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Archer fish often prey for flies that hover above the water. The index of refraction of water is 1.33. what would be a "safe" horizontal seperation for the fly
Find the acceleration of a forklift of mass 1400 kg pushed by a force of 2100 N that is opposed by a frictional force of 425 N.
Calculate the energy needed to accelerate a spaceship with a mass m = 25 × 103 kg toa speed of 0.40c. Compare this number with the approximate annual energy usage ofEarth, 1021 J
1)A crate of potatoes of mass 19.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.82 and μk = 0.29. Find the frictional force (magn
An open container holds ice of mass 0.595kg at a temperature of -13.5 celcius . The mass of the container can be ignored. How much time passes before the ice starts to melt
A crate of potatoes of mass 8.0 kg is on a ramp with angle of incline 30° to the horizontal. The coefficients of friction are μs = 0.72 and μk = 0.43. Find the frictional force (magnitu
A very thin sheet of glass (n=1.5) floats on the surface of water (n=1.33). When illuminated with white light at normal incidence, What is the thickness of the glass
An iron bar of mass, 0.55 kg, slides down a frictionless incline 0.41 m high. What is the speed of the combined masses after collision
A skateboarder shoots off a ramp with a velocity of 6.9 m/s, directed at an angle of 56 ° above the horizontal. The end of the ramp is 1.1 m above the ground. how far is this point horizontally
A cryogenic storage container holds liquid helium, which boils at 4.2 K. Suppose a student painted the outer shell of the container black, Determine the rate of heat loss due to radiation
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
A 1000kg car accelerates from rest to 60mph (134m/s) in 10s. During this time, its engine was operating at 3600rpm. Use the work-energy theorem to find the net work done by the car
A 14-Ω coffee maker and a 14-Ω frying pan are connected in series across a 120-V source of voltage. Find the total current supplied by the source of voltage
An archaeologist found a fragment bone of animal. It has an activity per gram of carbon that is 25% that of an equivalent sample of carbon from a similar living animal
A particle executes linear harmonic motion in one dimension with a frequency of 0.25 Hz about the point x=0. Determine an equation of motion for this oscillator
The momentum of a soccer player is 100kg-m/sec and he hits a soccer ball with a mass 0.1 kg, find the speed(velocity) of the soccer ball
Consider the nuclear reaction: (2/1)H + (9/4)Be --> (7/3)Li + (4/2) He. How much energy is liberated
A wheel (radius 0.6 m) is rolling on a horizontal surface with a center of mass acceleration of 0.7 m/s2. compute the friction force acting between the wheel and the surface
Suppose two highly precise, identical clocks are synchornized and one clock is placed at the North Pole and one clock is placed at the equator. After 100 years, how much time will the clocks differ
A sheet of plywood 1.39 cm thick is used to make a cabinet door 55.5 cm wide by 69.5 cm tall, what is the moment of inertia of the door about the hinges
One mole of neon, a monatomic gas, starts out at conditions of standard temperature and pressure. find the heat added to the gas
The new earth-Pluto SuperShuttle line boasts that it can take you between the two planets (which are about 5.0 h apart in time) in 2.5 h, what is the shuttle's cruising speed
A 5 kg block sits on top of a 10 kg block which rests on a horizontal frictionless surface. What is the minimum coefficient of static friction necessary to keep the top block from slipping on the bott
You have two weeks vacation and want to travel to a gambling space colony located 3.22 x 10^14 meters from Earth. how fast must you travel to accomplish this
If a boat can move in still water at 28 mph, but it is moving west to cross a stream that flows 7.2 mph south. What velocity does the boat ultimately achieve