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A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 62.12 diopters, and the lens-to-retina distance is 1.629 cm.
(a) How far is the blackboard from her eyes?
(b) If the writing on the blackboard is 7.32 cm high, what is the height of the image on her retina?
The speed of sound in bone is 3500 m/s. How much time does it take the echo of a sound wave to travel from the back of the bone to the front of the bone if the bone is 2.50 cm thick.
Does an apple tree exert a gravitational force on the earth and if so, how large of a force, Consider and explain this question when the apple is attached to the tree
Two loudspeakers emit 400Hz notes. One speaker sits on the ground. The other speaker is in the back of a pickup truck, What is the truck's speed in m/s
A cube of ice is taken from the freezer at -9.4°C and placed in a 94 g aluminium calorimeter filled with 315 g of water at room temperature of 20°C. The final situation is observed to be all water at 19°C. What was the mass of ice cube.
A balloon is initially stationary and full of air. The air in the balloon has a mass of 2 g. What speed does the balloon have
If both the ring and the rod are warmed together, what temperature must they both reach so that the ring barely slips over the rod.
Given that the goal is to allow all vehicles to come safely to a stop before reaching the intersection, calculate the maximum desired speed limit
How much heat must be removed from 0.40 kg of water at 0 degrees C to make ice cubes at 0 degrees C?
A Submarine dives to a depth of 312 feet in the ocean, What is the fource (in pounds) acting on a hatch that has an area of 4.7 square feet
A turntable that spins at a constant 73.0 {rm rpm} takes 3.60 {rm s} to reach this angular speed after it is turned on. Find its angular acceleration (in {rm rad/s^{2}}), suppose it to be constant, and the number of degrees it turns through while ..
explain how would you evaluate much accountability for AIS security falls on management in a large and a small accounting firm.
David is driving a steady 21 m/s when he passes Tina, who is sitting in her car at rest. Tina begins to accelerate at a steady 2.20 m/s^2 at the instant as David passes.
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