Free Fall: A ball is thrown straight up with a speed of 30 m/s, and air resistance is negligible.(a) How long does it take the ball to reach the maximum height?(b) What is the maximum height reached by the ball?(c) What is its speed after 4.2 s?
What will be an ideal response?
(a) 3.1 s (b) 46 m (c) 11 m/s
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Relative Velocity: A plane flies directly from city A to city B, which are separated by 2300 mi. From A to B, the plane flies into a 65 mi/h headwind. On the return trip from B to A, the wind velocity is unchanged. The trip from B to A takes 65 min less than the trip from A to B. What is the airspeed (assumed constant) of the plane relative to the air (that is, the airspeed)?
A. 530 mi/h B. 400 mi/h C. 480 mi/h D. 610 mi/h
A 1000-kg car is slowly picking up speed as it goes around a horizontal curve whose radius is 100 m. The coefficient of static friction between the tires and the road is 0.350. At what speed will the car begin to skid sideways?
A) 9.25 m/s B) 23.6 m/s C) 34.3 m/s D) 35.0 m/s E) 18.5 m/s
A barge is 10 m wide and 60 m long and has vertical sides. The bottom of the boat is 1.2 m below the water surface. What is the weight of the barge and its cargo, if it is floating in fresh water of density 1000 kg/m3?
A) 3.5 MN B) 6.4 MN C) 6.8 MN D) 7.1 MN E) 9.5 MN
The continual stream of charged particles
projected outward from the Sun's surface into space are referred to as the a) solar wind. b) sunspot cycle. c) chromosphere. d) umbra.