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Q1. A 9.0 cm diameter wire coil is at first oriented so that its plane is perpendicular to a magnetic field of 0.67 T pointing up. During the course of 0.30 s, the field is changed to one of 0.25 T pointing down. What is the average induced emf in coil?
Q2. How do you find the current whilst you have the loop with two power supplies and three resistors in parallel?
Q3. An attack helicopter is equipped with a 23- mm cannon that fires 58 g shells in the forward direction with a muzzle speed of 1130 m/s. The fully loaded helicopter has a mass of 3490 kg. A burst of 245 shells is fired in a 5.87 s interval.
What is the resulting average force on that helicopter?
An object with a mass of 84.0 g displaces 240.0 ml of water when it is completely immersed. What is the buoyant force on the mass
A child on a freely rotating merry-go-round moves from near the center to the edge. Will the rotational velocity of the merry-go-round increase, decrease, or not change at all? Explain.
A small bridge is constructed of a single concrete slab which has a length of 14.5 m at 21.7 °C. Calculate the change in the length of the bridge if the temperature changes to 28.7 °C
The radius of our Sun is 6.96*10^8 m, and its total power output is 3.85*10^26 W. find lambda-max for the Sun
A rectangular metal block is 0.6 m long, 0.2 m wide, and 0.1 m tall. The block weighs 270 N. What is the density of the fluid
a 15 g rubber bullet hits a wall with a speed of 150 m/s. What force did the wall apply to the bullet
A certain heat engine does 10.2 kJ of work and 9.5 kJ of heat is transfered to the environment in a cyclical process. What was the heat transfer into this engine
You have a string with a mass of 0.0127 kg. You stretch the string with a force of 9.19 N, giving it a length of 1.83 m. What is the wavelength of the standing wave you create
A thin gold ring of radius 1.02 cm carries a uniform charge per unit length of 1.02e-14 C/m. Find the electric field on the axis of the ring 1.09 cm from the center magnitude.
the speed of light in a material is 0.41 c. what is the critical angle of a light ray at the interfacce between the material and a vacuum
A Piece of ice of mass mi at 0 C is placed in water of mass mw at 20 C. The system is in a container of negligible heat capacity, what is the equilibrium temperature of the system
metal sphere of radius 32 cm has a net charge of 3.0 multiply.gif 10-8 C. What is the electric field at the sphere's surface
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