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How many photons are emitted during 7.0 s of operation of a red laser pointer? The device outputs 2.5 Watts at a 635 nm wavelength.
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Question: In a pig-calling contest, a caller produces a sound with an intensity level of 107 dB. How many such callers would be required to reach the pain level of 120 dB? The response must be typed, single spaced, must ...
Question: A sump pump (used to drain water from the basement of houses built below the water table) is draining a flooded basement at the rate of 0.55 L/s, with an output pressure of 2.9 Ã- 105 N/m2. a) The water enters ...
Question: A projectile is fired from ground level at time t=0, atan angleθ with respect to the horizontal. It has an initialspeed v0 . In this problem we are assuming that the ground islevel. Part A Find the time tH it ...
Question: A researcher observes hydrogen emitting photons of energy 1.13eV . What are the quantum numbers of the two states involved in the transition that emits these photons? Express your answers as integers separated ...
Question: A simple pendulum consisting of a bob of mass attached to a string of length swings with a period . a) If the bob's mass is doubled, approximately what will the pendulum's new period be? b) If the pendulum is b ...
Question: Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass m and radius of orbit L. The satellites fire rockets that provide the force neede ...
A rock takes 2.1 s to hit ground when it is thrown straigh up from a cliff with initial velocity of 7.5 m/s. Calculate height of the cliff in m & length it would take to reach the ground if thrown down with same speed.
A woman wishing to know the height of a mountain measures the angle of elevation of the mountaintop as 12°. After walking 1.23 km closer to the mountain on level ground, she finds the angle to be 15.8°. Find the height o ...
Question: Positive point charges q = 7.00uC and q'= 4.00uC are moving relative to an observer at point P, as shown in the figure (Figure 1). The distance d is 0.130m , v = 4.60 x 10^6 m/s , and v'= 9.20 x 10^6 m/s Part A ...
Question 1) Preparing for a turn , a bus slows down an acceleration of -2/0 m/s^2 calculate how much time it takes the bus to slow down from 14.0 m/s to 5.0 m/s Question 2) The acceleration of a train that increases its ...
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