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A 3.5 kg object is accelerated from rest to a speed of 44.9 m/s in 73 s. What average force was exerted on the object through this period of acceleration?
An airplane travels 277 m down the runway before taking off. Assuming that it has constant acceleration, if it starts from rest and becomes airborne in 9.00 s how fast is it moving at takeoff?
An iron bar 50 cm long is raised to a copper bar 60 cm long and of the same diameter. What is the heat flow down the rod if its cross-sectional area is 2.50 cm2
Two capacitors are identical, except that one is empty and the other is filled with a dielectric (k = 5.0). What must be the potential difference across the plates of the capacitor filled with a dielectric
A120g copper bowl contains185g of water, both at 20.0°C. A very hot 300 g copper cylinder is dropped into the water, causing the water to boil, How much energy (in calories) is transferred to the bowl
A proton traveling 3.0 E 6 m/s enters half way in a capacitor and travels 2.00 E -3 meters before crashing into the bottom plate, What is the voltage applied to the capacitor from the battery
The planes of atoms in a cubic crystal lie parallel to the surface, 0.87 nm apart. X rays having wavelength 0.41 nm are directed at an angle θ to the surface. For how many values of θ will there be a strong reflection? What is the largest value of θ ..
ccccthe Zambesi river in Africa rushes over Victoria Falls at a rate of 25 x 10^6 gallons per minute. The falls are 108 m high, 1 gallon equals 3.785 x 10^-3 m^3 (or 0.1337 cubic foot), and the water has a density of 1.00 x 10^3 kg/m3 (each cubic foo..
A car starts from rest and travels for 10s with a uniform acceleration of +2.4 m/s2. The driver then applies the brakes, causing a uniform negative acceleration of -2.0 m/s2.
An outside loudspeaker (considered a small source) emits sound waves with a power output of 100 W. (a) Find the intensity 10.5 m from the source. W/m2 (b) Find the intensity level in decibels at that distance. dB (c) At what distance would you experi..
The two capacitors are then connected in parallel, with the positive plate of C1 connected to the negative plate of C2 and vice versa. Afterward, what are the charge on and the potential difference across each capacitor
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
how many 103 w lightbulbs can you use in a 103 v circuit without tripping a 14 a circuit breaker? the bulbs are
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