1. The charge per unit length on the thin semicircular wire with total charge 'q' shown below is A. What is the electric field at the point P located distance 'r' from every part of the semicircular wire? X

Q: Can there be a net force on an object and have no work done to it? Defend your answer.

A: let the net force acting on the object be "F"  and displacement of the object due to this force is…

Q: 50 W of power is required to to lift a barbell in 5 sec, How much work is done?

A: Power delivered on the system is equal to rate of work done on the system.

Q: A ball of 25 kg is released from a height of 100 meters, what is the speed when it reaches the…

A: Given : mass of the ball, m = 25 kg              height, h = 100 m

Q: A compact car can climb a hill in 10 s. The top of the hill is 30 m higher than the bottom, and the…

A: Calculate the potential energy of the car at the top of the hill. PE=mgh    =1000 kg9.81 m/s230 m…

Q: A boy sees a rope swing and runs at it, grabbing the rope and swinging on it. If the boy was running…

A: Given: Speed of the boy v= 4.5 m/s      To calculate: How high he would swing

Q: What Power is expended by 100 Newtons of force applied to an object for 5 meters in just 2 seconds?

A: Work done by the 100 N force for moving the object by a distance of 5 m, W=F·dW=100 N5 mW=500 J

Q: How much work is required to lift a 6.9-kg backpack 1.9 m to put it on?

A: mass(m)=6.9 kg displacement(d)=1.9 m g =acceleration due to gravity=9.80 m/s2

Q: baseBall A has a mass of 50 kg and is raised to a height of 5 m. baseBall B has a mass of 100 kg and…

A:

Q: An object has kinetic energy of 74J. If its speed is 5.2 m/s, waht is its mass? Gravity is 9.8ms and…

A:

Q: A piano with a mass of 137 kg is lifted 10 m above the ground in 5 s by a crane. What is the power…

A: mass of piano m = 137 kg height lifted h =10 m time t=5s

Q: ben  lifts a 1000 N bar 1.5 m in 1.0 s, while ken lifts a 1300 N bar 2.0 m in 2.5 s. Whose lift was…

A:

Q: A man who has a mass of 80 kg can run up a flight of stairs of 20 steps, in 5 seconds. Given that…

A: Given: The mass of the man is 80 kg. The number of steps covered by man is 20. The height in each…

Q: If you pick a mass of 11.2 kg from the ground up to 0.73 m above the ground and it takes 1.56 s to…

A: Given data:  Mass (m) = 11.2 kg Height (h) = 0.73 m Time (t) = 1.56 s Required: Power (P)

Q: A 1-kg object is dropped from a he ight of 100 m. What is its potential energy?

A:

Q: A jump can push water at a height of 8 m at a rate of 2 kg/s. What is the power outpu

A: We know thatP=Et                      (1)WhereP=PowerE=Energyt=time takenEnergy is equal to…

Q: ow much power (in kW) is required to raise an elevator with a mass of 1,722 kg at a rate of 54…

A: Given values:- Mass of the elevator,(m)=1722 kg -----(1) Rate,(v)=54 m/min=0.9 m/sec ------(2)…