Physics question and answers for May 31, 2024
- Q A 150 lb (667 N) diver needs to get to the top of a 10 m high diving board. Which method of getting to the top would require the most...
- Q A girl with 40kg mass is riding an 8 kg bicycle. At the top of the hill her speed is 6.0 m/s, and her speed triples at the bottom of...
- Q A 0.2 kg mass is dropped from a 10 m high building on top of a spring that is placed vertically. It stops after moving 9.2 meters down and stops...
- Q A worker pulls a wagon along the horizontal surface. Weight of the wagon is 80N and the worker exerts 90N force at an angle of 20 above the horizontal for...
- Q A spring is attached to the ceiling and pulled 5 cm down from equilibrium and released. After 3 seconds the amplitude has decreased to 4 cm. The spring oscillates 10...
- Q A 0.15-kg baseball approaches the bat traveling to the right at 40 m/s and leaves thebat traveling left at 60 m/s. If the ball is in contact with the bat...
- Q A wind turbine works by slowing the air that passes its blades and converting much of the extracted kinetic energy to electric energy. A large wind turbine has45-m-radius blades. In...
- Q A 79 kg bike racer climbs a 1400-m-long section of road that has a slope of 4.3.By how much does his gravitational potential energy change during this climb?
- Q 180 students sit in an auditorium listening to a physics lecture. Because they are thinking hard, each is using 125 W of metabolic power, slightly more than theywould use at...
- Q Mark pushes his broken car 190 m down the block to his friend's house. He has to exert a 150 N horizontal force to push the car at a constant...
- Q A child with mass m = 15.8 kg slides down a slide 4.99 m high, and reaches the bottom with a speed of 4.43 m/s. How much thermal energy (in...
- Q How much work does an elevator motor do to lift a 1300 kg elevator a height of 100 m ?
- Q A 0.44 kg object travels from point A to point B. If the speed of the object at point A is 3.0 m/s and the kinetic energy at point B...
- Q An electrical power station uses 1.53 x 10^14 J of heat input with an efficiency of 26.2%.(a) How much work is done?(b) How much waste heat is produced by the...
- Q In a Broadway performance, an 77.0-kg actor swings from a R = 3.70-m-long cable that is horizontal when he starts. At the bottom of his arc, he picks up his...
- Q The electric motor of a model train accelerates the train from rest to 0.700 m/s in 29.0 ms. The total mass of the train is 635 g. Find the average...
- Q A 74-kg base runner begins his slide into second base when he is moving at a speed of 4.1 m/s. The coefficient of friction between his clothes and Earth is...
- Q A bungee jumper jumps from a high bridge 100 m above a river. How fast does he fall after he has covered 60 m after jumping from the bridge? (Ignore...
- Q At what speed should a ball of mass 200 g be rolled in order to reach the other side of a slope, 10 mhigh?12 m/s13 m/s14 m/s15 m/s
- Q Look at the picture.Sam applied a force parallel to the ramp to move 25 kg of sand to the top of the ramp. The ramp is15 m long and 3.0...
- Q Now that you know how to calculate kinetic energy, you can figure out whether the bus or the baseball has more energy. Remember, the bus has a speed of 1.3...
- Q A 340 kg piano slides 2.7 m down a 24 incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (see...
- Q A ball is attached to a string that is 1.5 m long. It is spun so that it completes two fullrotations every second. What is the centripetal acceleration felt by...
- Q When the car is on the horizontal track after being launched, how fast is the car moving?m/sA spring loaded toy car launcher is made with a spring constant of 101...
- Q A cheetah with a mass of 58 kg, is initially running only 6 m/s. The cheetah sees and begins to chase a tasty antelope, accelerating to a final velocity of...
- Q A sledder has 458 J of potential energy and 102 J of kinetic energy at one point on a steep hill. How much kinetic energy will the sledder have at...
- Q If you push a cart three times as far while applying the same force, you doSelect one:a. the same amount of work.b. half as much work.c. three times as much...
- Q A skier with a mass of 83 kg has a speed of 11.1 m/s on a hilltop. The skier then goes down the hill with a vertical drop of 10.1...
- Q Calculate the kinetic energy of a particle with a mass of 3.34 x 10-27 kilogram and a speed of 2.89 105 meters per second.
- Q A boulder rolls from the top of a mountain, travels across a valley below, and rolls part way up the ridge on the opposite side. Describe all the energy transformations...
- Q Ned (40kg) and Ed(54kg) are twins. Ned runs up stairs (6m high) in 3 s while Ed walks up the same stairs in 7s. Who did more work? Ed did...
- Q Which state summarizes the Law of Conservation of Momentum? *Matter can neither be created nor destroyed.The total momentum in a system stays the same before and after an interaction.Every action...
- Q At the bottom of its swing, a Pendulum has a kinetic energy of 3 J. What is the potentialenergy for the pendulum at the top of the swing?
- Q A spring does 5.0 J of work on a 0.10-kg ball bearing in a pinball machine. The ball's resulting speed just after leaving the spring is.5 m/s1 m/s5 m/s10 m/s
- Q An electric motor attached to a pickup truck is used to rescue and lift a climber out of a canyon. If it lifts the climber 10.20 m in 18.0 s...
- Q A box with a mass 2 kg is sliding along on a friction-free surface at 9.87 m/s at a height of 1.81 m. It travels down the hill and then...
- Q A 20-kg box is lifted with a constant velocity through a height change of +4 m and then held in place. How much work is done on the box DURING...
- Q (6) A 20-kg box is lifted with a constant velocity through a height change of +4 m and then held in place. How much work is done on the box...
- Q A woman pushing a box exerts 9.87 N*m worth of of work on it, how much energy does shetransfer to the box if she pushes the box 5 meters?Round your...
- Q A roller coaster car of mass 1500-kg starts from rest at an elevation of 35.0 m high and rolls down and then up another incline of lower height 18.0 m....
- Q A 5.0 kg block is at rest on a horizontal rough surface. It is now pushed up against a spring (k = 300 N/m) and the spring is compressed a...
- Q Jeff is part of a trekking team. As he climbs a hill, he drops his water bottle, which has a mass of 0.25 kilograms. The bottle slides down the hill...
- Q Paul and Ivan are riding a tandem bike together. They're moving at a speed of 5 meters/second. Paul and Ivan each have a mass of 50 kilograms. What can Paul...
- Q Using your calculation in question 2, calculate how long it would take this person to burn a 250-Calorie iced mocha, (Remember: 1 Calorie = 4184 J)Mass: 70 kg, Height of...
- Q A 2.5 hp (1 hp = 744 W) motor is used to power a hoist to lift a 1700 kg car 1.86 m above the garage floor.a)How much time does...
- Q An object that is in motion hasmechanical energypotential energykinetic energyacceleration
- Q You slide a 0.12-kg coffee mug 0.15 m across a table. The force you exert is horizontal and of magnitude 0.10 N. The coefficient of kinetic friction between the mug...
- Q You performed the lab again in hopes that another group member could do better. Use the following information to calculate their power using both W/t and Fv.Mass: 70 kg, Height...
- Q A block of 1.0 kg with speed 1.0 m/s hits a spring placed horizontally, as shown in Figure 7. The spring constant is 1000.0 N/m. (a) Calculate the maximum compression...
- Q A 5.9 kg bag is held by a string to the ceiling as shown in the diagram below. A 15 g bullet travelling at 361 m/s strikes the stationary bag....
- Q Part (b) refers to the figure below. The block then goes up the inclined plane again. After the block travels a distance x, the block leaves the spring. The block...
- Q A system containing a compressed spring, a rubber ball, Earth and air 10 at one point of time contains a grand total of 1000 J of energy. No work was...
- Q If the change in momentum is negative while mass is constant, then...Initial momentum is greater than final momentumFinal momentum is greater than initial momentumKinetic energy decreasesKinetic energy remains the sameKinetic...
- Q Suppose that an object moves downward with an increasing speed. In this situation, the object's kinetic energy would its potential energy would and its total mechanical energy would. Enter the...
- Q Which statement is always true of an object that has kinetic energy?Select one:a. The object is moving on the ground.b. The object is on the ground.c. The object is at...
- Q For questions 3-5, refer to the following information. You are on roller blades on top of a small hill. Your potential energy is equal to 1,000 joules. The last time...
- Q A winch is a device used to lift lobster traps out of the water and onto a lobster boat. The winch applies a force of 300 N to lift a...
- Q Use the steps you used in the last two problems to solve. A 4357-kg roller coaster car starts from rest at the top of a 36.5-m high track. Determine the...
- Q Ben Travlun carries a 149-N suitcase up three flights of stairs (a height of 8.7 m) and then pushes it with a horizontal force of 38.9 N at a constant...
- Q An ideal spring is hung vertically in its equilibrium position from a ceiling. When a 3.0 kg mass hangs at rest from it, the spring is extended 8.0 cm from...
- Q A delivery man carries a 5.0-kg box up a flight of stairs 4.0 m above theground. How much work was done on the box by the man? Remember thathe is...
- Q Describe the impact of air resistance on the conservation 2 of total mechanical energy. What type of energy does air resistance use to do work? What type of energy increases...
- Q 6. A battery converts x J of energy in t seconds. Which of the following hasthe greatest power?A.) x = 3000 Jt = 5.0 sB.) x = 3000 Jt =...
- Q 4. Which of the following is true about conservation of energy?OA.) Energy can be created within an isolated system.B.) Energy is conserved when the potential energy of a system is...
- Q 6. A toy train car of mass 1.4 kg is moving forwards with a velocity of 2.8 m/s when it strikes astationary second toy car of mass 1.0 kg. The...
- Q Suppose that two horizontal forces are acting upon a 0.25 kg block: a 5 N force pulling the block and a 2 N frictional force opposing the motion. The block...
- Q Our central air conditioner uses 10,000 watts on 240 volts. If we leave the thermostat at 76 degrees it runs an average of 8 hours per day. If we move...
- Q An alpha particle of 4 atomic mass unit is scattered at an angle of 60 after colliding with an oxygen nucleus of 16 atomic mass unit. on the other hand,...
- Q While playing frisbee, you get it stuck 9 meters above you in a tree. You know that if you hit the frisbee hard enough with the rock, you will dislodge...
- Q Write a custom energy statement for each question when appropriate:W=Fd P W/At PEg = magh KE = 1/2mv21. Fignewton pulls a 500. N sled along a flat snowy path using...
- Q The largest falls stemming from the Niagara River is the Horseshoe Falls or Canadian Falls. There were 15 attempts to go over the falls between 1901 and 1995.How could the...
- Q A construction worker, 28 feet up on a scaffold, lifts a 4-lb rope hand over hand up to the scaffold to raise a cement block weighing 7 pounds off the...
- Q A tank that is 6 feet deep, with a square bottom with sides 4 feet each, has 3 feet of kerosene that weighs 49.9 lb/ft in it. How much work...
- Q A little boy is in a treehouse, 18 feet up in a tree. He lifts a 3-lb rope hand over hand up to the treehouse. The rope fully extends from...
- Q In a playground, a balloon collides with a much heavier soccer ball. During the collision, which of the following is true?The magnitude of the force exerted by the soccer ball...
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