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A 2,199-kg car is moving up a road with a slope (grade) of 29% while slowing down at a rate of 2.1 m/s^2. What is the direction and magnitude of the frictional force? A 1,967-kg car is moving up a road with a slope (grade) of 11% while slowing down at a rate of 3.3 m/s^2. What is the direction and magnitude of the frictional force? (define positive in the forward direction, i.e., up the slope)? A 2,160-kg car is moving up a road with a slope (grade) of 40% while speeding up at a rate of 2.8 m/s^2. What is the direction and magnitude of the frictional force? (define positive in the forward direction, i.e., up the slope)?
An 52.0 N box of clothes is pulled 6.7 m up a 30.0° ramp by a force of 107 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, compute the change in the box's kinetic energy.
What is the net amount of heat this person could radiate per second into a room at 19.0 oC (about 66.2oF) if his skin's surface temperature is 31.0oC? (At such temperatures, nearly all the heat is infrared radiation, for which the body's emissivity..
In cesium atoms (Z = 55), the 55th electron has principle quantum number n=6 and is outside closed shells, which partially shield the nuclear charge. First, suppose the shielding effect of the 54 inner electrons is perfect, and use the Bohr Theory t..
A supersonic jet flying at 145 m/s is accelerated uniformly atthe rate of 23.1 m/s2 for 20.0 s. How many times thespeed of sound is the planes final speed
A commonly used method of fastening one part to another part is called "shrink fitting." A steel rod has a diameter of 2.0053 cm, By how many Celsius degrees should the rod be cooled
a tiny sphere of mass 7.30 microg and charge 2.80 nc is initially at a distance of 1.74 microm from a fixed charge of
A compressed-air cylinder stands 96.0 cm tall and has internal diameter 21.0cm cm . At room temperature, its pressure is 161 atm. How many moles of air are in the cylinder
Neurons in our bodies carry weak currents that produce detectable magnetic fields. A technique called magnetoencephalography, or MEG, is used to study electrical activity in the brain using this concept.
A mass of 1.0 kg is dropped from a height of 8.0 m above the top of a spring of constant k=200 N/m mounted vertically on the floor. Find the springs maximum compression
Batman (mass = 101 kg) jumps straight down from a bridge into a boat (mass = 590 kg) in which a criminal is fleeing. What is the velocity of the boat after Batman lands in it
two speakers are playing two different but pure frequencies fa 110 hz an a two below middle c and fb 124 hz the b one
A 6.0 V battery is connected to a wire made of three segments of different metals connected one after another, Find the potential difference across tungsten wire
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