Suppose a body sliding up a ramp is decelerating at a constant rate. Its speed will ________ by the same amount each second.
What will be an ideal response?
decrease
shrink
be decreasing
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Potential: A proton with a speed of 2.0 × 105 m/s accelerates through a potential difference and thereby increases its speed to 4.0 × 105 m/s. Through what magnitude potential difference did the proton accelerate? (e = 1.60 × 10-19 C , mproton = 1.67 × 10-27 kg)
A. 630 V B. 210 V C. 840 V D. 1000 V E. 100 V
Which of the following best describes the modern definition of a constellation?
A) a region of the celestial sphere B) a pattern of bright stars in the sky C) a Greek mythological figure D) a collection of stars that are near one another in space E) a group of stars that all lie at about the same distance from Earth
If a two-body collision is not head-on, then we may always assume that:
a. momentum is conserved. b. kinetic energy is conserved. c. neither momentum nor kinetic energy are conserved. d. both momentum and kinetic energy are conserved.
A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000 N
If the hose delivers 40 kg of water per second, what is the minimum velocity of the stream needed to knock down the door, assuming the water doesn't bounce back? A) 15 m/s B) 20 m/s C) 25 m/s D) 30 m/s