Some racetracks use "compression barriers" some of the energy of the impact when a car racecar hits the guardrail at a speed of 70.0 spring constant of 73.5 kN/m, what length w the car? M = 1500 ky V = 70 Ado?

Q: 2. A 2.70 kg block starts from rest and slides a distance d down a frictionless 32.1° inclined…

A: Mass of the block m=2.7 kg and angle of incline is 32.1o. The block starts from rest (u=0) and comes…

Q: If the signs are reversed, why would there still be negative work when the positive and negative…

A: when sign of the charges are reversed  -Q becomes +Q, -Q becomes +Q +Q becomes -Q

Q: 10. Who is working harder, Fred running a 10 min mile pace at a 10% grade Pete who is 65 kg, cycling…

A:

Q: Give an example of a frictional force doing positive work

A: Frictional force: This force is act between two rough surface while movement. The frictional force…

Q: A spring with a spring constant of 1.0 N/cm is attached to a 4.0 kg mass. If you were to pull and…

A: Given:- The spring constant of the spring is k = 1.0 N/cm = 100 N/m The mass attached to the spring…

Q: Does the work you do on a book when you lift it onto a shelf depend on the path taken? On the time…

A: Work done

Q: From an applied "hands-on" point of view

A: First we talk about conservation of energy so,the ball is jumped in the high level of the ground and…

Q: energy supplied by such a diet each second, and hence the person's average power. (Give your answer…

A: The energy needed for the person per day, E=10 MJ We know that,  I day=24 h=24×60×60 s=86400 s The…

Q: Which do you think requires more power: moving up stairs at a slow speed (ex: walking) or moving up…

A: Let’s get this out of the way first: energy is a scalar quantity an its units are joules.…

Q: In physics, what conditions must be satisfied if work is to be done?

A:

Q: 16. A 170 pound man wants to design a workout (on a treadmill) that will expend 300 kcal. He wants…

A:

Q: How can the total energy remain the same,but the energy available to do work decrease?

A: The system's total energy is conserved means that that the energy can not be created or destroyed.…

Q: A water tower stores not only water, but (at least part of) the energy to move the water. How much?…

A: A water tower is used to supply water to a city or an area in a city for daily household usage. A…

Q: Calculate the power if 814 Joules of work gets done in 10 seconds

A: Given Data: Work Done, W = 814 Joules Time, T =10 seconds

Q: Is work done whenever a force is exerted? Explain.

A: Force F is applied to body to displace it from one position to another position, then work done on a…

Q: How do I calculate energy used in my compression spring ping pong ball launcher? Please show an…

A: Energy used in the compression of spring ping ball launcher stored in form of the potential energy…

Q: How to solve this problem using the energy method? Like with potential energy and kinetic energy?

A: The expression of the speed from conservation of energy,

Q: What is the difference between when work is done by a system and when work is done on a system

A:

Q: List the energy conversions that occur when riding a bicycle.

A: In riding a bicycle

Q: In 1953 two climbers, Hillary & Norgay, made the first successful ascent of Mt. Éverest. How many…

A: Height of Mt. Everest, h = 8,848.86 m Gravitational energy of climber at top, U = mgh =…

Q: A firefighter slides down a pole with constant speed. What can you say about the energy?

A: Firefighter is slifing down tbe pole with constant speed.We know that potential energy is given by…

Q: Can You write a conservation of energy equation with all the energies involved in a mouse trap car?

A: In a mousetrap car, as explained in the previous problem, The energy input from the mousetrap spring…

Q: can a potential energy be negative? or it should always be positive?

A: Potential energy can be positive , zero or negative . It is a relative term which depends on…

Q: Final Y = (3 m)sin 37° y= 15 ms X-0 K; + , + U + W - K, + g,* y + AEtbem Initial m= 60 kg X- 3,0 m…

A: Mass = 60 kg  Initial compression = 3 m  Final launch speed = 15 m/s

Q: Explain, in terms of the definition of power, why energy consumption is sometimes listed in…

A:

Q: 20. How many kcal does a 155 pound man expend when he rides a Monarch bicycle ergometer at 150 Watts…

A: Given value--- power =150 Watt. time = 20 min. We have to find--- expend energy?

Q: 2 people of the same mass climb the same set of stairs. Person A climbs the stairs in 25s. Person B…

A: Part (a) The work done does not depends on the time taken by both the people. The expression for…

Q: 17) Under the influence of a fore, an object of mass 4 kg accelerates from 3 m/s to 6 m/s in 8…

A:

Q: if you push a fridge with 20N force for a 5m distance, how much work did you do? (ignore friction)

A:

Q: . Is it possible to do work on an object that remains at rest?

A: Work

Q: What do you think is the difference between the everyday usage and the Physics usage of the phrase…

A: Conservation of energy : it's states that not the energy will create nor the destroyed. Only it's…

Q: I do not need the solution to the question. Just let me know why in this question conservation of…

A: Conservation of energy is only applicable for elastic collision.

Q: You observe a car of mass 500 kg, moving at speed 5 m/s, collide with a 100 kg trailer that was at…

A:

Q: 3. Two blocks of masses ma = 2.90 kg and ms = 6.30 kg are connected by a light string that passes…

A:

Q: How can we ignore the self-potential energy when doing a work-energy problem or an…

A:

Q: How much work is done in completing one rep of 50 kg on a bench press ( holding the bar, lowering…

A: Expression for work done -  W=F×S ..... (1)Where, W =Work done F =Applied force S =Displacement…

Q: X A 10 Kg object is raised to a height of 2m in 5s. What is the rate of work done? * 10 『- 10%メ 10…

A: Given, mass of an object, m = 10 kg height above the ground, h = 2 m time taken, t = 5 s

Q: When a driver applies the brakes to keep a car going downhill at constant speed and constant kinetic…

A:

Q: 12. If a 70 kg man is riding a Monarch ergometer at 50 rpm and the resistance is 3.0 kg, what is the…

A:

Q: Common misconceptions about energy: (With Explanation) 11. The terms "energy" and "force" are…

A: We have to explain the misconception with example that the words energy and force are not…

Q: 1. Why are we more tired after running upstairs in a few seconds than after walking upstairs in a…

A: Power is the rate at the energy being transferred or  energy being converted from one form to…

Q: When can energy be transferred from one object to another?

A: Energy is the ability to do work. Energy is a conserved quantity and the law of conservation of…