Physics Work,Power & Energy Level: High School
A tennis player receives a shot with the ball (0.060 kg) traveling horizontally at 50.0 m/s and returns the shot with the ball traveling horizontally at 40.0 m/s in the opposite direction .(a) What is the impulse delivered to the ball by the racquet ?
(b) What work does the racquet do on the ball ?
Physics Work,Power & Energy Level: High School
The diameter of the sun is 13.9 x 10 to the 8th m, and the distance from the Earth to the Sun is 1.5 x 10 to the 11th m . How long does it take for the sun to disappear after it touches the horizon during sunset ? (Ignoring effects due to refraction with in Earth’s atmosphere . )
Physics Work,Power & Energy Level: High School
A block of wood with a mass of 4.65kg is resting on a horizontal surface when a bullet with a mass of 18.0 grams and moving with a peed of 725 meters per second strikes it . The coefficient of friction between the block and the surface is 0.350 . What distance does the block move across the surface? Assume the collision is completely inelastic .
Physics Work,Power & Energy Level: High School
A railroad car is situated on a hill 22 meters above railroad car B , the linear distance between Car A and Car B is 72 meters , Car B is 54 linear meters away from the to of a 12 meter tail hill that goes into a lake . If car A has mass 2750 kg , and Car B has mass 4750 kg , what must car A’s minimum initial speed be such that it collides elastically with car B to knock it into the lake .
Physics Work,Power & Energy Level: High School
The diagram shown at depicts two pucks on a frictionless table. Puck II four times as massive as puck I. starting from rest, the pucks are pushed across the table by two equal forces.
(a) Which puck will have the greater kinetic energy upon reaching the finish line ? Explain
(b) Which puck will reach the finish line first ? Explain.
Physics Work,Power & Energy Level: High School
a) How much energy is required to stop a 3200 lb car traveling at 60 mi/hr ?
b) If this is accomplished in 10 seconds, how much power is expended ?
Physics Work,Power & Energy Level: High School
2 Identical balls with initial velocities V1 = 1.2 m/s and V2 = -.75 m/s collide head on . If the collision is perfectly elastic , what is the final velocity of each ball ?
Physics Work,Power & Energy Level: High School
A ball of mass 2 kg is dropped from a height of 10m. The speed of the ball is measured as 12.5 m/s just before it hits the ground . what was the work done against air friction during this fall ?
Physics Work,Power & Energy Level: High School
A 2.0 kg mass moving to the east at a speed of 4.0 m/s collides head-on in a perfectly inelastic collision with a stationary 2.0 kg mass . How much kinetic energy is lost during this collision ?a) 16 J
b) 4 J
c) 8 J
d) zero
Physics Work,Power & Energy Level: High School
A 3.0 kg object moving 8.0 m/s in the positive x direction has a one-dimensional elastic collision with an object (mass = M) initially at rest . After the collision the object of unknown mass has a velocity of 6.0 m/s in the positive x direction . What is M ?a) 7.5 kg
b) 5.0 kg
c) 6.0 kg
d) 4.2 kg
e) 8.0 kg
Physics Work,Power & Energy Level: High School
A 6 kg object is moving 5.0 m/s collides with and sticks to a 2.0 kg object . After the collision the composite object is moving 2.0 m/s in a direction opposite to the initial direction of motion of the 6.0 kg object . Determine the speed of the 2.0 kg object before the collision .a) 15 m/s
b) 7 m/s
c) 8 m/s
d) 23 m/s
e) 11 m/s
Physics Work,Power & Energy Level: High School
A 4.0 kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall . The particle rebound with a speed of 3.0 m/s . what is the magnitude of the impulse delivered to the particle ?a) 24 N.s
b) 32 N.s
c) 40 N.s
d) 31 N.s
e) 8.0 N.s
Physics Work,Power & Energy Level: High School
A 1.2 kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction . If the object is in contact with the wall for 2.0 ms , what is the magnitude of the average force on the object by the wall ?a) 9.8 kN
b) 8.4 kN
c) 7.7 kN
d) 9.1 kN
e) 1.2 kN
Physics Work,Power & Energy Level: High School
A 3.0 kg mass is dropped from the edge of a 50-m tall building with an initial speed of zero. The mass strikes the ground with a down ward velocity of 25 m/s. how much work is done on the mass by air resistance between the point where it is dropped and the point where it strikes the ground ?a) -0.46 kj
b) -0.53 kj
c) -0.61 kj
d) -0.38 kj
e) -0.81 kj
Physics Work,Power & Energy Level: High School
A particle is acted up on by only two forces, one conservative and one nonconservative as it moves from point A to point B . The kinetic energy of particle at point A and B are equal if .a) The sum of the works of the two forces is zero .
b) the work of the conservative force is equal to the work of the nonconservative force .
c) the work of the conservative force is zero .
d) the work of the nonconservative force is zero .
e) none of the above