Physics Work,Power & Energy Level: Misc Level
A thin hoop with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 3.5 rad/s. What is its kinetic energy?
a. 0.18 J
b. 0.092 J
c. 1.05 J
Physics Work,Power & Energy Level: Misc Level
A snowboarder coasts on a smooth track that rises from one level to another. If the snowboarder s initial speed is 4 m/s, the snowboarder just makes it to the upper level and comes to rest. With a slightly greater initial speed of 5 m/s, the snowboarder is still moving to the right on the upper level. What is the snowboarder s final speed in this case?
a. 1 m/s
b. 2 m/s
c. 3 m/s
d. 4 m/s
Physics Work,Power & Energy Level: Misc Level
What should the height of a slide in a park be so that a child will reach the bottom of the slide with a speed of 15.0 m/s? Use g =10.0 m/s squared:
a. 22.5 m
b. 15.1 m
c. 11.3 m
d. 10.5 m
Physics Work,Power & Energy Level: Misc Level
The ratio of the potential energy to the kinetic energy of an object of mass m at a height of 40 m above ground level is 2:1. What is the speed of the object at that point? Use g = 10 m /s squared:
a. 10 m/s
b. 20 m/s
c. 30 m/s
d. 40 m/s
Physics Work,Power & Energy Level: Misc Level
A mass of 1.0 kg is pushed against a spring with a spring constant of 25 N/m. As a result, the spring is compressed by 20 cm.The mass is then released .What is the amount of potential energy acquired by the spring when it is compressed?
a. 5.0 J
b. 0.20 J
c. 0.50 J
d. 10 J
Physics Work,Power & Energy Level: Misc Level
An object of mass 20 kg is raised vertically through a distance of 8.0 m above ground level.Using g =10 m/s squared what is the potential energy of this object at this position?
a. 160 N/m
b. 160 N/m
c. 1600 N/m
d. 1600 N/m
Physics Work,Power & Energy Level: Misc Level
An object of mass 4.0 kg is moved from a point A to a point C as follows: 0.80 m vertically from A to B, and then 0.60 m horizontally from B to C. What is the amount of work done as the object is moved from point A to C? Use g =10 m/s squared.
a. 1.3 J from A to B and 16 J from B to C.
b. 2.2 J from A to B and 32 J from B to C.
c. 32 J from A to B and 0 J from B to C.
d. 4.0 J from A to B and 16 J from B to C.
Physics Work,Power & Energy Level: Misc Level
a massive piston traps a fixed amount of helium. after being brought to point (a) the system equillibrates at room temp. weight is then added to the piston adiabatically compressing the gas to half of it original volumn (b). the internal energy of the gas at (b) is ----- the internal energy of the gas at (a).
a.) greater than b.) equal to c.) less than
Physics Work,Power & Energy Level: Misc Level
A massive piston traps a fixed amount of helium gas. after being brought to point (a) the system equillibrates at room temp. Weight is then added to the piston adiabatically compressing the gas to half of it orginal volumn (b) . the entropy of the gas at (b) is ---the entropy of the gas at (a). (a) greater than b.) equal to c.) less than
Physics Work,Power & Energy Level: Misc Level
Find the work done by the force F=5i +5j +k over the distance from (0,0,0 ) to (10,25,30)
Physics Work,Power & Energy Level: Misc Level
On a rollar coaster ride the total mass of the cart -with passengers included -is 300 Kg. the first peak is 42 m above the ground, and the second peak is at 25.5 m . the second peak is 12.9 m /s. ( the wheel mechanism keeps the cart safely on the rails) how much energy is lost due to frictio between the two peaks? (in J )
Physics Work,Power & Energy Level: Misc Level
A 0.75- kilogram sphere is released from rest and is moving 5.0 m /s after falling 2.0 meter in a viscous medium. How much work is done by the viscous force on the block?
(a)-6.1 Joules
(b)-4.6 Joules
(c)-5.3 Joules
(d)-6.8 Joules
(e)-2.7 Joules
Physics Work,Power & Energy Level: Misc Level
A 331 kg piano is being lifted at a steady speed from ground level straight up to an apartment 14.6 m above the ground. The crane that is doing the lifting produces a steady power of 361 W. How much time does it take to lift the piano?
Physics Work,Power & Energy Level: Misc Level
A skier starts from rest at the top of a hill. The skier coasts down the hill and up a second hill,as the drawing illustrates. The crest of the second hill is circular, with a radius of 33.4 m. Neglect friction and air resistance. What must be the height h of the first hill so that the skier just loses contact with the snow at the crest of the second hill?
Physics Work,Power & Energy Level: Misc Level
A 0.568 kg basketball is dropped out a window that is 5.72 m above the ground. The ball is caught by a person whose hands are 1.58 m above the ground. (a) How much work is done on the ball by its weight? What is the gravitation potential energy of the basketball, relative to the ground, when it is (b) released and (c) caught? (d)What is the change (P Ef- P E o) in the ball's gravitational potential energy?
