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2 years ago

What are two ways in which friction can be useful?

Physics

2 answers:

pishuonlain [190]2 years ago

6 0

If something is going down a hill it can help slow it down

it can stop you from flying off a rollercoaster

Katena32 [7]2 years ago

5 0

Friction slows an object down. the brakes in your car are a good example of friction.

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If my mass is 105 kilograms; what is my weight on Earth?

lyudmila [28]

Answer:

1029N

Explanation:

use W =mg and get answer

6 0

2 years ago

What element exists in almost every compound in your body and other living things

Aleks [24]

Carbon is one of the main building blocks of life. This is what carbon dating is so effective, because scientists are able to tell the approximate age of something that was once alive given how much carbon is still in the animal.
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2 years ago

The MSDS for glacial acetic acid says that it is a flammable liquid that can severely burn any human tissue it comes in contact

Alex777 [14]

Answer: D) It should be handled in a fume hood, away from open flames.

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2 years ago

If a moving car speeds up until it is going twice as fast, how much kinetic energy doe s it have compared with its initial kinet

dezoksy [38]

The kinetic energy of an object of mass m and velocity v is given by
$K= \frac{1}{2} mv^2$

Let's call $v_i$ the initial speed of the car, so that its initial kinetic energy is
$K_i = \frac{1}{2} mv_i^2$
where m is the mass of the car.

The problem says that the car speeds up until its velocity is twice the original one, so
$v_f = 2 v_i$
and by using the new velocity we can calculate the final kinetic energy of the car
$K_f = \frac{1}{2} mv_f^2 = \frac{1}{2}m (2 v_i)^2 = 4 ( \frac{1}{2} mv_i^2)=4 K_i$
so, if the velocity of the car is doubled, the new kinetic energy is 4 times the initial kinetic energy.

6 0

2 years ago

The current in a lamp is 0.5 ampere when it is plugged into a standard wall outlet. What is the resistance of the lamp when it i

lidiya [134]

The resistance of the lamp plugged in to a standard wall outlet with a current of 0.5 amps is 240 Ω (ohms)

Explanation:

In the United States Of America the standard voltage is 120 v and their frequency is 60 Hz

Standard wall outlet voltage is 120 V

The current in the lamp is 0.5 ampere

Resistance (R) = V/ I

= 120/0.5

= 240Ω (ohms)

Thus the resistance of the lamp plugged in to a standard wall outlet with a current of 0.5 amps is 240 Ω (ohms).

8 0

3 years ago