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Two children are sliding down a snowy hill which is inclined by 43.5 degrees with respect to horizontal. One has a rough sled which has a coefficient of kinetic friction between it and the snow of μ?k = 0.374; the other has a slippery sled which has a coefficient of kinetic friction between it and the snow of μ?k= 0.142. If both children start at the top of the 41.2 m tall hill initially at rest, what is the difference in speed between these two sleds at the bottom of the hill?
Scott is rolling down a 30° slope on his skateboard. The total mass of Scott and the skateboard is 75 kg. What is Scott's acceleration
The length of a certain wire is doubled and at the same time it's radius is reduced by a factor of 2
In the figure below, block 1 of mass m1 slides along an x axis on a frictionless floor with a speed of v1i = 2.40 m/s. Then it undergoes a one-dimensional elastic collision with stationary block 2 of mass m2 = 0.200m1.
A man pushes a wooden crate on wooden floor. The direction of the force is 30o from the horizontal. How much force does he use in order to maintain a constant speed
The rails are laid on a winter day when their temperature is 1.8°C. (a) How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 32.2°C
Two very small spheres are initially neutral and separated by a distance of 0.55 m. find Is the force attractive or repulsive
When a high speed passenger train traveling at 113 km/h rounds a bend, the engineer is shocked to see that a locomotive has improperly entered onto the track from a siding and is a distance D = 642m ahead.
The Mariana trench is located in the Pacific Ocean at a depth of about 11,000 meter below the surface of the water. estimate the weight of a jetliner whose mass is 4.21 x 105 kilogram
A large wooden crate is pushed along a smooth, frictionless surface by a force of 100N. The acceleration of the crate is measured to be 2.5 m/s2. What is the mass of the crate?
A 2.00 kg block is held in equilibrium on an incline of angleθ =60° by ahorizontal force vector F applied in the direction shown in the figure below. If the coefficient of static friction between block and incline isµs = 0.300, determine the followin..
The armature of an ac generator has 100 turns. Each turn is a rectangular loop measuring 8.0 cm by 12 cm. The generator has a sinusoidal voltage output with an amplitude of 24 V. If the magnetic field of the generator is 250 mT, With what frequenc..
The world consumes energy at the rate of about 456 per year, where the joule is the SI energy unit. estimate the average per capita energy consumption rate in watts
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