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A box rests on top of a flat bed truck. The box has a mass of m = 18.0 kg. The coefficient of static friction between the box and truck is ?s = 0.82 and the coefficient of kinetic friction between the box and truck is ?k = 0.67. The truck accelerates from rest to vf = 15.0 m/s in t = 14.0 s (which is slow enough that the box will not slide).
In the previous situation, what is the frictional force the truck exerts on the box (in N)?
Sharon has a mass of 60 kg and is standing on a giant skateboard that is initially at rest and has a mass of 30kg. what is the speed of the skateboard
The roof of the student dining hall at your college would be supported by high cross-braced wooden beams attached in the shape of an upside-down L. Each vertical beam is 10.0 ft high and 2.0 ft wide.
A bicyclist of mass 75 kg ( including the bicycle) can coast down a 4.0 degree hill at a constant speed of 10 km/h. Pumping hard,the cyclist can descend the hill at a speed of 30 km/h.
The electric field has been measured to be horizontal and to the right everywhere on the closed box. All over the left side of the box E1 = 120 V/m, and all over the right, slanting, side of the box E2 = 250 V/m. On the top the average field is E3..
The shell, with radius R and negligible thickness, has net charge - 4.00 q. Find an expression for the electric field strength outside the sphere
Tasha with a nearsighted eye has near and far points of 16 cm and 25 cm, respectively. What is the power of the lens she uses
A small puck of mass m=0.1kg moves in a circle of radius 0.3m on a table top; the puck is tied with a massless string to a tether at the origin. find the tension in the string at the end of one revolution
A very long solenoid with a circular cross section and radius r= 7.10 cm with n= 1.50E+4 turns/m has a magnetic energy density uB= 5.10 mJ/m3. What is the total energy stored in the solenoid
A 8.6cm diameter wire coil is initially oriented so that its plane is perpendicular to a magnetic field of 0.64T pointing up. What is the average induced emf in the coil
A converging lens (f1 = 24.0 cm) is located 56.0 cm to the left of a diverging lens (f2 = -28.0 cm). How far is the object from the converging lens
determine that the auto was traveling at a speed of approximately 30 m/s upon impact with the groung. Explain how fast must the car have been moving before leaving the road?
The earth orbits the sun in an approximately circular orbit of radius 1.496 1011 m (about 93 million miles) in a period of 365 1/4 days. Use these data to determine the mass of the sun
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