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A child wants to pump a bicycle tire so that its pressure is2.5x10^5 Pa above that of atmospheric pressure. If the child uses apump with a circular piston 0.035 m in diameter, what force must the child exert?
A constant horizontal force moves a 50 kg trunk 3.0 m up a 29° incline at constant speed. What is the work done by the applied force
You have a tuning fork with a frequency of 256Hz. You measure the length of a closed tube to be 32 cm for the 1st harmonic. what is the speed of sound in this tube?
suppose the radius of the ball is very small compared to other length scales in the problem. Take starting level as step 0, the next step down as step 1, and so on.
A solid, horizontal cylinder of mass 9.0 kg and radius 1.30 mrotates with an angular speed of 6.00 rad/s about a fixed verticalaxis through its center. Determine the final angular speed of the system
An inductor of L=0.7H and a charged capacitor C=5F with Q =20C are connected to each other. How much energy is stored in the capacitor initially? When the current in the circuit is ½ its maximum value, how much energy remains in the capacitor?
A small ball is located at the origin and has as charge of +3.9 nC. At a distance of 5.8 cm the electric field has a magnitude of 10422 N/C. What is the direction of the electric field, away or toward the ball
Ship A is located 3.2 km north and 2.1 km east of ship B. Ship A has a velocity of 22 km/h toward the south and ship B has a velocity of 40 km/h in a direction 37° north of east. At what time is the separation between the ships least
A 4.5 volt battery is connected to a buld with a resistance of 1.6 ohm. How many electrons leave the battery per second
a basketball leaves a players hands at a height of 2.25 m above the floor. the basket is 3.05 m above the floor. the
What is the rate of change entropy of the first reservoir.
Two rods of equal length L = 1.51 m form asymmetric cross. The horizontal rod has a chargeof Q = 100.0 C, and the vertical rod a charge of-Q = -100.0 C. The charges on both rods are distributed uniformly along their length.
A 50-g block of an unknown material is at 530°C. It is dropped into a thermally insulated cup containing 0.07L of water at 20°C. If the temperature of the compound rises to 50°C, what is the specific heat of the unknown material?
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