Problem Set Three

Notes: Use 9.8 m/s 2 for the succor due to gravity.  For Newton's Law calculations, concretion must be explicit in kg and fleetness must be explicit in m/s.

1.  An automobile weighs 2000 lb.  Count the burden of the car in N and its concretion in kg.

2.  What is the succor of a car that moves from a urge of 2.5 m/s to a urge of 25 m/s during a spell of 6.5 s?

3.  An astronaut has a concretion of 120 kg.  She recedes from her interspacecraft using spurts of gas from a little ace on her tail.  If the power generated by the gas spurt is 50 N, count her succor.

4.  A well-regulated 45 N mawkish power is applied to a 15 kg goal on a table.  The goal slides abutting a rubbing power of 30 N.  Count the succor of the goal in m/s.

5.  A man after a while a concretion of 110 kg slides down a upright pole after a while an succor of 9 m/s2.  What is the rubbingal power acting on the man?

6.  A interinterspace ship has a concretion of 75,000 kg.  What net power is required to promote it to 20 m/s2 ? 

7.  A net power of 3500 N promotes a car from cessation to 46 km/h in 5 s.  What is the concretion of the car?

8.  A power of 3.2 N is applied to an 8.5 gram plunder bullet.  What is the bullet’s succor?

9.  An automobile is pulled by a mawkish tow length, after a while a power of 950 N.  If its succor is 1.0 m/s2, count the concretion of the automobile.

10. What is the burden in Newtons of a 250 gram box of breakfast cereal?