Kinetic Energy
What is the Kinetic Energy of a 150 kg object that is moving with a speed of 15 m/s?
What is 16875 J or 16.785 kJ?
A 2-kg mass is attached to a spring. If the elongation of spring is 4 cm, what is the potential energy of the elastic spring? K = 500 N/m
What is 0.4 J?
What is the mechanical energy of a system with a 541 J potential energy and a 3.22 J kinetic energy?
What is 544.22 J?
Renatta Gass is out with her friends. Misfortune occurs and Renatta and her friends find themselves getting a workout. They apply a cumulative force of 1080 N to push the car 218 m to the nearest fuel station. Determine the work done on the car.
What is 235440 J?
A 1.5x103 kg car accelerates uniformly from rest to 10 m/s in 3 s. What is the power delivered by the engine in this time?
What is 25000 W?
An object moving with a speed of 21 m/s and has a kinetic energy of 140 J, what is the mass of the object?
What is 0.63 kg?
An athlete jumps onto a spring instrument with a weight of 500 N, the spring shortens 567 mm. Determine the amount of the potential energy with a k value of 12500 N/m.
What is 2009.31 J?
How much kinetic energy does a 1.2 kg ball have the moment it hits the ground 3.5 meters below when it starts from rest?
What is 41.20 J?
While training for breeding season, a 380 gram male squirrel does 32 pushups in a minute, displacing its center of mass by a distance of 8.5 cm for each pushup. Determine the total work done on the squirrel while moving upward (32 times).
What is 1 J?
A typical adult in the United States consumes something like 2000 kcal of food per day. Determine the average power generated by such an adult (assuming he or she is not gaining or losing weight). 1kcal = 4186 J
What is 96.90 W?
Two 3.0 g bullets are fired with speeds of 40.0 m/s and 80.0 m/s, respectively. What are their kinetic energies and which bullet has more kinetic energy?
What is 2.4 J, 9.6 J, and the bullet with an 80 m/s velocity?
In 1992, Ukrainian Sergei Bubka used a short pole to jump to a height of 6.13 m. If the maximum potential energy associated with Bubka was 4.80 kJ at the midpoint of his jump, what was his mass?
What is 159.64 kg?
If the spring of a jack-in-the-box is compressed a distance of 8.00 cm from its relaxed length and then released, what is the mechanical energy of the system? Assume the mass of the toy head is 50.0 g, the spring constant is 80.0 N/m, and the toy head moves only in the vertical direction. Also disregard the mass of the spring.
What is 0.26 J?
Lake Point Tower in Chicago is the tallest apartment building in the United States (although not the tallest building in which there are apartments). Suppose you take the elevator from street level to the roof of the building. The elevator moves almost the entire distance at constant speed, so that it does 1.15 × 105 J of work on you as it lifts the entire distance. If your mass is 60.0 kg, how tall is the building? Ignore the effects of friction.
What is 195.38 m?
A crane is being used to lift a 100 kg crate to a height of 10 m above the ground. If the crane's engine can provide a power output of 2000 W, how long does it take for the crane to complete the task?
What is 4.91 s?
An object has a kinetic energy of 25 J and a mass of 34 kg , how fast is the object moving?
What is 1.21 m/s?
The highest-caliber cannon ever built (though never used) is located in Moscow, Russia. The diameter of the cannon’s barrel is about 89 cm, and the cannon’s mass is 3.6×104 kg. Suppose this cannon were lifted by airplane. If the potential energy associated with this cannon were 8.88×108 J, what would be its height above sea level? Assume that constant free-fall acceleration at this altitude is the same as at sea level.
What is 2514.44 m or 2.514 km?
An ice skier sliding from a height of 50 m starts from rest. What is the velocity of the skier at 10 m from the ground?
What is 28.01 m/s?
Hans Full is pulling on a rope to drag his backpack to school across the ice. He pulls upwards and rightwards with a force of 22.9 Newtons at an angle of 35 degrees above the horizontal to drag his backpack a horizontal distance of 129 meters to the right. Determine the work (in Joules) done upon the backpack.
What is 2419.86 J?
Suppose that a 1000 kg car accelerates from rest to 50 m/s in 7.5 s. What is the power of the engine needed for this process?
What is 166666.67 W?
In 1994, Leroy Burrell of the United States set what was then a new world record for the men’s 100 m run. He ran the 1.00×102 m distance in 9.85 s. Assuming that he ran with a constant speed equal to his average speed, and his kinetic energy was 3.40×103 J, what was Burrell’s mass?
What is 66 kg?
Suppose a 51 kg bungee jumper steps off the Royal Gorge Bridge, in Colorado. The bridge is situated 321 m above the Arkansas River. The bungee cord’s spring constant is 32 N/m, the cord’s relaxed length is 104 m, and its length is 179 m when the jumper stops falling. What is the total potential energy associated with the jumper at the end of his fall? Assume that the bungee cord has negligible mass.
What is 161044 J?
An 85 kg roller coaster cart is traveling 4 m/s at the top of a hill 50 meters off the ground. How fast is it traveling at top of a second hill 20 meters off the ground?
What is 24.59 m/s?
Sheila has just arrived at the airport and is dragging her suitcase to the luggage check-in desk. She pulls on the strap with a force of 190 N at an angle of 35° to the horizontal to displace it 45 m to the desk. Determine the work done by Sheila on the suitcase.
What is 7003.75 J?
How much power does a person with a mass of 50 kg exert when they climb up 10 meters in 100 seconds?
What is 49.05 W?