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Part (a) What is the magnitude of the average force the rock experiences, F in Newtons, during the time t?
A student m = 97 kg runs at a velocity vi = 2.85 m/s before jumping on a skateboard. After jumping on the board the student has a velocity vf = 2.35 m/s. Part (a) Write an expression for the weight
A BB gun is fired at a cardboard box m2 = 1.85 kg on a frictionless surface. The BB has a mass of m1 = 0.044 kg and travels at a velocity of v1 = 93 m/s. It is observed that the box is moving at a v
A coal car m1 = 3411 kg is rolling down the tracks at a velocity of vi = 2.6 m/s when a loader drops a load of coal m2 = 5411 kg into the car. Part (a) What is the momentum of the system in kg m/s b
A uniform solid sphere is rolling without slipping along a horizontal surface with a speed of 5.50 m/s when it starts up a ramp that makes an angle of 25.0 degrees with the horizontal. What is the s
What is the angular velocity of the tire? What is the angular acceleration of the tire? What is the magnitude of the total acceleration?
A small wooden block with mass 0.900 is suspended from the lower end of a light cord that is 1.76 long. The block is initially at rest. A bullet with mass 0.0102 is fired at the block with a horizon
If the man falls with his knees and ankles locked, the only cushion for his fall is a 0.500 cm give in the pads of his feet. Calculate the average force exerted on him by the ground in this situatio
A basketball player makes a jump shot. The 0.615 kg ball is released at a height of 1.82 m above the floor with a speed of 7.37 m/s. The ball goes through the net 3.10 m above the floor at a speed o
The natural period of an undamped system is 3 sec, but with an damping force proportional to the velocity, the period becomes 5 sec. Find the differential equation of motion of the system and its so
1) Consider a long, straight wire with current I running through it. You measure the magnetic field to be B at a distance d from the wire. a. What will the magnetic field at d be if you triple the c
In the above problem, what would be the induced emf if the sides of the loop were cut in half--in other words it was a square loop of 20 cm on a side?
The heating element of a coffeemaker operates at 120 V and carries a current of 2.00 A. Assuming that the water absorbs all of the energy converted by the resistor, calculate how long it takes to he
Once the box in the previous problem is moving, what force must be applied to keep it moving at a constant speed if the coefficient of kinetic friction between the box and the floor is 0.30?
If the bird's feet are 4.1 cm apart, calculate the potential difference across its body. (The resistivity of the wire is 1.7 10-8 m) . Your response differs significantly from the correct answer.
A cooling fan is turned off when it is running at 900rev/min . It turns 800 revolutions before it comes to a stop. What was the fan's angular acceleration, assumed constant? How long did it take the
The electric field between the plates of a paper-separated (K = 3.75) capacitor is 8.24×10^4 V/m. The plates are 1.80 mm apart, and the charge on each plate is 0.795uC. Determine the capacita
A charge is accelerated from rest through a potential difference and then enters a uniform magnetic field oriented perpendicular to its path. The field deflects the particle into a circular arc of r
The work done by an external force to move a -8.20uC charge from point a to point b is 1.80×10^-3J . If the charge was started from rest and had 4.85×10^-4 J of kinetic energy when it r
An electron with speed vo= 2.61×107m/s is traveling parallel to an electric field of magnitude E= 1.03 × 104 N/C . How far will the electron travel before it stops? How much time will elap
A battery produces 41.9V when 7.20A is drawn from it and 48.7V when 1.90A is drawn. What is the internal resistance of the battery? What is the emf of the battery?
The emission at wavelength 501.5 nm creates a first-order bright fringe 21.90 cm from the central maximum. What is the wavelength of the bright fringe that is 31.60cm from the central maximum?
The electric field of a spherical Van de Graaff generator with a radius of 10 cm has a magnitude of 2.5E5 N/C near its surface. The field points radially outward. What is the magnitude of the electr
How many excess electrons must the water droplet have in order for the electric field to suspend it against gravity? ("Excess" electrons are those beyond the number needed for the droplet to be char
Consider an electron with an initial speed v0 = 29 Mm/s (1 Mm = 1 megameter = 1000 km = 1E6 m) that is traveling parallel to an electric field (v0||E) of magnitude E = 7.1 kN/C (1 kN = 1 kilonewton