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Q. While rummaging in her backpack for her cell phone, Sally's Mini-Cooper rear ends Joey's Suburban. Sally's car is totaled while the suburban is fine. If Sally's car hit the suburban with 30 N of force, how much force did Joey's car exert on Sally's? (a) more than 30 N, (b) less than 30 N, (c) exactly 30 N.
Ans.
Exactly 30 N, Newton's 3rd Law
An electron in a hydrogen atom makes a transition from E 3 to E 1 . How much energy does the atom lose?
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Q. If an object isn't moving, no external force acts on it. No it is always not true, there would be balanced forces which cancel each other out leaving no net force. Example:
A car is moving along a straight horizontal road at a speed of 20 meters per second. The brakes are applied and a constant force of 5000 Newtons decelerates the car to a stop in 1
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Evaluate the speed of the block A 2.00-kg block is attached to a spring force constant 500N/n. The block is pulled 5.00 cm to the right of the equilibrium and released from rest
TA=300 TB=400 rA= rA=6.3(10)^12
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