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1. A magnetic field can change the direction of motion of a charged particle yet in doing so it has done no work on the particle. Why? Give another example of a force causing an object to change direction without doing any work on it.
2. Explain why it takes more fuel for a spacecraft to travel to the Moon from Earth than it takes to travel from the Moon to the Earth.
3. In my last house, when I used to put the electric kettle on in the kitchen at the same time as the washing machine was on in the laundry and the electric heater was on in the lounge room the fuse would blow and all the appliances would stop working. Why did it do this? Explain using circuit diagrams.
A penny is dropped from a 500 ft high bridge what is the velocity of the penny upon impact when the penny reaches the ground in 5.57 seconds
ball b is hanging from an inextensible cord. an identical ball a is released from rest when it is just touching the
An electron and a proton are each placed at rest in a uniform electric field of magnitude 568 N/C. Calculate the speed of each particle
A 1450 kilogram car is traveling with a speed of 12 m/s on a frictionless, horizontal surface until it encounters a spring. Find what initial speed should the car have to compress the spring by 25.0 centimeter
A ball of mass 0.240 grams and positive charge, q =39.3 microC, is suspended on a string of negligible mass in a uniform electric field. We observe that ball hangs at an angle of theta =15.0 o from the vertical. What is the magnitude of electric f..
A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, What was the bear's average speed
A cube made of wood has sides 15.20 cm in length with an uncertainty of 0.05 cm. What is the final volume of the cube and its uncertainty
A 5.0-kg mass attached to a spring is displaced 8.0 cm from equilibrium position. What is the frequency of the oscillation
An object in equilibrium has three forces exerted on it. A 33-N force act at 90° from the x-axis and a 44-N force acts at 60°. What are the magnitude and direction of the third force?
A 90° elbow is used to direct water (? = 1000 kg/m3) flow at a rate of 25 kg/s in a horizontal pipe upward. The di-ameter of the entire elbow is 10 cm. The elbow discharges water into the atmosphere, and thus the pressure at the exit is the local ..
A ball is thrown horizontally from an elevation of 140.0 m above ground with a speed of 20.0m/s. How long before it hits the ground and where will it be with respect to the starting point once it lands
An object is falling from some height. The mass of the object and the height are given. Find the maximum compression of the spring
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