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3 years ago

Does frictional force increase or decrease based on velocity?

Physics

1 answer:

leonid [27]3 years ago

3 0

Explanation:

Many would know it as a reaction force. Reaction force is the force by the surface on the object perpendicular to it's motion. So if we apply force on the sliding block perpendicular to it's direction of motion, friction will increase. ... That force is proportional to the velocity with which it is moving.

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Calculate the kinetic energy in joules of a 10g bullet moving at 300 m/s

mina [271]

Given: Mass m= 10 g convert to Kg m = 0.01 Kg Velocity V = 300 m/s

Required: Kinetic energy = K.E = 1/2 mV²

K.E = 1/2 (0.01 Kg)(300 m/s)²

K.E = 450 J

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4 years ago

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A boy held a ball in the air what force is he applying?

Delvig [45]

Answer:

strength

Explanation:

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3 years ago

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If an object has a kinetic energy of 30 j and mass of 34kg how fast is the object moving ?

Murrr4er [49]

Ek = (m*V^2) / 2 where m is mass and V is speed, then we can take this equation and manipulate it a little to isolate the speed.

Ek = mv^2 / 2 — multiply both sides by 2

2Ek = mv^2 — divide both sides by m

2Ek / m = V^2 — switch sides

V^2 = 2Ek / m — plug in values

V^2 = 2*30J / 34kg

V^2 = 60J/34kg

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V = sqrt(1.76)

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3 years ago

Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest a

Tomtit [17]

Answer:

b. it has the same centripetal acceleration as car A.

Explanation:

According to the question, the data provided is as follows

Constant speed of car A = 20 m/s

Constant tangential acceleration until its speed is 40 m/s

Based on the above information, the true statement is the same centripetal acceleration as car A because

As we know that

Centripetal acceleration is

$= \frac{V^2}{r}$

where,

$V^2$ = velocity

r = radius of the path

Now if both car A and car B moving in the same or identical circular path having the same velocity so in this case there is the same centripetal acceleration for that particular time

hence, the second option is correct

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4 years ago

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marusya05 [52]

That completely depends on your speed and the trajectory (path) you choose.

The Apollo missions took about 3 days each way.

The New Horizons spacecraft passed the moon within a couple of hours after it was launched.

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