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Question: When a 2.50 kg object is hung vertically on a certain light spring described by hooke's law, the spring stretches 2.76 cm. What's the force constant of the spring?
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Describe a wave pulse and a continuous progressive (traveling) wave. Describe and give examples of transverse and longitudinal waves. Which of acceleration, age, speed, temperature, and velocity are vector quantities?
An express train passes through a station. It enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.150 m/s2 as it goes through. How fast is it going when the nose leaves the station
A 1200 turn coil in a dc motor has an area per turn of 2.2 * 10-2m-2. What is the current in the coil
A fan is spinning at 900 rpm. When its motor is turned off it makes 75 rev before coming to a stop. Find the moment of Inertia of the fan
Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. what is the work function for this metal
The maximum angular magnification of a magnifying glass is 12.0 when a person uses it who has a near point that is 25.0 cm from his eyes. Obtain the focal length of the objective
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1020 Hz. The bird-watcher, however, hears a frequency of 1060 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
A Helium-Neon laser (?=633 nm) illuminates a diffraction grating. What is the spacing between the slits of the grating
The length of a moving spaceship is 27.0 m according to an astronaut on the spaceship. If the spaceship is contracted by 14.5 cm according to an Earth observer, what is the speed of the spaceship
A law enforcement officer in an intergalactic "police car" turns on a red flashing light and sees it generate a flash every 1.3 s. How fast is the "police car" moving relative to the earth
Two narrow, parallel slits separated by 0.200 mm are illuminated by green light (? = 546.1 nm). Calculate the distance between the first and second dark bands
The threshold intensity for a human eye to sense the presence of light is 50 photons falling on the retina within a period of 0.1 s. Estimate how far away the star can be away
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