What is the kinetic energy of photoelectron (in terms of keV) ejected from K-shell of a lead (EB=82x keV) By photo electric absorption of a photon of 200 keV?
Q: A drag racer is slowed by a parachute. What is the sign of the work done?
A:
Q: How fast must be the 4.0 kg basketball thrown upward to achieve the same potential energy of 160 J?
A: Given: The mass of the object is 4 kg. The potential energy of the object is 160 J.
Q: If the signs are reversed, why would there still be negative work when the positive and negative…
A: when sign of the charges are reversed -Q becomes +Q, -Q becomes +Q +Q becomes -Q
Q: Work-done and power sent by them?
A: Given, Compare the workdone and power sent by the girl A and boy B,Where, Girl take 45 sec to climb…
Q: 1. A graph of velocity versus time for a hockey puck shot into a goal appears as follows: Which of…
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Q: Does it take any work to push an object that does not move? Explain.
A: Work done is defined as product of displacement and force acting along displacement.
Q: Calculate the kinetic energy of a 226. mg raindrop moving at a speed of 3.4m/s. Round your answer to…
A: The objective of this question is to calculate the kinetic energy of a raindrop given its mass and…
Q: Find the work done by non conservative friction forces. Weight of the ball = 400 grams Initial…
A: Work done on a body is given by the net change in the energy of the body. Initial energy of the ball…
Q: How much work is done by a shopper in pushing her grocery cart by a force of 325 N througl 24.70 m?…
A: We know formula Work = force * displacement given , force = 325 N , displacement =24.70 m Work =…
Q: State the energy changes in the following cases: (a) loudspeaker (b) burning coal (c) bio gas burner…
A: Answer-aIn case of loudspeaker the electrical energy is transformed into sound energy in the form of…
Q: What power output is required of a motor that needs to lift a 450 kg elevator car 12 meters in 8.0…
A:
Q: Ellie is pushing a rolling bag at 40o with a force of 350 N and able to displace her bag by 2800 mm,…
A: The angle is Φ = 40o Force is F = 350 N Displacement is S = 2800 mm = 2.8 m
Q: Write down a relation connecting potential energy and force.
A: Relation connecting force and potential energy is,
Q: Can the normal force on an object ever do work? yes no
A: Yes sometimes Normal force also do works on an object.
Q: ad cars, each 2 106
A: Given: Mass (m1) is 2.75×104Kg and velocity can be 3.4 m/s. 2 cars, same mass and m2 is 5.5×104Kg…
Q: Problem 5: A horizontal force of magnitude 19.9 N pushes a box along a horizontal floor at a…
A: Given value--- force = 19.9 N. constant speed = 6.99 m/s. We have to find--- power ?
Q: How do I calculate energy used in my compression spring ping pong ball launcher? Please show an…
A: Energy used in the compression of spring ping ball launcher stored in form of the potential energy…
Q: Calculate the work done by a 40 N force pushing a 0.5 kg toy 2.3 m.
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Q: A 70 lb child runs uphill, gaining 50 feet in elevation in 14 seconds. Calculate the average power…
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Q: ive an example equation for an egg picking up speed from 2 feet in the air down a hay filled ladder…
A: When an object of mass m is drop from height h then it is initially at rest which is having a…
Q: How much work was done by the person against Gravity?
A: Initially the center of mass is at a height, The center of mass ends at a height of
Q: In 1953 two climbers, Hillary & Norgay, made the first successful ascent of Mt. Éverest. How many…
A: Height of Mt. Everest, h = 8,848.86 m Gravitational energy of climber at top, U = mgh =…
Q: A firefighter slides down a pole with constant speed. What can you say about the energy?
A: Firefighter is slifing down tbe pole with constant speed.We know that potential energy is given by…
Q: A learner weighing 800N runs up 20 stairs each 20cm high in 4s. How much power is exerted by the…
A: Lerner weighing= 800 N Total displacement= 20×20= 400 cm= 4 m Time= 4s
Q: How far must a 5 N force pull a 50g toy car if 30 J of energy are transferred?
A:
Q: If a force of 1000 N moves a 40-m object in a time of 5.0, find the power generated by this force.…
A: Given data: Force (F) = 1000 N Displacement (d) = 40 m Time (t) = 5.0 s Required: Power (P)
Q: An acorn falls from
A: Kinetic energy = (1/2) mv2 Potential energy = mgh
Q: A roller coaster is stuck at the top of a 72 m hill and has a mass of 134 kg. Does the roller…
A: Height of hill: h = 72 m Mass of roller coaster: m = 134 kg
Q: A student who weighs 545 N climbs a stairway (vertical height of 4.3 m) in 30 s. What is the power…
A: The work done by the student is,
Q: How much work is done? when 50N of force move a box through a distance?
A: Given, Force = 50 N
Q: How much work is done by the boy pulling his sister 29.0 m in a wagon as shown below? Assume no…
A:
Q: In which of these situations is work being done? A B C D You sit in a chair reading your textbook.…
A: Solution: Given: In which of these situations is work being done? A. You sit in a chair reading your…
Q: The jetski has a mass of 200 kg and a speed of 20 m/s. How much work will it take to stop it?…
A: Given value--- Mass = 200 kg. initial speed = 20 m/s. final speed = 0 m/s. We have to find---…
Q: A 2.82 kg object is dropped, from rest, from a height of 24.4 m above the ground. Assuming…
A:
Q: A 65 kg track star can get to her maximum speed of 8.5 m/s in 2.8 seconds. Calculate her power while…
A: Mass of track star,(m)=65 kg -----(1) [Given] Maximum speed of track star,(v)=8.5 m/sec -----(2)…
Q: State the work-kinetic energy theorem in a few lines.
A: State the work-kinetic energy theorem.
Q: A 80.0 kg mail bag hangs by a vertical rope 3.5 m long. A postal worker then displaces the bag to a…
A:
Q: A 50 kg sack of rice was raised to height of 1.2 meter by the delivery boy to the car’s roof, find…
A:
Q: is a person climbing a ladder potential or kinetic energy?
A: We know that energy can neither be created nor destroyed. However, energy can always change its form…
Q: A 1200 kg car is moving at 30 m/s and slows down to 20 m/s. Find the work done on the car.
A: From work-energy theorem the work done on/by an object is given by the change in its kinetic energy.…
Q: Joule is a unit of the following: work, power, potential energy, and kinetic energy, true or false?
A: Work: Work = Force ×Displacement W = F ×S Units of work: 1 J = 1 N m Power: Power = Work…
Q: A horizontally directed froce of 30 N is used to pull a box a distance of 2.5m across a tabletop.…
A:
Q: -50 kg PE- PE- PE- KE- KE KE ME ME- 3 m v6 ms
A:
Q: A 510 kg elevator accelerates upward at 1.5 m/s? for the first 11 m of its motion.
A: solution is given as
Q: Calculate the kinetic energy of a 0.15 kg baseball moving at a speed of m 39.0 ". Round your answer…
A:
Q: KE, m, X, m, az m, -A bomb of mass 9 kg explodes into two fragments ofmasses 3 kg and 6 kg. The…
A:
Q: Work requires O motion. O zero net force. O zero momentum. a force perpendicular to the direction of…
A: Solution: If a force F is acting on the body and there is a displacement s of the body in the…
Find the kinetic energy.
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