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notka56 [123]
3 years ago
6

True or false? In the early 1700s there was a great need to organize the elements.

Physics
1 answer:
USPshnik [31]3 years ago
8 0
True
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Which sentence is a correct statement of Newton's second law?
erma4kov [3.2K]

Answer:

B. A object in motion stays in motion, and an object at rest stays at rest unless acted upon by a net force.

4 0
3 years ago
a tennis ball is hit upward with a tennis racket an initial velocity of 12 m/s. What will the ball's speed be when it returns to
zaharov [31]

Answer: 12 m/s

Explanation:

If we ignore air resistance, gravity alone will reduce the upward velocity to zero at the top of the flight. As gravity is a conservative force, it will return exactly the same amount of energy to the tennis ball when it returns to the original elevation.

7 0
3 years ago
Relativistic kinetic energy is conserved in all reference frames. True O False
Free_Kalibri [48]

Answer:

i think it is true

Explanation:

7 0
3 years ago
A ball of mass 45kg thrown upward with a velocity of 40m/s
AnnyKZ [126]
1) KE=1/2*m*v^2
1/2*45*40^2
KE=36,000J

2) PE=mgh
45*9.81*30
PE=13243.5J
4 0
3 years ago
A 40 kg bear slides, from rest, 14 m down a lodgepole pine tree, moving with a speed of 3.7 m/s just before hitting the ground.
antiseptic1488 [7]

Answer:

A. -5488J

B. 273.8J

C. 372.44N

Explanation:

Given:

m = 40kg

h = 14 m

v= 3.7 m/s

Part(a)

The change in the potential energy of the bear Earth system during the slide

AU = -mgh = -40(9.8) (14) = -5488 J

Part(b)

The kinetic energy of the bear just before hitting the ground is

Ks 1/2 mV^2= (40)(3.7)2 = 547.6 /2 = 273.8J

Part(c)

The change in the thermal energy of the system due to friction is

AEth = fxh=-(AK +AU) = 5488– 273.8 = 5214.2 J

The average frictional force that acts on the sliding bear is

F = Eth / 14= 5214.2/14 =372.44N

4 0
3 years ago
Read 2 more answers
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