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Calculate the force a mother must exert to hold her 12.0 kg child in an elevator accelerates upward at 0.850 m/s2
When landing after a spectacular somersault, a 40.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force she must exert
Two spheres are launched horizontally from a1.0m -high table. Sphere A is launched with an initial speed of 5.0m/s. What is the time for the sphere A to hit the floor
Block A weighs 40-lb. Block B weighs 80-lb. The coefficient of friction between both blocks and the surface is µ=0.3. Determine how far B travels before it stops
On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. What is the total kinetic energy of the two blocks after the collision (in joules)
A positively charged particle of mass 6.80 10-8 kg is traveling due east with a speed of 25 m/s and enters a 0.32-T uniform magnetic field. What is the magnitude of the magnetic force acting on the
A 266 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. Find the tension in the rope
A kaon is moving in the +x direction decays by this process, where that pi^+ is moving off at a speed of 0.9c in the +x-direction, determine the speed of the kaon before the decay
A particle moving at a speed of 0.92c is observed to have a mass of m=1682 MeV/c^2. Determine the rest mass Mo of the particle in kg
A radioactive atom is moving with respect to the laboratory (which is the Earth frame) at the speed of 0.8c in the +x direction. determine the velocity of the electron measured by a laboratory observe
A solenoid is wound with a single layer of insulated copper wire of diameter 2.000 mm and has a diameter of 5.000 cm and is 1.800 m long. How many turns are on the solenoid
A parallel-plate capacitor has plates of area 114.0 cm2 and a separation of 1.45 cm. A battery charges the plates to a potential difference of 177.0 V, What is the capacitance with the slab in place
An initially stationary 1.3 kg object accelerates horizontally and uniformly to a speed of 17 m/s in 3.0 s. What is the instantaneous power due to that force
A parallel-plate capacitor has plates with an area of 395 cm2 and an air-filled gap between the plates that is 2.29 mm thick. How much energy is stored in the capacitor
If this amount were shaped into a cube, what would be the length of one edge of that cube (in meters)
Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. What is her useful power output
A 200-m-wide river flows due east at a uniform speed of 4.5m/s. A boat with a speed of 9.0m/s relative to the water leaves the south bank pointed in a direction 28o west of north. How long does it t
One hockey puck of mass 0.2 kg strikes an identical stationary puck on a frictionless ice rink. what fraction of the energy was lost
A bowling ball (mass = 7.2 kg, radius = 0.11 m) and a billiard ball (mass = 0.39 kg, radius = 0.028 m) may each be treated as uniform spheres
If the top coil were rotated 90 degrees about a vertical axis through the center of the coil so it is perpendicular to the balance coil, how would the results of the experiment change
A coin placed on a turntable rotating at 37.9 rev/min will stay there if its center is placed no further than 8.5 cm from the axis of rotation. find the coefficient of friction between the coin a
A rock is thrown upward from the level ground in such a way that the maximum height of its flight is equal to its horizontal range R. At what angle is the rock thrown
Our apparent weight is actually judged not by the force of gravity pulling on us, By what percent will your apparent weight change if you were to travel from the north pole to the equator
A molecule of DNA (deoxyribonucleic acid) is 2.35 µm long. The ends of the molecule become singly ionized: Determine the effective spring constant of the molecule
A certain freely falling object, released from rest, requires 1.05 s to travel the last 33.0 m before it hits the ground. Find the total distance the object travels during the fall