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Q. A small metal ball, carrying a net charge of q_1 = -2.70 mu C, is held in a stationary position by insulating supports. A second small metal ball, with a net charge of q_2 = -7.20 mu C and mass 1.70 g, is projected toward q_{1}. When the two spheres are 0.800 rm m apart, q_{2} is moving toward q_{1} with speed 22.0 rm m/s . Assume that the two spheres can be treated as point charges. You can ignore the force of gravity.What is the speed of q_{2} when the balls are 0.450 m apart?
Q. A 0.75 meter long metal bar is released from rest. It is connected to the circut as shown which is positioned in a magnetic field of 4.3 T. After a very short distance the bar falls at a constant speed.
A. If the bar has a mass of 4 kg what current must be induced on the circuit?
B. Given that the resistor is 6 ohlms, what is the speed that the bar falls?
What direction is white dot on the sensor pointing
A 30-06 caliber hunting rifle fires a bullet of mass 0.0122 kg with a velocity of 247 m/s to the right. The rifle has a mass of 3.2 kg. What is the recoil speed of the rifle as bullet leaves the rifle.
A small grinding wheel has a moment of inertia of 4.0×10-5 kg m^2. What net torque must be applied to the wheel for its angular acceleration to be 160 rad s^2.
while the other terminal of the ammeter is connected to the other wire, ammeter shows that the current through the wire is 1 A. You then disconnect everything and travel to the other end of the telephone line, where you repeat the process and find ..
What friction torque is necessary to reduce its angular speed from 90.0 {rm rpm} to 45.0 {rm rpm} in a time interval of 32.0 {rm s}.
A wheel 45.0 cm in diameter accelerates uniformly from 206rpm to 340 rpm in 7.0 s. How far will a point on edge of the wheel have travelled in this time.
A hydrogen molecule with an initial velocity of 1200m / s makes a collision with a molecule of oxygen at rest. The reason for the masses of molecules is mO / mH = 16. What are the speeds of the molecules after collision.
A 3.5 m long, 310 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 70 kg construction worker stands at the far end of the beam.
A 246 kg wooden raft floats on a lake. as a 85 kg man stands on the raft, it sinks 5.0 cm deeper into the water. When he steps off, the raft vibrates for a while.
A 2.46×10^4 rocket blasts off vertically from the earth's surface with a constant acceleration. Throughout the motion considered in the problem, suppose that remains constant. Inside the rocket, a 15.10 instrument hangs from a wire that can support a..
A 65.0 kg human sprinter can accelerate from rest to 10 m/s in 2.90 s. all through the same interval, a 33 kg greyhound can accelerate from rest to 20 m/s. calculate (a) change in kinetic energy and (b) average power output for each.
How large does the radius R of the dish have to be to achieve an electric field vector amplitude of 0.1 rm mV/m at the receiver.
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