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A 45 g golf ball is pushed up a 30° ramp. The ball starts from rest and the length of the surface of the ramp is 5 m. The coefficient of kinetic friction between the surface on the ramp and the ball is 0.1. The force ceases when the ball leaves the top of the ramp and the total horizontal distance travelled by the ball after leaving the ramp is 20 m. What was the magnitude of the pushing force (in N)?
suppose a photon of wavelength 0.1A is absorbed by an n=1 electron in potassium(Z=19) and the electron is removed from the atom. find the velocity of the electron
q1. chromium is produced by reacting its oxide with aluminium. if 354 g of cr2o3 and 158 g of al react to form 204 g of
At time a grinding wheel has an angular velocity of 22. It has a constant angular acceleration of 28.0 until a circuit breaker trips at time = 1.60 . From then on, the wheel turns by an angle of 438 as it coasts to a stop at constant angular decel..
Two long, straight wires cross each other at right angles, and each carries same current. Which of the following statements are true regarding the total magnetic field at the various points due to the two wires.
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. What is the acceleration of the yellow car
A wooden block weighing 7 N is at rest on top of a wooden desk. The coefficient of static friction between the block and the desk is 0.41. Find out the minimum horizontal force required to move the block if the following occurs.
A football player runs the pattern given in the drawing by the three displacement vectors A, B, and C. find the angle q that the resultant vector makes with the east direction
A 280-kg piano slides 4.3 m down a 30o incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40.
A current of 15.0 mA is maintained in a single circular loop with a circumference of 3.30 m. find the magnitude of the torque exerted by the magnetic field on the loop
After a plant or animal dies, its 14C content decreases with a half-life of 5730 years. If an archaeologist finds an ancient firepit containing partially consumed firewood, what is the age of the ancient site
A sinusoidal wave travels along a stretched string. A particle on the string has a maximum velocity of 0.900m/s, What is the frequency and amplitude of the wave
In 1911, Ernest Rutherford and his assistants Geiger and Marsden conducted an experiment in which they scattered alpha particles, What is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction
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