When arm-wrestling, your arm is acting as: (a) a 1st-class lever. 1. (b) a 2nd-class lever. (c) a 3rd-class lever. (d) none of the above.

Q: For every action force there is what?

A: According to the newtons 3rd law of motion "For every action there is always an equal and opposite…

Q: What would happen to the speed of the stopper if you add more washers?

A:

Q: dropping an elephant and a mouse from a tall building, the mouse survived the fall but the elephant…

A: A mouse and an elephant dropped from same height.  We have to explain as to why mouse survived the…

Q: if the book fals of the shelf, what will be its speed when it hits the ground.

A: Every object has two types of energies. They are Potential energy and Kinetic energy. Potential…

Q: takes 8 seconds for a 30- kg girl to climb a 9 m high flight of stairs. How much horsepower is she…

A:

Q: An object only has mechanical energy when it is moving. True or False?

A:

Q: energy Comsemed in Jou Lx toostro of minertis 2 30

A: Solution:Consider the equation for power given as:Power = EnergyTimeApplying values in above…

Q: Nellie Newton applies a force of 50 N to the end of a lever, which is moved a certain distance. If…

A: It is given that

Q: If energy is never lost, why does the basketball you dropped eventually stop bouncing

A: Energy does not lost during bouncing.

Q: Show that 50W of power is required to give a brick 100J of PE in a time of 2s?

A: Power = work/time

Q: How much force acts on a tossed coin when it is halfway to its maximum height? How much force acts…

A: concept and Explanation -                                                  The net force acting on a…

Q: 17. What happens to the ball's kinetic energy (KE) and potential energy (PE) as it falls?

A: Potential energy is the amount of energy possessed by a body by its position in the surrounding. The…

Q: When does and object transform from kinetic to potential energy?

A: When does an object transform from kinetic to potential energy? Explain:-  kinetic energy:-…

Q: Energy stored in an object due to its position is        ["", "", "", ""]            potential…

A: Gravitational potential energy is energy in an object that is held in a vertical position, due to…

Q: What is the power done by gravity to make a ball of mass 0.6 kg roll from 8.9 m above the ground to…

A:

Q: A fisherman is about to reel in a 9-lb fish located 15 ft directly below him. If the fishing line…

A: Given, Weight of fish, w1=9 lb, height, h= 15 ft, and weight of line, wl=1 oz/ft=1516lb=0.94 lb.

Q: How much force acts on a tossed coin when it is halfway to its maximum height? How much force acts…

A: When a coin is thrown in upward direction, force experienced by the coin neglecting air resistance…

Q: Both a pair of scissors and a pair of pliers belong to the same class of levers, Name the class of…

A: A pair of scissors and a pair of pliers both belongs to class 1 lever.A pair of scissors has…

Q: Energy associated with the position of object is called ___ energy and is determined by its ___ and…

A: Answer            potential            mass          height

Q: In raising a 5000-N piano with the pulley system, the workers note that for every 2m of rope pulled…

A: The work is equal to the force time the distance.

Q: A railroad diesel engine weighs four times as much as a freight car. If the diesel engine coasts at…

A:

Q: A 50-kg sack is lifted 2 m in the same time as a 25-kg sack is lifted 2 m. The power expended in…

A: The equation for the power is given by

Q: the impulse?

A:

Q: a ball is just supported by a string without breaking. If it is set swinging, it breaks, why?

A: When a ball is tied to a string, it is free to do only circular motion with the help of the string.…

Q: A 70 Kg person walking at 1 m/sec bumps into a wall and stops in a distance of 2.5 cm in about 0.04…

A:

Q: Name the machine which is used to multiply speed?

A: There are three kinds of lever, first class lever, second class lever and third class lever.For the…

Q: What is the efficiency of the machine that miraculously converts all the input energy to useful…

A: GivenInput energy = Output useful energy

Q: if the book falls off the shelf, what will be its speed when it hits the ground.

A:

Q: :F = (10 – h)j, F,: 1 j. Bo (h + 1)2 Во- Erom om root ot h

A: Given, Mass m = 1 kg external forces F1→= (10 - h)j⏞ F2→ = 1h+12j⏞

Q: anet with a net force of 250 now all work, including the

A:

Q: In raising a 5000-N piano with a pulley system, the workers note that for every 2 m of rope pulled…

A: The equation for the work done is given by,

Q: Show that about 786W of power is expended when a 500-N barbell is lifted 2.2m above the floor in…

A: The work done in lifting a 500N barbell 2.2m above the floor is

Q: Name the physical quantity which is measured in terms of horse power.

A: Watt is the unit of power and Horse power is also a unit of power which is denoted as 'hp' .1…

Q: Does the KE of a car change more when it goes from 10 to 20 km/h or when it goes from 20 to 30 km/h?

A:

Q: Why is it tiring to push hard against a solid wall even thoughyou are doing no work?

A: Work done is given by W=F·s·cosθ where, F=Forces=Displacementθ=Angle between force and displacement

Q: Consider an ideal pulley system. If you pull one end of the rope 1m downward with a 50-N force, show…

A: Given data:Force, F1 = 50 N d1 = 1 mF2 = 200 N d2 = ?

Q: Nobody at the playground wants to play with the obnoxious boy, so he fashions a seesaw as shown so…

A: The picture shows the boy sitting on the board with the fulcrum being extremely close to him and…

Q: Which, if either, has greater momentum: a 1 kg ball moving at 2 m/s or a 2-kg ball moving at 1 m/s?…

A:

Q: Why is it advantageous to roll with the punch in boxing?

A: The impulse is the change in momentum of the object that acts upon it.

Q: The energy possessed by a body by the virtue of its position is called ______

A: We have to write the energy possessed by a body by virtue of its position.

Q: An empty train starts more quickly than a loaded train. Why?

A: On applying same force on two objects with different masses, object with smaller mass will…

Q: 0.14 kg baseball is d eight of 2.0 m above agnitude of its mome ound if we neglect a

A: Given that  Mass (m)=0.14 kg height (h)=2m Determine magnitude of momentum just before it hits…

Q: A 8000-N car is traveling at 50 km/h. It strikes a 12000-N car, which is stationary. The two cars…

A: According to conservation of momentum  Momentum before collision =momentum after collision