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A 20.0-kg box rests on a horizontal surface. The coefficient of static and kinetic friction between the box and the surface are 0.30 and 0.10 respectively. If a force of 80.00 N , what is the friction force between the box and the surface?
A muon travels 60 km through the atmosphere at a speed of 0.9995c. According to the muon, how thick is the atmosphere
A block with a mass of 2.45kg is pushed up an incline plane that makes an angle of 34.2o with respect to the horizon. How much work did the frictional force do on the block
A uniform cylinder (radius = 10.0 cm) is mounted so as to rotate freely about a horizontal axis that is parallel to and 5.0 cm from the axis of the cylinder, what's the angular speed of the cylinder
The length of a beam increases by 1.26mm when its temperature is raised from 29.87oC to 71.49 oC. What is the length of the beam at the initial temperature
An electron has an initial velocity of 5.00 106 m/s in a uniform 9.00 105 N/C strength electric field. How long does it take the electron to come to rest
A d = 3.77 mm diameter wire carries an electric current of I = 11.9 A when the electric field is E = 6.60×10-2 V/m along the wire. What is the conductivity of the wire
Suppose you aim to suspend in air a perfectly reflecting 4cmx4cm surface, with mass m = 0.00045kg. What intensity of light must you shine on it
On a trip to Northern ontario, a car drives east for 2 hours at 100 km/h and then north for 8 hours at 100 km/h. What is the average velocity of the car for this trip
An electron and a positron have masses of 9.11 10-31 kg. They collide and both vanish, What is the energy of the electromagnetic radiation
An electron starts from rest 54.9cm from a fixed point charge with Q = -0.278uC. How fast will the electron be moving when it is very far away
Two charged particles, q1 = ?2.50×10?3 C and q2 = +3.850e-3 C, are separated by a distance of 5.00 cm. What is the electric potential energy of this configuration
A rope is used to pull a 4.56 kg block at constant speed 5.47 m along a horizontal floor. find the work done by the rope's force
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