Physics question and answers for May 30, 2024
- Q A 400 hp engine in a 1,600 kg car applies maximum force for 2 seconds to accelerate the car onto the interstate. If the car moves at 8 m/s before...
- Q A spring is placed horizontally on a frictionless table. The spring constant of the spring is 50 N/m, and it iscompressed 0.1 m by a 2 kg block.a. How much...
- Q (8c7p50) A 0.40 kg mass sliding on a horizontal frictionless surface is attached to one end of a horizontal spring (with k = 550 N/m) whose other end is fixed....
- Q If a motor lifts a 400.-kilogram mass a vertical distance of 10. meters in 12.3 seconds, the minimum power generated by the motor is * 3.3 x 10^2 watts 4.9...
- Q A student, starting from rest, slides down a water slide. On the way down, a kinetic frictional force (a nonconservative force) acts on her. The student has a mass of...
- Q A sled of mass 70 kg starts from rest and slidesdown a 10 incline 80m long. It then travels for 20m horizontally before starting back up an 8incline. It travels...
- Q The power you need to carry a 1.0-kilogram bag of dog food up a 6.0- meters flight of stairs is 5.5 watts. How long did it take you to accomplish...
- Q A particle is subject to a force Fx that varies with position as shown in the following figure.(a) Find the work done by the force on the particle as it...
- Q A car is parked at the top of a 64 m -high hill. It slips out of gear and rolls down the hill.How fast will it be going at the...
- Q Which requires more work, stopping a 4.0 kg object moving at 2.0 m/s, or stopping a 2.0 kg object moving at 4.0 m/s?A. Stopping the 4.0 kg object.B. Stopping the...
- Q A spring with a force constant of 5.0 N/m has a relaxed length of 2.59 m. When a mass is attached to the end of the spring and allowed to...
- Q The two ropes seen in (Elgure 1) are used to lower a 255 kg plano exactly 4 m from a second-story window to the ground.
- Q To maintain an automobile in approximately constant acceleration, its engine must develop power that increases with time. Suppose that in one situation the work done by an engine is given...
- Q A baseball is thrown from the outfield toward the catcher. When the ball reaches its highest point, which statement is true?A. Its velocity is not zero, but its acceleration is...
- Q Two identical tiny balls of highly compressed matter are 1.50 m apart. When released in an orbiting space station, they accelerate toward each other at 2.00 cm/s2. What is the...
- Q A 2 kg toy car moves at a speed of 5 m/s.a. What is the kinetic energy of the car?b. If a child applies a 3 N force for 2...
- Q If the net force applied by the truck ramp in the previous question is -300,000 N, how far along the ramp will the truck move as it stops?
- Q A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40 J. At the exact top of its trajectory, its total...
- Q Rita raises a 10kg package to a height of 2.5 m in 2.0 s.(a) How much work did she do on the package?(b) How much power was expended on the...
- Q A 100%-efficient engine is being used to raise a 89-kg crate vertically upward at a steady rate. If the power output of the engine is 1620 W, how long does...
- Q A spring-loaded dart gun is used to shoot a dart straight up into the air, and the dart reaches a maximum height of 24 meters. The same dart is shot...
- Q A roller coaster starting from rest descends 35 meters in its initial drop and then rises 23 meters when it goes over the first hill, which has a circular shape...
- Q A sailboat moves north for a distance of 10.00 km when blown by a wind from the exact southeast with a force of 2.00 104 N. The sailboat travels the...
- Q A 3.5 kg rock is on a spring launcher pointed vertically into the sky. It has a spring constant of 400 N/m and is compressed by 0.25 m.a. What was...
- Q A frictionless simple pendulum, with a small but dense 4.4-kg mass at the end and a length of 75 cm, is released from rest at an angle of 50 with...
- Q Stan raises a 1200-N piano a distance of 5.00 m using a set of pulleys. Stan pulls in 20.0 m of ropea. How much effort force would Stan apply if...
- Q A Pilgrim uses a block and tackle to lift a 225 N crate a distance of 16.5 m. She pulls 33.0 m of rope with a force of 129 N....
- Q When you crushed the chalk with a block, you released the 5 kg block from a height of 1 m above the chalk. a. What is the gravitational potential energy...
- Q A car of mass 1500 kg is at the top of a tall parking structure 24 meters tall. Unfortunately, this car has no engine and must coast to the bottom...
- Q A train is traveling at 30.0 m/s relative to theground in still air. The frequency of the note emittedby the train whistle is 262 Hz.The speed of sound in air...
- Q A projectile is fired with an initial speed of 36.6 m/s at an angle of 42.2 above the horizontal on a long flat firing range. Determine (a) the maximum height...
- Q A driver notices that her 1080-kg car, when in neutral, slows down from 95 km/h to 65 km/h in about 7.0 s on a flat horizontal road. Approximately what power...
- Q Instead of traditional brakes, a new type of roller coaster is slowed down by a spring. The coaster has 5.0 x 105 J of kinetic energy before it compresses the...
- Q A pop-up toy has a mass of 87.2 g and a spring constant of 57 newtons per meter. A force is applied to the toy to compress the spring 0.025...
- Q A proton has momentum with magnitude po when its speed is 0.440c. In terms of po, what is the magnitude of the proton's momentum when its speed is doubled to...
- Q In a harbor, oil is pumped from the tanks of a ship to a storage tank on land which is 45 m higher in elevation. The total amount of energy...
- Q The force constant of a spring is 138 N/m.(a) Find the magnitude of the force required to compress the spring by 4.95 cm from its unstretched length.(b) Find the magnitude...
- Q Pete Zaria works on weekends at Barnaby's Pizza Parlor. His primary responsibility is to fill drink orders for customers. He fills a pitcher full of Cola, places it on the...
- Q How much work W must be done on a particle with a mass of m to accelerate it from a speed of 0.890 c to a speed of 0.986 c...
- Q A solid nonconducting sphere of radius12.0 cm is made of two layers. The innermost section has a radius of 6.0 cm and auniform charge density of -4.0 C/m. The outer...
- Q Roller-coaster car speed using energy conservation. Assuming the height of the hill in Fig. 6-18 is 40 m, and the roller-coaster car starts from rest at the top, calculate (a)...
- Q You were tasked with pushing a large box of textbooks across the commons area at Elevation. The box of textbooks have a mass of 23kgs and the total displacement is...
- Q A 755 N diver drops from a board 10.0 m above the water's surface. Find the mechanical energy of the system, and find the diver's speed 5.00 m above the...
- Q A thin flexible uniform chain of mass 'm' and length 'l' is suspended from point 'O' so that its lower end just touches a smooth inelastic fixed plane of inclination...
- Q You and an elephant are having a sled race down the hill next to the school. You bothstart at the same height.a. Who has more potential energy?b. Who reaches the...
- Q Chemical A. Energy stored in the atom.Nuclear B. Energy stored in molecular bonds.Mechanical C. Caused by friction. Heat.Thermal D. Due to moving electrons.Electrical E. From light.Radiant F. Any kinetic or...
- Q A 62-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any...
- Q if an object has 100 joules of potential energy at the top of a ramp How much kinetic energy will there be at the other two places indicated? What assumptions...
- Q An 8 kg box at rest on the ground is pushed by a force for 12 m. The box ends up going 3 m/s (and there is no friction).A) Ebefore...
- Q Potential (Ep) or Kinetic (E) Energy___ A car is traveling 45 mph.___ A rock is on a ledge 5 meters high.___ A car is resting at the top of a...
- Q Circle the one with more Potential EnergyA 25 kg mass or a 30 kg mass at the top of a hill?A car at the top of the hill or the...
- Q A 25 kg mass or a 30 kg mass going 5 m/s.Two 10 kg masses, one going 75 m/s, one going 45 m/s.A car at rest or a car rolling...
- Q A bullet of mass 10 10- kg moving with a speed of 20ms- hits an ice block (0c) of 990 g kept at rest on a frictionless floor and gets...
- Q A block of ice of mass 50 kg is sliding on a horizontal plane. It starts with speed 5 m/s and stops after moving through some distance. The mass of...
- Q A body of mass 200 g begins to fall from a height where its potential energy is 80 J. Its velocity at a point where kinetic and potential energies are...
- Q A fixed pulley is driven by a 100kg mass falling at a rate of 8.0m in 4.0s. It lifts a load of 75.0kgf. What is the power input to the...
- Q A magnet of magnetic moment M is lying in a magnetic field of induction B. W? is the work done in turning it from 0 to 60 and W2 is...
- Q A chain of mass m and length / is kept on a table as shown. It is about to move in this position. If it is disturbed slightly then it...
- Q Suppose that a block is dropped from rest onto a spring that is oriented vertically. The block falls 1.5 m before landing on the spring (spring constant = 160 N/m)...
- Q There is a net force of 50 N exerted on a car that traveled 325 meters. The force is exerted in the same direction of travel. What is the net...
- Q An ice skater in a red jacket is skating south when they collide with, and hold onto, a second skater in a blue jacket who is traveling due east. Just...
- Q The figure below shows an object with a mass of m= 3.00 kg that starts from rest at point A and slides on a track with negligible friction. Point A...
- Q A 618-kg elevator starts from rest and moves upward for 3.80 s with constant acceleration until it reaches its cruising speed, 1.83 m/s.(a) What is the average power of the...
- Q An ideal spring of negligible mass hangs vertically at equilibrium. You find that if you gently attach a 796-gram mass and allow the spring to stretch very slowly downward, the...
- Q A 68.5-kg athlete leaps straight up into the air from a trampoline with an initial speed of 8.1 m/s. The goal of this problem is to find the maximum height...
- Q A piano with a mass of 126 kg is lifted 10 m above the ground in 4 s by a crane. What is the power used by the crane, measured...
- Q A 10.0-kg shell is traveling horizontally to the right at 25.0 m/s relative to the ground when it explodes into two fragments, one of mass 3.00 kg and the other...
- Q A shell explodes into two fragments, one fragment 25 times heavier than the other. If any gas from the explosion has negligible mass, thenA. the momentum change of the lighter...
- Q A 1.2-kg spring-activated toy bomb slides on a smooth surface along the x-axis with a speed of 0.50 m/s. At the origin 0, the bomb explodes into two fragments. Fragment...
- Q A 2.9 kg flower pot falls from a window ledge 11.0 meters above the sidewalk. What is the pot's velocity just as it hits the sidewalk? Remember that PE at...
- Q A student with a mass of 65 kg runs up a staircase as shown.What is the work done against gravity?*use 10 m/s for gravity*A. 780 JB. 455 JC. 7800 J
- Q In which of the following scenarios is NO work being done? Choose all that apply.A. walking VERY slowly up the stairsB. carrying a tissue boxC. pushing on a brick wall...
- Q A sled of mass 30.00kg is pulled by a force of 60.00N making an angle of 25.00 degrees with the horizontal direction. The sled moves through a distance of 20.00m....
- Q Dasher and Dancer use 1,349 N of force to pull Santa's sleigh out of the barn, traveling 8.5 meters. If it takes 23.6 seconds, how many watts of power are...
- Q A 200 kg boulder rests on a cliff at 1000 m on a mountain side. If the boulder falls then what is the: a. expected kinetic energy just before it...
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