A car carrying a 75-kg test dummy crashes into a wall at 25m/s and is brought to rest in 0.1s. Show that the average force exerted by the seat belt on the dummy is 18,750N?

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: 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: 60 kg person walking at 1 m/sec bumps into a wall and stops in a distance of 2.5 cm about 0.05 sec.…

A: Given data: Mass (m) = 60 kg Initial speed (u) = 1 m/s Final speed (v) =0 Time (t) = 0.05 s Need to…

Q: Calculate the final speed of a 110-kg rugby player who is initially running at 8.00 m/s but collides…

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

A: Power = work/time

Q: A fast train bumps into a slow train going the same direcction, and they get coupled together.  The…

A: Given data: The mass of fast train is M = 20.5 tons The mass of slow train is m=19 tons The initial…

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: 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: Which of the two has greater kinetic energy?

A: Given data, Two cars A and B of masses 200 g and 500 g respectively. It is having same speed. Which…

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 skater with the mass of 60kg coasting with a speed of 5 m/s appraoches a ramp. How far up the ramp…

A: Mass of the skater,  Initial speed of the skater,  Acceleration due to gravity,    From the…

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

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Q: Calculate the minimum uncerta inty in the speed of a ball of mass 500 g that is known to be with in…

A: m=Massofbat=500 gΔx=Uncertainityinposition=5 μmh=Planckconstant=6.626×10-34 Js

Q: At the low point in its swing, a pendulum bob with a mass of 0.2 kg has a velocity of 5 m/s. How…

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Q: the impulse?

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Q: what accerleration does a baseball of mass of 0.55 experience when hit by a bat if 290 N are exerted…

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

A: For an ideal pulley system, the input work is equivalent to the output work. When the one end of the…

Q: A train car without a roof of mass 20,000 kg is moving on rails without friction with a constant…

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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…

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Q: Which requires more work- strectching a strong spring a certain distance or stretching a weak spring…

A: Let Ws is required work done for stretching strong spring and Ww is required work done for weak…

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

A: Answer:-  When the force acts on a tossed coin that has reached halfway its maximum height is 50%.…

Q: 60 N is required to compress a string in a hand exerciser by a quarter of a meter. Calculate its…

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Q: Its momentum is conserved, because there is no net force acting on it. Its kinetic energy is…

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Q: After a tornado, a 0.55-g straw was found embedded 2.3 cm intothe trunk of a tree. If the average…

A: Given,F = 65ma = 65a = 65m= 650.55 x 10-3 = 118181.8 m/s2

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

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Q: A 25kg cart moving at 4 m/s has how much momentum?

A: The momentum of a body is the product of its mass and velocity. p=mv…

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: In a vertical jump-and-reach test, 60 kg Emma jumps 60 cm, while 90 kg Salma jumps 45 cm. Assuming…

A:

Q: how does the KE change if a car's mass changes by a factor of 1/3 and changes it's speed by a factor…

A: Let the mass of a car = m Let the initial speed of car = v The initial kinetic energy is given by :k…

Q: A ball going 20 m/s bounces off a wall at a velocity of -12 m/s and goes the opposite direction. If…

A: Answer: Given data, Initial velocity of ball (u)=20m/s Final velocity after bounce back (v)=-12 m/s…

Q: A machine gun fires 4 bullets /s, each of mass 10 g the speed to each bullets is 6 cm/-1 then force…

A: Given data :                       Mass of each bullet    =   m                       Number of…

Q: A child sits in a wagon with a pile of0.34-kg rocks. If she can throw each rock with a speed of 9.5…

A: The expression for Linear momentum,

Q: A 50 kN truck travelling with a speed of 50 kph hits a lamp post and is brought to rest in 0.1 secs.…

A: The weight of the truck, W=50 kN=50000 N   The mass of the truck, m=Wg=50000 N9.81 m/s2=5096.84 kg

Q: Find the velocity of a 10 kg ball if it has 400 Joules of kinetic energy

A: Given: The mass of the object is 10 kg. The kinetic energy of the object is 400 J.

Q: Sammy uses a pulley to hoist a crate 10 meters high in 5 seconds. Sammy applies 980 N of force to…

A: Force (F) = 980 N  Displacement (S) = 10 m  time (t) = 5 sec

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: A man pushes a lawn mower on a level lawn with a force of 189 N. If 28% of this force is directed…

A: Given data *The given force is F = 189 N *The given time is t = 16 s *The displacement is d = 5.5 m

Q: A small block of mass 70g is given a kick on a frozen pond. The kick imparts to it an initial speed…

A: Given:- mass of block = 70 g = 0.07 kg initial velocity, u =8m/s the distance, s= 10m

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: Calculate the final speed of a 110-kg rugby player who is initially running at 8.00 m/s but collides…

A:

Q: Two cannons are moumod as shown in the dewving and niggod to fire simulianeousiye They are used in a…

A: clown A; angle = 75 degree speed = 9 m/s   Horizontal separation between clowns = 6.00 m

Q: A 0.6 ton motor is moving on a le way at a speed of 108 km/hr. How retarding force (in Newton) is…

A: Given : m = 0.6 ton = 600 kg vo = 108 km/hr = 30 m/s s = 0.007 km = 7 m

Q: • A farmhand pushes a 26-kg bale of hay 3.9 m across the floor of abarn. If she exerts a horizontal…

A: Expression of work done -  W=F×sWhere,F = Force s = Distance

Q: Calculate the final speed of a 110kg rugby player who is initially running at 8.00 m/s but collides…

A: Given that  mass m is 110 kg. initial speed is 8.00 m/sec  . a backward force of 1.76×104N for…

Q: A ball is dropped from a height of 1.60 m and rebounds to aheight of 1.20 m. Approximately how many…

A: Given: Dropped height, h=1.6 m Rebound height, hr=1.2 m Energy lost =90%=0.9

Spring Potential Energy

The potential energy is the energy possessed by a body by virtue of its position or the energy held by the object due to its position relative to other objects, its force like stresses, charge, and other factors affecting the particles of the body. The potential energy is the measure of the net work done by or on the body. The spring potential energy is the potential energy stored due to the deformation of an elastic spring and this elasticity is due to the stretched spring. The elasticity is the ability of a solid-state matter to come back to its equilibrium position or original position after any kind of external force is acted on it. It is also known as Elastic potential energy. The potential energy here is caused due to the displacement of the spring from its equilibrium position to another position and this potential energy is equal to the net work done due to the stretching of the spring. It also resembles the same mechanics of the oscillation of a simple pendulum, where due to the external force, the object moves from its equilibrium position to its maximum ends and the periodic motion continues till it comes back to the equilibrium position to rest.