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A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 58.05 diopters, and the lens-to-retina distance is 1.728 cm.
a) How far is the blackboard from her eyes?
b) If the writing on the blackboard is 4.67 cm high, what is the height of the image on the retina?
What is the velocity of the plank relative to the surface of ice.
A ball is thrown toward a cliff of height h with a speed of 30m/s and an angle of 60? above horizontal, What was the maximum height of the ball
A horizontal bar 2.361 m long with a mass of 91.27 kg is hinged to a wall. What is the angle between the cable and the bar
A 0.105-kg ball is dropped from rest. If magnitude of the ball's momentum is 0.790 kg · m/s just before it lands on the ground, from what height was it dropped.
A cyclist uses 27,000 joules per minute (this is about 385 food Calories per hour) to cycle at a constant pedaling rate of 450 radians per minute along a flat road using a gear ratio of 4
Radiation from the head is a major source of heat loss from the human body. Model a head as a 20-cm-diameter, 20-cm-tall cylinder with a flat top. what is the net rate of heat loss on a chilly
Mary throws a ball to Suzy, who is standing 25 meters away. Suzy catches the ball from the same height at which it was thrown. calculate initial vertical velocity and Horizontal velocity
The speed of a bobsled is increasing because it has an acceleration of . At a given instant in time, the forces resisting the motion, including kinetic friction and air resistance, total 500 N.
What is the magnitude of the electric field at this point?
A layer of transparent plastic (n = 1.63) on glass (n = 1.52) looks dark when viewed in reflected light whose wavelength is 576 nm in vacuum. Find out the two smallest possible nonzero values for the thickness of the layer.
A 0.48-kg object connected to a light spring with a force constant of 23.6 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest.
A block of mass m = 0.2 kg, in simple harmonic motion, has an amplitude of 3.5 cm and a maximum speed of 70 cm/s. What is the potential energy of the system when the block is 2 cm away from the equilibrium position?
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