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Two horizontal forces, f1 and ,f2 are acting on a box, but only is shown in the drawing. F2 can point either to the right or to the left. The box moves only along the x axis. There is no friction between the box and the surface. Suppose that F2 = +6.8 N and the mass of the box is 3.9 kg. Find the magnitude and direction of F2 when the acceleration of the box is (a) +4.2 m/s2, (b) -4.2 m/s2, and (c) 0 m /s2
An object is located 19.0 cm in front of a convex mirror, the image being 7.73 cm behind the mirror. How far in front of the mirror is the second object located
a mass m neutron has elastic collision with a mass m' stillnucleus. How much kinetic energy does the neutron lose
A 12.7-kg block initially slides at 13.1 m/s on a flat rough surface and eventually stops. what is the entropy change of the system
The heat of fusion for water is 80. cal/g. How various calories of heat are released when 20.0 g of water at 30. °C is cooled to 0 °C and frozen to ice at 0 °C
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.695 s to reach the opposite tower, 20.0 m away. If a 1.00-m length of the ..
question1a variable reluctance sensor consists of a core a variable air gap and an armature. the core is a steel rod of
A standard deck of cards contains 52 different cards. A poker hand consists of five cards, chose randomly. How many different poker hands are there
Over a time interval of 2.17 years, the velocity of a planet orbiting a distant star reverses direction, changing from +17.9 km/s to -18.0 km/s. find the total change in the planet's velocity
A box slides down a 40° ramp with an acceleration of 1.260 m/s2. Find out the coefficient of kinetic friction between box and ramp.
Two traveling waves, 1 and 2, are described by the equations below. Which one has the largest maximum displacement
Consider a too-small space station that consists of a 2.7m radius rotating sphere. A man standing inside is 1.9m tall and his feet are at 1g. What is the acceleration of his head.
Consider a small, conducting sphere of 0.0010 kg mass. Extra electrons are placed on this sphere, How many electrons must be added to each sphere
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