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An 81 mm focal-length lens is used to focus an image on the film of a camera. The maximum distance allowed between the lens and the film plane is 140 mm.
a. How far ahead of the film should the lens be if the object to be photographed is 10.0m away?
b. How far ahead of the film should the lens be if the object to be photographed is 2.8 m away?
c. How far ahead of the film should the lens be if the object to be photographed is 1.2 m away?
d. What is the closest object this lens could photograph sharply?
A 200-kg crate is pushed horizontally with a force of 715 N. If the coefficient of friction is 0.20, compute the acceleration of the crate.
A 100 Ohm resistor dissipates heat to its surroundings, isothermally. The resistor maintains a constant temperature of 300 K. How much energy does the surroundings absorb
A patient is going to be prescribed bifocals which will be 3.20 cm from the eye, Without the bifocals, what is the patient's near point
An Australian emu is running due east in a straight line at a speed of 17.6 m/s and slows down to a speed of 15.7 m/s in 7.7 s. Assuming that the acceleration remains the same, what is the bird's velocity after an additional 2.0 s has elapsed?
a pair of parallel plates is charged by a 12-v battery. if the electric field between the plates is 1200 n/c, how far apart are the plates
A hot-air balloon has a volume of 2741 m3. The density of the air outside the balloon is 1.205 kg/m3. How much weight can the balloon lift
A sledge loaded with bricks has a total mass of 17.2 kg and is pulled at constant speed by a rope inclined at 20.3° above the horizontal. What is the mechanical energy lost due to friction
A 4.95-kg ball, moving to the right at a velocity of +1.60 m/s on a frictionless table, Find the final velocities of the balls if the collision meet the following conditions
A certain gyroscope consists of a uniform disk with a 52 cm radius mounted at the center of an axle that is 12 cm long and of negligible mass. what is the precession rate
A 0.80 kg body oscillates on a spring that, when extended 3.0 mm from equilibrium, has a restoring force of 5.0 N. find the angular frequency of oscillation
A three-step cycle is undergone by n moles of an ideal diatomic gas: (1) the temperature of the gas is increased from T_1 to T_2 at constant volume, compute the efficiency of the cycle in terms of T_1 and T_2
In a liquid with a density of 1500 kg/m^3, longitudinal waves with a frequency of 360 Hz are found to have a wavelength of 7.70 m. Calculate the bulk modulus of the liquid
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