A hockey puck slides off the edge of a horizontal platform with an initial velocity of 28.0 m/s horizontally in a city where the acceleration due to gravity is 9.81 m/s2. The puck experiences no significant air resistance as it falls
The height of the platform above the ground is 2.00 m. What is the angle below the horizontal of the velocity of the puck just before it hits the ground? A) 77.2°
B) 72.6°
C) 12.8°
D) 12.6°
E) 31.8°
D
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Assuming the radius of diatomic molecules is approximately 1.0 × 10-10 m, for what pressure will the mean free path in room-temperature (20°C) nitrogen be 4.6 m?
The Boltzmann constant is 1.38 × 10-23 J/K, Avogadro's number is 6.02 × 1023 molecules/mole, and the ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K. A) 4.9 × 10-8 atm B) 6.9 × 10-8 atm C) 1.5 × 10-7 atm D) 2.2 × 10-7 atm
A satellite follows an elliptical orbit about a planet as shown. The speed of the satellite is greatest when the satellite is in position
1) A. 2) B. 3) C. 4) D. 5) same at all points in its orbit. At which position is there no component of force in the direction of the satellite's instantaneous velocity? 6) A 7) B 8) C 9) D 10) A component of force exists in the direction of instantaneous velocity at every point along the orbital path.
Two solenoids of equal length are each made of 2000 turns of copper wire per meter. Solenoid I has a 5.00 cm radius; solenoid II a 10.0 cm radius. When equal currents are present in the two solenoids, the ratio of the magnitude of the magnetic field BI along the axis of solenoid I to the magnitude of the magnetic field BII along the axis of solenoid II, BI/BII, is
a. 1/4. b. 1/2. c. 1. d. 2. e. 4.
Which of the following discoveries was NOT made by Voyager 1 or 2?
A) Jupiter has an encircling ring. B) Jupiter's magnetosphere extends beyond the orbit of Saturn. C) Jupiter has cloud bands in its upper atmosphere. D) Jupiter's moons are as varied as the surfaces of the terrestrial planets. E) Jupiter's Great Red Spot is characterized by swirling patterns much like a hurricane.