If a star 10 parsecs away from us was moved and appeared to be 4 times brighter after movement, how many parsecs is the star away from us now?
Q: Work done When the direction of the force is in the direction of the displacement When the direction…
A: The work done by the object is expressed as follows. W=F·d Here, F is the force and d is the…
Q: A car uses a power of 100 W within 25 seconds to operate. What is the work done?
A: Write the given values with suitable variables. P=100 Wt=25 s Here, P denotes the power and t…
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: How does doubling the diameter of a cylinder affect its output force?
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Q: Differentiate between work and power.
A: Work and power are two important concepts of mechanics. Both are scalar quantities.
Q: What is the minimum work that a motor must do to lift a 50 lb object from the floor to a height of…
A: CONCEPT: We know, work done = force x displacement So, work done W=F×d Where,…
Q: What is the cost of operating a 5.00 W electric clock for a year if the cost of electricity is…
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Q: what is the power used in this exercise?
A:
Q: Work is energy transferred by
A: Work is done on an object when energy is transferred to the object whereas work is done by an object…
Q: What is the maximum amount of work that a 600-W motor can do in 10 seconds?
A:
Q: How much power does it take to lift a 49kg person a 5m vertical distance in 20s?
A: Given: mass, m = 49 kg height, h = 5 m time, t = 20 s
Q: Why is the unit of work and Joule dimensionally the same as newton-meter?
A: The unit of work is Joule. Work done, W = Force × displacement W = F × dUnit of force is Newton.…
Q: How much work is required to increase the kinetic energy of a motor scooter by 4000 J?
A: The objective of the question is to find out the amount of work required to increase the kinetic…
Q: Energy is
A: Energy is defined as the work done by an object or rather the quantitative property needed by an…
Q: When a body moves in a circular path, how much work is done by the body? Give reason.
A: The magnitude of work done by a force F with a displacement d is given by
Q: The two ways we can move energy around are called and
A: there are two ways we can move energy around- 1) Electrically- by electrically process energy move…
Q: Where does the work done go during the stretching of a wire?
A: Step 1Work done by a body is the measure of energy transfer when a force moves it through a…
Q: A person who weighs 80 pounds walked up two flight of stairs in 5 minutes. Each flight of stairs has…
A: The expression for find work is W=F·d Substitute values in the above equation…
Q: Why is a hydro turbine more efficient than a hydro pump?
A: Hydro turbines and hydro pumps have different functions within the context of hydropower systems,…
Q: Calculate the average power required to raise a 140 kg drum to a height of 15m in 1 minute
A: The potential energy at a height h is P.E=mgh…
Q: A force of 49 N raises a 5 kg object 0.82 m upwards. How much work was done by the force?
A:
Q: A casting of mass 150 kg is lifted 4 meters in 15 seconds by means of a crane. What is the power?
A: Given, Mass, m=150 kg Height, h=4 m Time, t= 15 s Take, acceleration due to gravity, g=10 ms-2 The…
Q: How much work would have to be done to bring a 980-kg automobile traveling at 87 km/h to a stop?
A: Mass of the automobile = 980 kg Speed of the automobile = 87 km/h…
Q: Which of the following is not a unit of power? O J/s O N'm O horsepower Watts
A:
Q: ladder is raised to a vertical position Compute the work done by the force lifting the ladder. The…
A: Weight of ladder, Length of ladder, The ladder is raised to…
Q: What role does friction play in the conservation of energy?
A: Friction - When surface of one object moves on the surface of other object then a resistive force…
Q: A 26 meter chain is hanging from a winch located 26 meters above the ground. If the chain weighs 4…
A: Basic: we know that the work done is given by force into. Displacement so we just find the small…
Q: Name some physical quantities that are universally conserved.
A: The four physical quantities that are universally conserved are
Q: How much net work must be done to accelerate a 1000 kg 20 m / s to 30 m / s?
A: According to the work energy theorem, the work done must be equal to the change in kinetic energy.…
Q: A force of 49 N raises a 5 kg object 0.61 m upwards. How much work was done by the force?
A: Applied force (F) = 49 N Mass (m) = 5 kg Distance moved (d) = 0.61 m (upwards)
Q: How much work is done on a 20 kg crate that is hoisted 2 m in a time of 4 s?
A:
Q: Power is expressed by which of the following units?
A: Solution
Q: How much work is done in lifting your classmate with a mass of 72kg 1.3m off the floor?
A: Given: The mass of the classmate is 72 kg. The distance is 1.3 m. To determine: The work…
Q: anet with a net force of 250 now all work, including the
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Q: A roller coaster is at the bottom of its hill it has
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Q: A uniform cable hanging over the edge of a tall building is 80 ft long and weighs 45 lb. How much…
A: Workdone = 787.5 lb ft
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