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MissTica
3 years ago
13

Identify two ways in which friction is not useful in science​

Physics
1 answer:
kiruha [24]3 years ago
8 0

Answer:

  • Friction between brakes and the wheels of a car or bicycle helps the vehicles slow down.
  • If you do not lubricate your bike regularly with oil, the friction in the chain and axles increases.
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A 3kg box has 45J of gravitational potential energy, how high is it off the ground?
frez [133]

Answer:

1.53m

Explanation:

Given parameters:

Mass of box  = 3kg

Gravitational potential energy  = 45J

Unknown

Height of the box  = ?

Solution:

To solve this problem;

 Gravitational potential energy = mgh

m is the mass

g is the acceleration due to gravity

h is the height

            45  = 3 x 9.8 x h

            h  = 1.53m

7 0
2 years ago
A jewellery melts 500g of Silver to pour into a mould. Calculate how much energy was released as the silver solidified.
irga5000 [103]

When silver is poured into the mould the it will solidify

In this process the phase of the Silver block will change from liquid to solid.

This phase change will lead to release in heat and this heat is known as latent heat of fusion.

The formula to find the latent heat of fusion is given as

Q = mL

here given that

m = mass = 500 g

L = 111 kJ/kg

now we can find the heat released

Q = 0.5 * 111 kJ

Q = 55.5 kJ

So it will release total heat of 55.5 kJ when it will solidify

8 0
3 years ago
A person is initially driving a car east down a straight road. the magnitude of the instantaneous acceleration is decreasing wit
Alexxandr [17]
By definition, acceleration is the change in velocity per change of time. As time passes by, the time increases in value. So, when the acceleration is decreasing while the time is increasing, then that means that the change of velocity is also decreasing with time. So, optimally, the initial velocity and the velocity at any time are very relatively close to each other,
4 0
3 years ago
Read 2 more answers
How much heat is required to raise the temperature of 100 g of water from 5 degree celsius to 90 degree celsius?​
Scorpion4ik [409]

Explanation:

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2 years ago
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Jsisisusuagahannananana this is worth 22 points g that’s crazy 25
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