The staples inside a stapler are kept in place by a spring with a relaxed length of 11.5 cm. The spring constant is 51.0 N/m. How much elastic potential energy is stored in the spring when its length is 8 cm?

A Jack-in-a-box is a children's toy, where a doll (the "jack"), attached to a compressed spring, is secured in a closed box. The box is resting on a smooth horizontal surface when it is knocked over, causing the lid of the box to open. The energy stored in the spring is released and the doll is propelled out of the box along the horizontal surface. If the spring has a spring-constant 36 N/m, how much energy (in Joules) was stored in the spring if the base of the doll moves 0.9 m out of the box.

A box with mass 1.78 kg is being pulled across a rough surface with a coefficient of kinetic friction Hk = 0.398. The pulling force has a magnitude %D of 14.5 N and is directed at an angle 20.4 degrees above horizontal. If the box is dragged a distance of 10.8 m, what is the total energy lost to friction? (Hint: be sure to account for the upward component of the pulling force.) Image size: s ML Max F 9. m Dlogno ont mote oro

Humans can produce an output power as great as 20 W/kg during extreme exercise. Sloths are not so energetic. At its maximum speed, a 4.0 kg sloth can climb a height of 6.0 m in 2.0 min. What’s the specific power for this climb?

(8c7p50) A 0.45 kg mass sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (with k = 725 N/m) whose other end is fixed. The mass has a kinetic energy of 12.0 J as it passes through its equilibrium position (the point at which the spring force is zero). At what rate is the spring doing work on the mass as the mass passes through its equilibrium position? Submit Answer Tries 0/5 At what rate is the spring doing work on the mass when the spring is compressed 0.091 m and the mass is moving away from the equilibrium position? Submit Answer Tries 0/5 This discUSsion is closod Send Feedbac

A spring is compressed 0.100 m and launches a 3.25 kg object across frictionless ice. After some distance, the object hits a rough patch of ice where the coefficient of kinetic friction of the object on the surface is 0.200. If the spring constant of the spring is 137 N/m, find the distance the object travels across the rough patch of ice using work and energy.

12:45 1 4) A roller coaster of mass 80.0 kg is moving with a speed of 20.0 m/s at position A as shown in the figure. The vertical height above ground level at position A is 200 m. Neglect friction. 200 m 160 m -- Potential Energy 0 A.What is the total mechanical energy of the roller coaster at point A? B. What is the total mechanical energy of the roller coaster at point B? C. What is the speed of the roller coaster at point B? Explain your D. What is the speed of the roller coaster at point C? answer

A compressed spring has the potential energy of 20 J and its spring constant is 200 N/m. Calculate the displacement or extension of the spring.

In the figure below the block has m = 3.0 kg and the spring has k = 350 N/m. If the block, initially at rest, is released from a height of 0.8 m, what is the maximum compression of the spring? Ignore friction.

A spring is characterized by a spring constant of  60N/m. How much potential energy does it store when stretched by  0.5cm?