Physics Work,Power & Energy Level: Misc Level
A 60 kg women runs up a staircase 15 m high ( vertically ) in 20 sec. a ) How much power does she expend. b) What is her horsepower rating.
Physics Work,Power & Energy Level: Misc Level
In common speech, we often use the words energy and power interchangeably as if they were synonyms. However, in physics, they have distinctly different definitions and are not synonymous. Explain the difference between these terms as they are used in physics.
Physics Work,Power & Energy Level: Misc Level
If you push vigorously against a brick wall, how much work do you do on the wall? Explain.
Physics Work,Power & Energy Level: Misc Level
A soft drink manufacturer claims that a new diet drink is " low Joule." The label indicates the available energy is 6300J. What is the equivalent of this energy in Calories (1 Calorie =1000 cal)?
Physics Work,Power & Energy Level: Misc Level
A Weight lifter manages to snatch a 104 kg weight a distance of 1.5 m. How many kcal of heat energy are equivalent to this lift?
Physics Work,Power & Energy Level: Misc Level
At what temperature (K) does the average KE of a molecule in an ideal gas equal 3.9 10-21 J?
Physics Work,Power & Energy Level: Misc Level
A 4.0 bullet traveling at a speed of 380 m/s enters a tree and exits the other side with a speed of 180 m/g. what was the energy transferred?
Physics Work,Power & Energy Level: Misc Level
Your car runs out of fuel on a deserted highway. As your car slows to a stop you wonder what happened to all of the kinetic Energy that it just had. Where did this energy go? Was the total energy conserved?Explain.
Physics Work,Power & Energy Level: Misc Level
You are standing at the Express Lube watching as your car is serviced. The hoist is powered by a 3000 watt motor.
a.How long would it take to raise Gary s 3000 Ib truck 2.5 meters?
b.How long would it take with a 5,000 watt motor?
Physics Work,Power & Energy Level: Misc Level
The fastest that a human has run is about 12.2 m/sec If an Olympic pole vaulter could run this fast and convert all of his or her kinetic energy into gravitational potential energy, how high could he or she go?
Physics Work,Power & Energy Level: Misc Level
While in orbit about the earth, the space shuttle mass is 80.000 kg and its speed is 7,900 m/sec. What is its kinetic energy?
Physics Work,Power & Energy Level: Misc Level
A bullet of mass (m) and initial speed (v) strikes, and is embedded in the end of a uniform rod of mass (2m) and length (L)originally at ret. The rod pivots about a fixed axis at its center.
a)what is the angular momentum of the bullet/ rod system with respect to the axis through the rod s pivot?
b)what is the angular speed of the rod after the collion?
c)How much kinetic energy is lost in the collion?
Physics Work,Power & Energy Level: Misc Level
A block of wood with a mass of 4. 65 kg is resting on a horizontal surface when a bullet with a mass of 18.0 grams and moving with a speed 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: Misc Level
A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is ajar and at rest. A ball with a mass of 500 g is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. The ball rebounds with a speed of 16.0 m/s along the same line. what is the angular speed of the door after the collison?
Physics Work,Power & Energy Level: Misc Level
A 3.50 g bullet, traveling at 250 m/s his a hinged, light board at a right angle a distance of 65.0 cm from its hinges and emerges on the other side of the board with a speed of 150 m/s. The board is initially stationary, is free to rotate about its hinges and has a moment of inertia of 0.275 kg x m squared. what is the angular speedof the board after the bullet emerges?
