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1. A 15kg block of wood is at the top of the table. What is the normal force exerted by the table on the block?
a. 741N c. 1.53N
b. 147N d. 24.8N
Suppose that the net external force
(push minus friction) exerted on a
lawnmower is 51 N (about 11 lb)
parallel to the ground. The mass of
the mower is 24 kg. What is its
acceleration?
An ocean dwelling dinosaur has an estimated body volume of 1.38 x 106 cm3 and a mass of 1.24 x 106 g. What is its
density?
1. Which ball was the most efficient? What characteristics does that ball have that you think
helped it be efficient?
2. Why is it impossible for a ball to be 100% efficient?
3. How did the GPE change with height?
4. What percentage of the initial potential energy was ‘wasted’ as the ball was hitting the
ground?
A vehicle drives west at a constant speed of 32 m/s, for 3.8 m. The vehicle then slams on the brakes and slows to a speed of 20.0 m/s with an acceleration of 4.0m/s2. After breaking the car then continues on for 5.0s at a constant speed until it breaks again for 2.0s until it stops. What is the total displacement of the vehicle?
Calculate the acceleration of josh riding his bicycle in a straight line that speeds up from 4m/s to 6m/s in 5 seconds
A ball of mass 0.25kg loses one-third of it's velocity when it makes a head on collision with an identical ball W at rest. After the collision , Q moves off with a speed of 2ms-1in original direction of P . Calculate the initial velocity of P
discuss the consequences of poor health and safety when using ionising and non-ionising radiation
A heart engine takes in 320 j of energy from a hot reservoir and performs 25.0 J of work in each cycle.find
(I). The efficiency of the engine and
(ii). The energy expelled to the cold reservoir in each cycle.
The power rating of a water pump is 4200 watts, if it is run for 600s, how many joules of work will it do in that time?
