power
What is power measured in (units)?
what is Watts, j/s, kg m2/s3
What is the equation for the average work?
what is Fdcos(theta)
What are the two possible forms of potential energy?
what is gravitational and spring potential energy
What are the 2 forms of kinetic energy?
what is Translational and Rotational kinetic energy
What is the first law of thermodynamics?
what is The law of conservation of energy/ energy cannot be created nor destroyed
What is the equation for average power?
what is (change in work)/(change in time), W/t or Fv
Net Work is the change in what?
what is Kinetic energy or negative potential energy
What is the formula for spring and gravitational potential energy?
what is Ug= mgh
Us=1/2Kx2
What is the formula for rotational and translational kinetic energy?
what is Kt= ½mv2
Kr= ½Iw2
For an object in projectile motion, describe the gravitational potential energy and kinetic energy when the object is at its maximum height?
what is The gravitational potential energy is at its maximum, and translational kinetic energy is at its minimum
If Sally exerts 51 watts on a block over 3 seconds, how much work does she exert on the block?
what is 153 J
Can the work due to gravity be negative or positive?
what is work due to gravity can be both
If a system only has translational kinetic energy and gravitational potential energy, which variable can cancel out when solving an energy problem?
what is mass
If the translational kinetic energy of an object doubles, by what factor does the velocity multiply, assuming that mass is constant?
what is square root of 2
As an object starting at rest rolls down a sloped ramp, how do gravitational potential energy, translational kinetic energy, and rotational kinetic energy change?
what is Gravitational potential energy decreases until the object reaches the bottom, and rotational and translational kinetic energy increase as the object rolls down the ramp.
If P(t)= 6t2+2, what is the work over the time interval t=0 to t=2?
what is 20 J
If a 2 kg ball is attached to a 3 m string of negligible mass and moves in a circular motion at a velocity of 4 m/s, what is the total work done on the ball over a time interval of 5 seconds?
what is 0 J
If an object hanging vertically in equilibrium from a spring is pulled down, what happens to the sum of the spring and gravitational potential energy?
what is The potential energy increases
If an object’s rotational kinetic energy is 600 joules and the moment of inertia of the object is 3 kg · m², what is the angular velocity of the object?
what is 20 rad/s
A block attached to a horizontal spring and held at rest at x=A and osscillates in simple harmonic motion when released. If the block initially has potential energy is U, what is the kinetic energy of the block when it is at x = A, x = 0, and x = ½ A?
what is Kinetic energy is 0 at x= A, U at x=0 and 3/4 U at x=½ Amax
If a force acting on a 2 kg block causes the block to accelerate at 6 m/s2 for a distance of 5 meters over a time interval of 4 seconds, what is the power exerted on the block?
what is 15 watts
A simple pendulum swings back and forth, with the forces acting on it being gravity on the object, tension in the supporting cord, and air resistance. Which of these forces is negative at all times of the pendulum's motion?
what is Air resistance
In space, how does an object’s gravitational potential energy change as it gets further from a planet?
what is gravitational potential increases
2 cylinders (with the same mass and radius), one hollow and one solid, roll up a ramp, with the same translational kinetic energy at the bottom of the ramp, stop at height Hs for the solid cylinder and Hh for the hollow cylinder. How do the heights compare?
what is The hollow cylinder will reach a greater height Hh>Hs
Two blocks connected by a compressed spring are released from rest on a frictionless surface. If the spring is considered part of the system, does the spring force do net work on the system?
what is No