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In a certain time, light travels 4.78 km in a vacuum. During the same time, light travels only 2.37 km in a liquid. What is the refractive index of the liquid?
A 52kg ballet dancer stands on her toes during a performance with four square inches (26cm2) in contact with the floor. What is the pressure exerted by floor over the area of contact in some cases.
A 60 kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. determine her altitude as she crosses the bar
A 5.0 nC point charge sits at x = 0. At the same time, a 4300 N/C uniform electric field (created by distant source charges) points in the positive x-direction. A. At what point along the x-axis, if any, would a proton experience no net force? B. ..
Use approximate relationships to find the electric field at a point 4 cm from the axis, measured radially outward from the midpoint of shell.
A 1.50 kg object is held 1.20m above a relaxed massless, vertical spring with a force constant of 320 N/m. The object is dropped onto the spring.
Find out the lengths of acceleration and deceleration phases
Light of wavelength 60nm illuminates a hydrogen atom in an excited state. What energy level was the electron in initially
A long, straight wire runs along the y-axis. The wire carries a current in the positive y-direction that is changing as a function of time according to i = 8 A + (0.2 A/s)t. A loop of wire is placed in the xy-plane near the y-axis. The loop has di..
A heat engine operates between a high-temperature reservoir at 610K and a low-temperature reservoir at 320K. What is the net change in entropy as a result of this cycle?
Consider the system with m1 = 24kg, m2 = 14.60kg, R = 0.1400m, and the mass of the pulley M = 5.0kg. Object m2 is resting on the floor, and object m1 is 4.600m above the floor when it is released from rest. The pulley axis is frictionless. The cor..
q1. a mountain climber in the process of crossing between two cliffs by a rope pauses to rest. she weighs 550 n. as
Consider an optical gain medium that has two levels at E 1=1.50 eV and E 2=3.50 eV. What is the spontaneous emission wavelength
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