The three blocks shown are released from rest and are observed to move with accelerations that have a magnitude of 1.5 m/s2. What is the magnitude of the friction force on the block that slides horizontally? Disregard any pulley mass or friction in the pulley and let M = 2.0 kg
a.
6.0 N
b.
5.1 N
c.
5.5 N
d.
4.6 N
e.
3.7 N
d
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Each of the following lists two statements. Which two are the basic premises for the special theory of relativity?
A) 1. The laws of nature are the same for everyone. 2. The speed of light is the same for everyone. B) 1. Everything is relative. 2. You can never really tell who is moving. C) 1. You can't go faster than the speed of light. 2. Time is different for different people. D) 1. The laws of nature are the same for everyone. 2. Everything is relative. E) 1. The speed of light is the same for everyone. 2. You can't go faster than the speed of light.
When you ride your scooter you have momentum. When you ride twice as fast you have
A) almost twice the momentum. B) twice the momentum. C) four times the momentum. D) none of the above
If the sum of the external forces on an object is zero, then the sum of the external torques on it must also be zero
A) True B) False
All objects made from metals have a much smaller cost when the metal comes from recycled material rather than ore
What will be an ideal response?