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Why must both switches be closed when taking the ammeter and voltmeter readings? What is the effect of introducing the ammeter into the circuit? Of introducing the voltmeter? What is the significance of a negative theoretical value for a branch current?
Wearing layers of clothing in cold weather is often recommended because dead-air spaces between the layers keep the body warm. The explanation for this is that the heat loss from the body is less.
A 2kg hanging block pulls a 3kg block along a very smooth table. Compute for the acceleration of the system and the tension of the cord
A bat hits a moving baseball. If the bat delivers a net eastward impulse of 0.8 N-s and the ball starts with an initial horizontal velocity of 5.0 m/s to the west, what is the mass of the ball
a tire is filled with air at 22oc to a gauge pressure of 240 kpa. after driving for some time if the temperature of air
Light strikes a sodium surface, causing photoelectric emission. The stopping potential for the ejected electrons is 3.2 V, What is the wavelength of the incident light
A solenoid 2.9 m long has a radius of 0.85 cm and 630 turns. It carries a current I of 2.5 A. What is the approximate magnetic field B on the axis of the solenoid
Two balls of mass 0.6 kg and 0.8 kg are connected by a low-mass spring. This device is thrown through the air with low speed, what is the total momentum of the device
A particle with a rest mass of M=135GeV/c^2 or 1.35x10^11 eV/c^2 decays into two particles (which emerge back-to-back). The speeds of the two particles are measured at v1=.9c and v2=.01c. What are the masses of the two particles?
You need to prepare a 0.187mm-diameter tungsten wire with a resistance of 3.43 ohm. How long must the wire be
A runner whose mass is 55 kg accelerates from a stop to a speed of 8 m/s in 3 seconds. How much work is done on the point-particle system by this force
An object is 10 cm in front of a convergent lens that forms a real image 15 cm from the lens. The object is 2 cm high. Calculate the focal length of the lens and the height of the image. Construct a ray diagram to scale that verifies your results
a ball hung from a vertical spring oscillates in simple harmonic motion with an angular frequency of 2.6 rad/s, What is the maximum acceleration of the ball
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