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A 20 kg box rests on a 35 deg ramp. The coefficients of static and kinetic friction are 0.75 and 0.45, respectively. What force up the ramp is required to:
A) Just start the box moving up the ramp
B) Slide the box up the ramp at a constant speed.
c) Accelerate the box up the ramp at 1.2m/s2
a block of mass 0.222 kg is placed on the end of a spring which has a stiffness of 150. nm. it is pulled down 2.60 cm
q1. the temperature of the glass surface of a 30 w light bulb is 75degc when the room temperature is 10degc. estimate
A converging lens can be used as a lighter (on a sunny day). If you want to use it to light a match, where should you put the match, What is the radius of the mirror
A 110 ball and a 250 ball are related by a 38--long, massless, rigid rod. The balls rotate about their center of mass at 150 what is the speed of the 110 ball.
Consider two adjacent fields. One is an irrigated cropped field, the other is a fallow field. Which of the fields will have the highest Bowen ratio
The speed of the fastest-pitched baseball was 45.0 m/s , and the ball's mass was 145g. How many joules of kinetic energy did this ball have
A 15.0 g block with a charge of +6.00 10-5 C is placed in an electric field = (3000 - 600 ) N/C. What is the electrostatic force on the block
A block of ice at 0°C whose mass initially is m = 48.4 kg slides along a horizontal surface, starting at a speed vo = 4.91 m/s, Compute the mass of ice melted as a result of the friction between the block and the surface
A 50-m length of wire is stretched horizontally between two vertical posts, Find the magnitude of the earth's magnetic field at the location of the wire, assuming the field makes an angle of 67.0° with respect to the wire
Consider NH3 vapor acting as a van der Waals gas with coefficients a = 4.169 atm-L2-mol-2 and b = 0.0371 L-mol-1. How much heat must be added to 50.0 g of the gas so that it experiences no change in internal energy as it undergoes isothermal reversib..
a 330 g air track cart on a horizontal air track is attatched to a string that goes over a pulley with a moment of
two point charges q and -3q are located a distance d apart with -3q to the right of q. find the location of all the
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