How much force does a 15-kg leg exert during running if the person has a 2-m stride and runs at a speed of 8 m/s?

Q: Why is overall stopping distance for cars less than lorries

A: Stopping distance depends on , frictional force acting on the tire by the ground. Normally it does…

Q: a man in a sled, with a total mass of 125kg slides down a grassy hill and reaches a speed of 8 m/s…

A: Total mass of man and sled, m=125 kg   The velocity of man and sled at the bottom, u=8 m/s   The…

Q: A 1500-kg car traveling 65 km/hr can come to a stop within a distance of 25 meters when the brakes…

A: We need to calculate the friction force acting on the 1500-kg car.

Q: A rope is tied to two posts 6 meters apart. A block having a mass of 20kg was hanged at the middle…

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Q: A warning sign inside an elevator of mass 361kg indicates that the maximum load that it can carry is…

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Q: How fast will it be going when it hits the ground

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Q: When you parachute, you hit the ground with the same speed as free falling from a height of 4.5m,…

A: From equation of motion we know that v2= u2+ 2as . During freefall condition using initial velocity…

Q: An object at rest may have __________. hint:g=10m/s/s. a. speed b. velocity c. acceleration…

A: An object at rest does not have speed or acceleration.

Q: A total of 4900 J is expended in lifting a 50 kg mass

A: Given.  The energy expanded, E = 4900 J mass, m = 50 kg

Q: A grocery bag can withstand 300 N of force before it rips apart. How many kilograms of apples can it…

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Q: If a 25 kg bike is pushed from rest with a force of 15 N moving at 12 m/s, how far did it travel?

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Q: Calculate the force needed to bring a 450-kg canoe to rest from a speed of 10.8 km/h in a distance…

A: Given problem is based on the laws of kinematics. As we know that the kinematical equations are very…

Q: I want to check the answers of this question especially when does the weight first reach its maximum…

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Q: A 400 kg car moving at 30m /s breaks to a stop in 100 meters. The average frictional force (in…

A: Using kinematic equation, the expression for find acceleration is v2=u2+2ada=v2-u22d Substitute…

Q: A pitcher claims that he can throw a 0.145 kg baseball with as muchmomentum as a speeding bullet.…

A: Given data:  Mass of baseball (m1) = 0.145 kg Mass of bullet (m2) = 3.00 g = 3.00×10-3 kg Speed of…

Q: A stalled 1,000 - kg car needs a push. Starting at rest, how hard do   to get it up to 10 m/sec in…

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Q: If two -6 uC experience a force of 0.03 C/m, how far are they from one another?

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Q: You push a 12 kg block with a force of 32 N for a distance of 4.1 m. If it started from rest, how…

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Q: A load of 54 N attached to a spring hanging vertically stretches the spring 7.5 cm. The spring is…

A: Given data: Force, F = 54N   m =7.5cm=0.075m   Amplitude, x = 10cm =0.1m

Q: A 2-kg mass starts from rest and slides down an inclined plane 80 cm long in 0.5 s.

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Q: When you push horizontally on a crate on a level floor that doesn’t slide, how great is the force of…

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Q: A 4.8-m-long rope of mass 1.8 kg hangs from a ceiling.

A: The rope has mass M = 1.8 kg and length L = 4.8 m. It is suspended vertically so the tension in it…

Q: A ball of mass 0.8 kgs is dropped from a height of 10.4 m. Calculate its velocity at a height 2.7…

A: Take the downward direction to be positive. The equation of motion is given by, v2=u2+2as Here, v is…

Q: A stack of four textbooks sits on top of a desk. The mass of the bottom book is 5.0 kg, on top of…

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Q: How much does a 0.25kg apple have with an acceleration of 9.8m/s

A: Given data:  Mass (m) = 0.25 kg Acceleration (a) = 9.8 m/s2 Required: Force (F)

Q: How much tension is in the spring?

A: Explanation and answers of each part is in next  step.

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

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Q: Why friction is needed?

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Q: A man in a sled, with a total mass of 125 kg, slide down a grassy hill and reaches a speed of 8 m/s…

A: Given: Mass of man and sled , m = 125 kg Initial speed, vi = 8 m/s Final speed, vf = 0 Force exerted…

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: on a mountainside that slopes kg sled up the slippery inclin of kinetic friction is 0.100. an exert…

A: A camp is on the mountainside that slopes 300 and sled up the mass of m = 200 kg, the coefficient of…

Q: A woman skis from rest a downhill of 65 m high. If the friction is neglected, calculate her speed in…

A: Energy conservation: As we know energy can neither be created nor destroyed it can only be converted…

Q: A spring with a spring constant of 0.70 N/m is stretched 1.5 m. What was the net force?

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Q: What is the acceleration of a 600,000 kg freight train, if each of its three engines can provide…

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Q: A 3 KG hammer is 0.4m high. What is it’s PE? What is it’s KE?

A: Potential energy is given byP.E=mghwherem=mass of objectg=acceleration due to gravityh=height of…

Q: A machine gun fires 8 bullets /s, each of mass 10 g the speed to each bullets is 15 cm/s them force

A: given,v=15 cms=0.15 msM=10 g=0.010 kgn=8 bullets per secondt=1 secondno of bullets=?

Q: can an object move even when no force acts on it ?

A: According to Newton’s first law of motion, an object remains in its state of motion if there is no…

Q: Why can small creatures fall considerable distances without injury ,while people need parachutes to…

A: The concept for the above phenomenon lies in the difference in the surface area to mass ratio of the…

Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!