What is the use of lever if its mechanical advantage is (a) more than 1 (b) equal to 1 (c) less than 1.

Q: A pair of knife has its blades 15cm long, while its handles are 7.5 cm long. Calculate its…

A: Given: Load arm = 7.5 cm Effort arm = 15 cm. Solution: Mechanical advantage of a lever is the ratio…

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

A:

Q: How can Work, energy and Power of the Human Body be applied in health sciences?

A: We know that the energy is a quantity that changes it state, and this energy is further used to do…

Q: A hammer having a mass of 1 kg going with a speed of 6 m/s hits a wall and comes to rest in 0.1 sec.…

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Q: A force of 50 N is applied to the end of a lever, which is moved a certain distance. If the other…

A:

Q: levers are classified into three classes according to muscle force All fulcrum point weight

A: Levers are classified into three classes. These are given as, Class 1 Class 2 Class 3

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: If an input of 100 J in a pulley system increases the potential energy of a load by 60 J, what is…

A: Given that Input energy = 100 J Output energy = 60 J

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: If an input force of 202 N is applied to the handles of the wheelbarrow with a mechanical advantage…

A: The input force applied to the handles is, The mechanical advantage of the wheelbarrow is,

Q: A machine does 230 J of work in 30 seconds. Find the power of the machine?

A: Introduction :  In this question we are provided it value of work and time . With these data we have…

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: The rate of doing work is known as

A: In physics, the rate of doing work is known as Power. It is equivalent to an amount of energy…

Q: A force of 50N is applied to the end of a lever, which is moved a certain distance. If the other end…

A: Step 1Force that is applied to the end of a lever isTo find the force exerted when the other end of…

Q: If the box has a weight of 1200 N and JimBob had to apply 500 N of force to push it up the inclined…

A:

Q: speed is

A: Given; Earth revolves round the sun in an elliptical orbit,  Its speed is?

Q: How much force was needed?

A: .Given data: Work W= 245J Distance d= 15m

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 does it mean to say something is in mechanical equilibrium?

A: Equilibrium is a state of system, which remains same throughout the time in reference to a…

Q: the force exerted by a machine is called the ____ A. effort force B. resistance force C.…

A: Please see the answer in step 2.

Q: An object of mass 8 kg falls form the top of a building 84 m high. What is its kinetic energy (in…

A: Given: The mass of an object is m=8 kg. The initial height of building is h1=84 m. The final height…

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

A: GivenInput energy = Output useful energy

Q: What is the work done on an object 32.5 kg to move it up a 20 degrees incline?

A: Given data: The mass of the object is m=32.5 kg The angle is θ=20°

Q: The total length of a first class lever is 9.0 ft. This is used to move a load of 390 lbs, as…

A: givenTotal length of first class lever=9 ftload=390 lbs

Q: What is the total mechanical energy

A: Since there is no friction Total energy will conserved Total energy at A = Total energy at B

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

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Q: In an input of 100J in a pulley system increases the potential energy of a load by 60J , what is the…

A: Given:Input energy = 100 JOutput energy = 60 J

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

A:

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: In raising a 6000 N piano with a pulley system, the workers note that for every 3 m of rope pulled…

A:

Q: Mechanical energy is the sum of

A: Required : Mechanical energy is the sum of..

Q: Is power a scalar quantity?

A: Power is a scalar quantity. A quantity which depends on direction a vector quantity. A quantity…

Q: Match each type of simple machine with its example. 1. wedge a. doorknob b. chisel 2. wheel and axle…

A: 1. Wedge - chisel (both have one thick end and one pointed end) 2. Wheel and axle - Doorknob (same…

Q: Show that a machine that has an input of 100 J and an output of 40 J is 40% efficient.

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Q: In the figure, the rock weighs 210 Ib and is lifted 1 ft by the lever. F Fulcrum 3F

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Q: What type of simple machine is a flight of stairs? O pulley wedge inclined plane lever

A: A Simple Machine is a machine which helps in changing the direction of application of Force or in…

Q: Your pulley system has 4 support ropes. You can pull down with 7 N of force. How much can you lift?

A: Given, No. of support ropes supporting pulley system, n=4 Force exerted at bottom , Fpull=7N To…

Q: What is the power done by gravity to make a ball of mass 0.68 kg roll from 1.3 m above the ground to…

A: Power = Energy/time P=E/t E=mgh m=0.68 kg h=1.3 m  g=9.8 m/s^2   E=0.68*1.3*9.8 = 8.6632 J t=2.68 s

Q: Jack weighs 65 kg. What is Jack’s height of jump if he exerts a normal force of 1300 and his center…

A: This question can be solved by breaking down the boy's motion into two parts. The two images below…

Q: the working of a spring scale is based on Newton's law . true or false

A: To Determine The working principle of Spring Scale

Q: An object of mass m= 4kg placed on a frictionless, horizontal table is connected to a string that…

A: Given :- The mass m1 = 4 kg  The mass m2 = 9 kg  The mass arranges in the wavy shown in the figure.…

Q: what is the significance of the “rise” and the “run “and their ratio?

A: The distance measured in the up or down direction is known as the rise. The distance measured in the…

Q: One horsepower is equals to?

A: horsepower is refers to the power of an engine produces example for horsepower is electrical motors…

Q: If a person pushes a 2kg box with a force of 10N and a velocity of 10 m/s, what is the power?

A: Answer              100W