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1. A proton with a speed of 4.5 x 10^6 m/s is observed to travel in a circle of radius 0.22m in a magnetic field. What is the strength of the magnetic field?
A. 2.3 x 10^-2 TB. 2.1 x 10^-1 TC. 4.7 TD. 1.1 x 10^5 T
2. A 56V DC motor draws a 2.0A when running at full speed. If the resistance of the armature is 1.5 ohms, what is the back emf (reverse voltage) at this speed?
A. zeroB. 3.0 VC. 53 VD. 59 V
3. An ideal transformer is being designed to change a 640 V AC into 120 V AC. What should be the ratio of the number of turns on the primary coil to the number of turna on the secondary coil?
A. 0.035B. 0.19C. 5.3D. 28
If the focal length of lens is 0.67 m and the distance of the object is 120 cm. Find the distance of image and magnification
A race cars start from rest on a circular track of radius 210 meter. The car's speed increases at the constant rate of 0.590 m/s2. Determine the speed of the race car
At its highest temperature, a space heater has a resistance of 31.5 ? when it is plugged into a wall outlet supplying a peak voltage of 169.7 V sinusoidally at 60 Hz
The gauge pressure in a helium gas cylinder is initially 26atm. What fraction of the original gas remains in the cylinder
A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling horizontally to the right at a speed of 60.0m/s, Find the vertical component of the average force on the ball
A uniform magnetic field increases from 1.0 T to 1.2 T inb 0.5 s. What is the rate of change of the magnetic field
The small mass m sliding without friction along a looped track is to remain on the track at all times, Calculate the magnitude of the normal force exerted by the track at the top of the loop
Starting from rest, a basketball rolls from the top of a hill to the bottom, reaching a translational speed of 6.6 m/s. Ignore fritional losses. What is the height of the hill
Estimate mean and maximum velocities for a liquid
Find the work required to move a planet satellite of mass 1890 kilogram from a circular orbit of radius 2R to one of radius 3R, where 3.95 x 106 meter is the radius of the planet
A person pushes the shopping cart with a force of 100 N acting down at 45 degrees. Of the cart travelled at a constant speed of 1.00 meters per second what is the value of combined retarding force acting horizontally on the cart due to friction an..
A motor pulls a ski tow rope moving 10 skiers at a time (each 75kg) up a slope of 20 degrees at a constant 2m/sec speed. find the minimum power the motor must have to accomplish this
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