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A 0.10kg dart is fired horizontally at the center of a 0.80kg vertically hanging block, sticking to it. The system reaches a maximum height, h, of 0.20m above the collision point. Find: a) the velo
Using energy conservations, how would your calculated final velocity change if you threw a ball off a building straight downward at the same speed as you threw it upward? Explain/give an example.
If a dielectric is inserted between the plates of a parallel-plate capacitor that is connected to a 100-V battery, which decreases? The electric field between the plates decrease, voltage across cap
What is the vacuum wavelength ? vacuum in the visible range (380 nm to 750 nm) at which destructive interference causes the film to look dark in reflected light?
A potential difference of 120 V produces a current of 8.0 A in the heating element of a toaster. What is the resistance of this heating element while the toaster is carrying this current?
A 5.00-kg steel ball is dropped onto a copper plate from a height of 10.0 m. If the ball leaves a dent 3.20 mm deep, what is the average force exerted by the plate on the ball during the impact?
A block of mass 0.80 kg is suspended by a string which is wrapped so that it is at a radius of 0.054 m from the center of a pulley. The moment of inertia of the pulley is 0.0040 kg·m2.
A 500 watt heater is used to heat water in a plastic bucket. Assume that 90% of the heat produced by the heater goes into heating the water. How long does it take for 2 kg of water at 100 degrees C
In zinc at room temperature, the mobility of mobile electrons is about 1.6 multiplied by 10-3 (m/s)/(V/m), and there are about 6.6 multiplied by 1028 mobile electrons per m3. Calculate the conductivit
A 500 watt heater is used to heat water in a plastic bucket. Assume that 90% of the heat produced by the heater goes into heating the water. How long does it take to heat 2 kg of water from 25 degre
A 10 mF capacitor and a 20.0 mF capacitor are connected in parallel with a 6.0 V battery. What is the charge on the 20.0 mF capacitor?
A truck is traveling at 11.1 m/s down a hill when the brakes on all four wheels lock. The hill makes an angle of 10.0° with respect to the horizontal. The coefficient of kinetic friction between
Suppose she starts at the top of the wave with a speed of 1.7 m/s and moves down the wave until her speed increases to 8.5 m/s. The drop in her vertical height is 2.6 m. If her mass is 59 kg, how mu
For comparison, a .22 caliber bullet has a mass of 2.6 g and, starting from rest, exits the barrel of a gun with a speed of 409 m/s. Determine the work done to launch the motion of both the hammer a
A 2.50 kg mass is attached to a light cord that is wrapped around a pulley of radius 3.45 cm, which turns with negligible friction. The mass falls at a constant acceleration of 3.85 m/s2. Find the m
A heat lamp emits infrared radiation whose rms electric field is Erms = 3500 N/C. (a) What is the average intensity of the radiation?
Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answe
At a certain instant before the carts collide, the first cart's velocity is +3.9 m/s, and the second cart's velocity is -1.1 m/s. (a) What is the total momentum of the system of the two carts at thi
The slower planet's orbital period is 7.25 years. (a) What is the mass of the star? (b) What is the orbital period of the faster planet, in years?
A basketball player tries to make a half-court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51(degrees), 14.0 m from the basket, what speed must t
A satellite is in a circular orbit about the earth (M = 5.98 x 1024 kg). The period of the satellite is 7.40 x 104 s. What is the speed at which the satellite travels?
Two strings of length 0.78 m hang from the same point on the ceiling. At the end of each string there is a small ball of mass 0.024 kg, electrically charged. The charges repel each other so that the
What are the minimum dimensions for the rear-view mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head?
The tungsten filament of one of your round bulbs has a radius of about 0.015 mm. Calculate the electric field required to drive 0.15 ampheres of current through the glowing bulb and show that it is
The mass of a star is 1.49 x 1031 kg and it performs one rotation in 26.1 days. Find its new period (in /days) if the diameter suddenly shrinks to 0.59 times its present size. Assume a uniform mass