Here ,
at the half height
the potential energy will be half of the initial potential energy
as the mechanical energy is conserved
kinetic energy = 100 - 50
kinetic energy = 50 MJ
the correct option is b) 50 MJ
A shiny sports car at the top of a vertical cliff has a potential energy of...
A 2.45 kg rock is dropped from the top of a 15.5m vertical cliff a)What is the potential energy of the rock relative to the base of the cliff before it is dropped b) What is the kinetic energy of the rock just before it hits the ground below? c) What is the velocity of the rock at a point 5.00 m above the base of the cliff? d) How much total energy does the rock have half way down?
A ball has a mass of 0.5kg. Dropped from a cliff top, the ball strikes the sea below at a velocity of 10m/sec. a. What is the kinetic energy of the ball as it is about to strike the sea? b. What was its potential energy before it was dropped? c. From what height was the ball dropped? d. A stone of mass 1 kg also strkes the sea at 10m/sec. Repeat stages a, b and c above to find...
7 A ball has a mass of 0.5 kg. Dropped from a cliff top, the all strikes the sea below at a velocity of 10 m/s. /s. a) What is the kinetic energy of the ball as it is about to b) What was its potential energy before it was c) From what height was the ball dropped? strike the sea? dropped? Repeat stages a, b, and c above to find the height t is a d) A stone of...
I need help with problem 39 parts b,c,d
Unit 7. Work and Energy In Class Packet Name: 36. A 2.45 kg rock is dropped from the top of a 15.5 m vertical cliff a. What is the potential energy of the rock relative to the base of the cliff before it is dropped? b. What is the kinetic energy of the rock just before it hits the ground below? c. What is the velocity of the rock at a point...
1. Is it possible for a system to have negative gravitational potential energy? a) Yes, as long as the kinetic energy is positive. b) Yes, as long as the total energy is positive. c) Yes, since the choice of zero of gravitational potential energy is arbitrary. d) No, because the kinetic energy of a system must equal its gravitational potential energy. e) No, because you can't have negative energy. 2. In an isolated system, for which of the following types...
Question 1 1 pts What is the kinetic energy of a man who weighs 980N who is riding in a car traveling 40 km per hour? Express your answer in Joules, but don't type the unit in the answer box. Round to the nearest whole number. (Careful with the units) 1 pts Astudent slides her 80.0-kg desk across the level floor of her dormitory room a distance 4.00 m at constant speed. If the coefficient of kinetic friction between the...
2. Suppose a car travels 108 km at a speed of 20.0 m/s, and uses
2.20 gallons of gasoline. Only 30% of the gasoline goes into useful
work by the force that keeps the car moving at constant speed
despite friction. (The energy content of gasoline is 1.3 ✕
108 J per gallon.)
(a) What is the force exerted to keep the car moving at constant
speed?
N
(b) If the required force is directly proportional to speed, how
many...
ski lifts are too scary for you, so you let a cord drag you up the hill, while your snowboard slides along the ground. oou are modeled as a 50-kg box, of course)Trying to save energy, the ski company runs the cord over a pulley at the top of the mountain, with a 40-kg mass hanging over a cliff on the other end of the cord. The ski hill makes an angle of 30 with the horizontal. a It doesn't...
mass vibrates on an ideal spring as illustrated below. The total energy of the spring is 100 J. What is the kinetic energy of the mass at point P, halfway between the equilibrium point and the amplitude? P Equilibrium A. 50 J B. 200 J C. 75 J D. 100 J E. 25 J When a weight Wis hanging from a light vertical string, the speed of pulses on the string is v. If a second weight Wis added without...
A mass vibrates on an ideal spring as illustrated below. The total energy of the spring is 100 J. What is the kinetic energy of the mass at point P, halfway between the equilibrium point and the amplitude? P Equilibrium A. 50 J B. 200 J C. 75 J D. 100 J E. 25 J When a weight Wis hanging from a light vertical string, the speed of pulses on the string is v. If a second weight Wis added...