3. a) A 45 g mouse with a kinetic energy of 5.0 J is fleeing a cat. Calculate the speed of the mouse. b) A worker lifts a crate 120 cm vertically. If the lift increases the gravitational potential energy by 97 J, determine the mass of the crate.
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3. a) A 45 g mouse with a kinetic energy of 5.0 J is fleeing a cat. Calculate the speed of the mouse.
b) A worker lifts a crate 120 cm vertically. If the lift increases the gravitational potential energy by
97 J, determine the mass of the crate.
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- A 72.0 kg swimmer jumps into the old swimming hole from a tree limb that is 3.75 m above the water. 1) Use energy conservation to find his speed just as he hits the water if he just holds his nose and drops in. Express your answer in meters per second. 2) Use energy conservation to find his speed just as he hits the water if he bravely jumps straight up (but just beyond the board!) at 2.20 m/s. Express your answer in meters per second. 3) Use energy conservation to find his speed just as he hits the water if he manages to jump downward at 2.20 m/s. Express your answer in meters per second.A rope exerts a force F⃗ on a 20.0-kg crate. The crate starts from rest and accelerates upward at 5.00 m/s2 near the surface of the earth. What is the kinetic energy of the crate when it is 4.0 m above the floor ?1) What constant force P is required to bring the 100-lb body, which is initially at rest, to a velocity of 30 ft/sec in 20 ft? The coefficient of friction is 0.2. Solve using Newton's Second Law. 2) Solve Question 1 using Work and Energy. 100 lb 20° P 30°
- Karen lifts a 10.0 kg box up from the ground to a height of 1.50 meters. He then lowers the box to 0.630 m above the ground. What is the change in potential energy of the box in Joules? change in potential energy between final and inital height.Consider a mass m=81.6 kg sliding on a frictionless surface as shown in the figure below. It begins with a speed of vi = 1.81 m/s at a height of yi = 21.4 m above the ground. It then travels down one hill and up the next until it momentarily comes to rest with a speed vi = 0. a) What is its kinetic energy of the mass at the start? b) What is its gravitational potential energy of the mass at the start?An Olympic weightlifter lifts a 2200 N barbell a distance of 2.2 m. This takes 1.80 s. a. Find the work done by the weightlifter on the barbell in Joules.b. Find the power output of the weightlifter in Watts and in horsepower (hp). Note: 1 hp = 746 W
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- 3A 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.A car accelerated from rest to a speed of 20 m/s in a time of 5.6 s. The car has a weight of 9000N. Determine the average power needed to accelerate the car.