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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.
At the moment of release, two planes have the same speed of 152 m/s, and each is carrying a tank at the same height of 2.05 km above the ground. find direction of the velocity with which the fuel tank hits the ground if it is from plane A
two stationary positive point charges charge 1 of magnitude 3.00 and charge 2 of magnitude 2.00 are separated by a
Five grams of nitorgen gas at an initial pressure of3.0atm and at a 20 degrees celcius undergo an iobaric expansionuntil the volume has tribled. What is the gas volume after the expansion?
A 20 wood ball hangs from a 1-long wire. The highest tension the wire can withstand without breaking is 600. A 0.90 projectile travelling horizontally hits and embeds itself in the wood ball. What is the largest speed this projectile can have with..
the four particles form a square of edge length a = 4.50 cm and have charges q1 = +25.0 nC, q2 = -50.0 nC, What net electric field do the particles produce at the square's center
a 0.800-kg particle has a speed of 1.30 ms at point a and kinetic energy of 8.00 j at point b.a what is its kinetic
An object to the left of a lens is imaged by the lens on a screen29.0 cm to the right of the lens. When thelens is moved 4.00 cm to the right, thescreen must be moved 4.00 cm to the leftto refocus the image. Determine the focal length of the lens.
A m1 = 14.50 kg object and a m2 = 10.00 kg object are suspended, joined by a cord that passes over a pulley with a radius of 10.00 cm and a mass of 3kg.
Two electric charges q1 = +10 ?C and q2 = -20 ?C are located 0.35 m apart. How much work is required to double the distance between the charges
The 5.63- kg weight that drives the time mechanism of a grandfather clock descends 25 cm in exactly 24 hours. What power is delivered to the mechanism
A wheel rotates with a constant angular acceleration of 3.10 rad/s2. Assume the angular speed of the wheel is 1.55 rad/s at ti = 0. a) Find the angle through which the wheel rotates between t = 2.00 s and t = 3.10 s. _____rad (b) Find the angular spe..
The owner of a van installs a rear-window lens that has a focallength of -0.330 m. When the owner looks out through the lens at anobject located directly behind the van, the object appears to be0.200 m from the back of the van, and appears to be 0..
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