The spring in the above figure has a spring constant of K = 140 N/m. A 150 g block is placed against the spring which is then compress to 16 cm. A) When the block is released, how high up the slope does it rise? B) What is the kinetic energy at the highest point? C) What is the potential energy at the highest point?

a.) A student is riding a bicycle at a constant speed of 6.0 m/s on a level road. The mass of the student and bicycle together is 80 kg. Assume the friction and drag is 35 N. What is the student's output power, in Watts?  b.) A student is riding a bicycle at a constant speed of 6.0 m/s on a 7.0º hill. The mass of the student and bicycle together is 80 kg. Assume the friction and drag is 35 N. What is the student's output power, in Watts?

A 0.25-kg stone is held 1.4 m above the top edge of a water well and then dropped into it. The well has a depth of 5.4 m (a) Taking y = 0 at the top edge of the well, what is the gravitational potential energy of the stone-Earth system before the stone is released? J 0 at the top edge of the well, what is the gravitational potential energy of the stone-Earth system when it reaches the bottom of the well? (b) Taking y J (c) What is the change in gravitational potential energy of the system from release to reaching the bottom of the well? J

A sledder has 500 J of potential energy and 230 J of kinetic energy at one point on a steep hill.  How much kinetic energy will the sledder have at the bottom of the hill? (Assume negligible air resistance and friction.) b. As the sledder goes down the hill and picks up speed will their potential and kinetic energy increase or decrease.

For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.00 m at a constant speed in a time of 1.60 s. a.) What is the output energy, in kJ (kiloJoule)? b.) What is the metabolic energy, in kJ (kiloJoule)? c.) How much thermal energy is created in this process, in kJ (kiloJoule)?

Starting from rest, a 6.2-kg block slides 3.2 m down a rough 37-degree incline. The coefficient of kinetic friction between the block and the incline is μk = 0.55. a)  Determine the work done by the friction force between block and incline. b)  Determine the work done by the normal force. c)  Determine the net work done on the block.

Forces: A. A force is called conservative if: a. It has a magnitude of less than 0.9N b. It cannot be resolved into x & y components c. Only friction is a conservative force. d. The work done by the force between two points is independent of the shape of the path connecting the points.   B. An object is dropped from the top of a 30.0 m tall building. Neglecting air resistance, use conservation of energy to calculate how fast it’s going just as it reaches the ground.

Which of the following statements are true?   options:   The rest length of a spring is where it applies zero force.   The spring constant has units of N/m.   Work can be calculated for a force that depends on position.   Work is the slope of the force vs. position graph.   If we stretch a spring twice as far beyond the rest length, the spring force is 4x larger.   If we stretch a spring twice as far beyond the rest length, the potential energy is 4x larger.

An object moves along the x axis, subject to the potential energy shown in the figure. (Figure 1) The object has a mass of 2.4 kg and starts at rest at point A. A) What is the object's speed at point B? B) What is the object's speed at point C? C) What is the object's speed at point D? D) What are the turning points for this object? Check all that apply. Point A Point B Point C Point D Point E