows;

V(t) = V sin (ωt + Ф) -----------------(i)

Where;

V = amplitude value of the voltage

ω = angular frequency = 2 π f [f = cyclic frequency or simply, frequency]

Ф = phase difference between voltage and current.

Now,

From the question,

V(t) = 230 sin (100t) ---------------(ii)

By comparing equations (i) and (ii) the following holds;

V = 230

ω = 100

Ф = 0

But;

ω = 2 π f = 100

2 π f = 100 [divide both sides by 2]

π f = 50

f = $\frac{50}{\pi }$ Hz

Therefore, the frequency of the voltage is $\frac{50}{\pi }$ Hz

7 0

3 years ago