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The plane of a single circular loop with radius 0.1 m is held so the area vector of the loop is facing the North direction. A bar magnet with the South Pole facing the look is dropped through the loop. If it takes 0.5 seconds for the magnetic filed to change form 1.2T to 1.8T, what is the induced EMF in the loop?
External work equal to 4x10-7 J is needed to move a -5 nC charge at constant speed to a point at which the potential is - 20 V. What is the potential at the initial point
A spacecraft moving away from Earth emits a 4990 Hz signal. A scientist on Earth measures the signal to be 4989 Hz. What is the speed of the spacecraft relative to Earth
Illustrate what is the smallest angle of incidence with respect to the top mirror, such that the laser beam hits the mirrors in each way?
On a dry day, just after washing your hair to remove natural oils and drying it in detail, run a plastic comb through it. Small bits of paper will be attracted to the comb. Describe why.
A playground Merry-Go-Round has a mass of 291 kg which can be viewed as being uniformly distributed over a disk of radius 2.4 m. What is the new rotation rate assuming the child remains at the rim
The large blade of a helicopter is rotating in a horizontal circle. The length of the blade is 6.64 m, Find the ratio of the centripetal acceleration at the end of the blade to that which exists at a point
A 25.0-g object moving to the right at 16.0 cm/s overtakes and collides elastically with a 9.0-g object moving in the same direction at 15.0 cm/s
A generator consists of 23 loops, each with an area of 0.010m^2 located inside a uniform magnetic field of 2.0T. What is the rms voltage
A service station charges a battery using a current of 6.6A for 4.0h, How much charge passes through the battery
A spherical pinball, initially at rest, rolls down a ramp inclined at 18 degrees relative to horizontal. Determine the translational speed after 3 seconds
A hole of radius r has been drilled in a flat, circular plate of radius R. Find the moment of inertia for rotation about an axis through the centre of the plate
A person with a near point of 90 cm needs to read from a computer screen that is 40 cm from her eye. What is the power of the lenses
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