A 200-g hockey puck is launched up a ramp that is inclined at a 30° angle above the horizontal
The coefficients of static and kinetic friction between the puck and the ramp are µs = 0.40 and µk = 0.30, respectively, and the puck's initial velocity at the base is 3.8 m/s parallel to the sloping surface of the ramp. What speed does the puck have when it slides back down to its starting point?
2.1 m/s
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The leaves of a positively charged electroscope diverge more when an object is brought near the knob of the electroscope. The object must be:
A) a conductor B) an insulator C) positively charged D) negatively charged E) uncharged
Two particles, each having a mass of 3.0 ?g and having equal but opposite charges of magnitude 5.0 nC, are released simultaneously from rest when the two are 5.0 cm apart. What is the speed of either particle at the instant when the two are separated by 2.0 cm?
a. 2.1 m/s b. 1.5 m/s c. 1.8 m/s d. 2.4 m/s e. 3.2 m/s
The instruments of the Mars Odyssey spacecraft detected water frozen in the soil over large areas of Mars
a. True b. False Indicate whether the statement is true or false
Energy in the Electric Field: A 25.0-V potential source (a battery) is connected across the plates of a 6.66-µF air-filled parallel-plate capacitor having plates that are 1.22 mm apart. What energy density does it produce between the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
Fill in the blank(s) with the appropriate word(s).