Physics Work,Power & Energy Level: High School
Vertical Circle
A pail of water of mass 2.05 kg is rotated in a vertical circle of radius 2.03 m . What is the minimum speed of the pail a the top of the circle if no water is to split out ?1) 2.23013 m / s
2) 19.894 m / s
3) 8.92054 m / s
4) 6.30777 m / s
5) 4.46027 m / s
Physics Work,Power & Energy Level: High School
Circular Motion
A 5.38 kg block is released from A at height 4.02 m on a frictionless track shown in the figure at “click here” . Determine the magnitude of the acceleration for the block at P . Answer in units of m / s^2 .
Physics Work,Power & Energy Level: High School
The unit of work is ?a) kg m/s^2
b) kg m/s
c) kg m^2/s
d) kg m^2/s^2
= kg m/s^2 x m = kgm^2/s^2
Physics Work,Power & Energy Level: High School
Vertical Circle
A rubber stopper is swung in a vertical circle on the end of a 1.6 m long string . If the string is not to go slack at the top of the swing , what minimum speed for the stopper is needed at the top of the swing ?
Physics Work,Power & Energy Level: High School
Calculate the number of joules of kinetic energy at 1-kg book has when tossed across the room at speed of 2 m/s ?
Physics Work,Power & Energy Level: High School
Conservation of Energy
You are driving an ordinary , gasoline-powered car on a level road . You stop by applying the brakes . Energy has not been created or destroyed ; what has become of the car’s kinetic energy ?Physics Work,Power & Energy Level: High School
Collision
A 0.410 kg block of wood hangs from the ceiling by a string , and a 0.0700 kg wad of putty is thrown straight upward , striking the bottom of the block with a speed of 6.50 m/s . The wad of putty sticks to the block .a) Is the mechanical energy of this system conserved ?
b) How high does the putty-block system rise above the original position of the block ?
Physics Work,Power & Energy Level: High School
Collision
A 809 kg car stopped at an intersection is rear-ended by a 1540 kg truck moving with a speed of 17.5 m/s . If the car was in neutral and its brakes were off , so that the collision is approximately elastic , find the final speed of both vehicles after the collision .
Physics Work,Power & Energy Level: High School
Collision
A car moving with an initial speed v collides with a second stationary car that is 3/5 as massive . After the collision the first car moves in the same direction as before with a speed v/4 .a) Find the final speed of the second car .
b) Is this collision elastic or inelastic ?
Physics Work,Power & Energy Level: High School
Inelastic Collision
If objects A and B (see the figure at “click here”) collide and remain in constant , determine resultant velocity , Neglect friction .
Physics Work,Power & Energy Level: High School
Using a lever and fulcrum , a worker lifts a weight of 1000 lb a height of 4 in . Determine the work done . What force did this person apply if his end of the lever traveled 3.5 ft ?
Physics Work,Power & Energy Level: High School
A 90 kg cyclist rides up a long hill with a averagegrade of 8% ( gains 8-m of elevation for 100-m of distance ridden .) His average speed during the climb is 8.5 km/hr . When at the summit , the cyclist has gained 529 kJ of potential energy . How high is the hill in meters ?
Physics Work,Power & Energy Level: High School
A slingshot consist of a light leather cup containing a stone . The cup is pulled back against two parallel rubber bands . It takes a force of 15 N stretch either one of these bands 1.0 cma) What is the potential energy stored in the two bands together when a 50 g stone is placed in the cup and pulled back 0.20 m from the equilibrium position ?
b) With what speed does the stone leave the slingshot ?
Physics Work,Power & Energy Level: High School
. A heavy truck and a small truck , (lighter ) roll down a hill . Neglecting the friction , at the bottom of the hill , the heavy truck will have greater ?Physics Work,Power & Energy Level: High School
A package sitting on a shelf 2m high is knocked off , calculate the velocity of the box when it hits the floor , using a displacement / velocity / acceleration equation and conservation of energy .