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3 years ago

Differentiate between rest and motion.

Physics

1 answer:

Lyrx [107]3 years ago

8 0

Answer:

1. A body is said to be at rest if its position does not change with respect to its surroundings.

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A 3kg ball moving at 8 m/s strikes a 2kg ball at rest,if the collision is elastic,what is the speed of the lighter ball if the h

zloy xaker [14]

Answer:

Speed of lighter ball is 4 m/s.

Explanation:

Applying the principle of conservation of linear momentum,

momentum before collision = momentum after collision.

$m_{1}$ $u_{1}$ + $m_{2}$ $u_{2}$ = $m_{1}$ $v_{1}$ - $m_{2}$ $v_{2}$

$m_{1}$ = 3 kg, $u_{1}$ = 8 m/s, $m_{2}$ = 2 kg, $u_{2}$ = 0 m/s ( since it is at rest), $v_{1}$ = 2 m/s, $v_{2}$ = ?

(3 x 8) + (2 x 0) = (8 x 2) - (2 x $v_{2}$ )

24 + 0 = 16 - 2 $v_{2}$

2 $v_{2}$ = 16 - 24

2 $v_{2}$ = -8

$v_{2}$ = $\frac{-8}{2}$

= -4 m/s

This implies that the light ball moves at the speed of 4 m/s in the opposite direction of the heavier ball after collision.

7 0

2 years ago

What is projectile motion is caused by?

olga55 [171]

A projectile is any object that is thrown, dropped or otherwise laughed into the air.
1) If it is dropped - it's motion is caused by just gravitation force
2) if it is thrown - it's motion is caused by gravitation force + force you applied to though it upwards

8 0

3 years ago

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Suppose the kicker launches the ball at 60∘ instead of 30∘. Assuming that the goal is 4.55 m high and 40 m away, what minimum in

Nikitich [7]

Answer:22 m/s

Explanation:

Given

launch angle $\theta =60^{\circ}$

height of goal $h=4.55\ m$

and horizontal distance $x=40\ m$

Suppose initial speed is $u$

Trajectory of a Projectile is given by

$y=x\tan \theta -\frac{1}{2}\frac{gx^2}{u^2\cos ^2\theta }$

substituting the values we get

$4.55=40\tan (60)-0.5\times \frac{9.8\times (40)^2}{u^2\cdot \cos ^260 }$

$4.55=69.28-0.5\times \frac{15,680}{u^2\cdot 0.25}$

$\frac{31,360}{u^2}=69.28-4.55$

$\frac{31,360}{64.73}=u^2$

$u^2=484.47$

$u=22.01\ m/s$

So, initial launch speed is $22\ m/s$

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3 years ago

a speeder traveling at a constant speed of 125 km/h races past a billboard. a patrol car pursues from rest with constant acceler

Alinara [238K]

Answer:

ajdjbdsbakalaksb

Explanation:

bdjsjdbsbßsna

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2 years ago

Juan makes an adjustment to an electromagnet that causes the electromagnet to lose some of its strength. What did Juan most like

vampirchik [111]

A: He reduced the number of loops in the wire.

Explanation: The fewer coils of solenoid there are around the magnet, the weaker the electromagnet is. FYI: The solenoid is the wire in the electromagnet.

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3 years ago

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