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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 7.80-g bullet moving at 480 m/s penetrates a tree trunk to a depth of 4.5 cm. find the average frictional force that stops the bullet
An athlete competing in the hammer throw swings a 4.0 kg hammer on a chain in a horizontal circle with a 5.4 m diameter. What is the tension in the chain attached to the hammer at that speed
the edge of a cube was found to be 30 cm with a possible error in measurement of 0.1 cm. use differentials to estimate
Suppose a person walks 5.00m east and then 4.00m west in 4 sec. What is the average velocity of this person
an astronomical telescope is used to project a real image of the moon onto a screen 32 cm from an ocular of 6 cm focal
question two particle move in a uniform gravitational field with an acceleration g. at a moment the particle were
A 6.5 kg block is on an incline with a coefficient of static friction of 0.50. The angle that the ramp makes with the horizontal is increased gradually, until the block begins to slide down the ramp. If you know that the coefficient of kinetic fricti..
An electron is released in a region where there is a varying electric potential. Will the electron move toward the lower potential region or the higher potential region
The coefficient of kinetic friction
a mass of 4 kg is pulled along a 0 deg frictionless plane by a mass of 5 kg that is hanging perpendicular connected by a rope and pulley. what is the acceleration of the masses
A glass bottle of soda is sealed by a screw cap. The absolute pressure of the carbon dioxide inside the bottle is 1.60 x10 5 Pa. Assuming that the top and bottom surfaces of the cap each have an area of 4.30 x 10 -4 m 2 ,get the magnitude of the fo..
express the potential difference between the plates.
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