Q: A 5.0 - kg block is pushed 3.0
A 5.0 - kg block is pushed 3.0 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of θ = 30° with the horizontal, as shown in Figur...
See AnswerQ: A child’s pogo stick (Fig. P5.77) stores
A child’s pogo stick (Fig. P5.77) stores energy in a spring (k = 2.50 x 104 N/m). At position Ⓐ (x1 = -0.100 m), the spring compression is a maximum and the child i...
See AnswerQ: A hummingbird hovers by exerting a downward force on the air equal
A hummingbird hovers by exerting a downward force on the air equal, on average, to its weight. By Newton’s third law, the air exerts an upward force of the same magnitude on the bird’s wings. Find the...
See AnswerQ: In the dangerous “sport” of bungee jumping, a daring
In the dangerous “sport” of bungee jumping, a daring student jumps from a hot air balloon with a specially designed elastic cord attached to his waist. The unstretched length of the cord is 25.0 m, th...
See AnswerQ: Apollo 14 astronaut Alan Shepard famously took two golf shots on the
Apollo 14 astronaut Alan Shepard famously took two golf shots on the Moon where it’s been estimated that an expertly hit shot could travel for 70.0 s through the Moon’s reduced gravity, airless enviro...
See AnswerQ: A truck travels uphill with constant velocity on a highway with a
A truck travels uphill with constant velocity on a highway with a 7.0° slope. A 50. - kg package sits on the floor of the back of the truck and does not slide, due to a static frictional force. During...
See AnswerQ: As a 75.0 - kg man steps onto a bathroom
As a 75.0 - kg man steps onto a bathroom scale, the spring inside the scale compresses by 0.650 mm. Excited to see that he has lost 2.50 kg since his previous weigh - in, the man jumps 0.300 m straigh...
See AnswerQ: Choose the best answer. A car traveling at constant speed has
Choose the best answer. A car traveling at constant speed has a net work of zero done on it. (a) True (b) False (c) The answer depends on the motion.
See AnswerQ: A loaded ore car has a mass of 9.50 x
A loaded ore car has a mass of 9.50 x 102 kg and rolls on rails with negligible friction. It starts from rest and is pulled up a mine shaft by a cable connected to a winch. The shaft is inclined at 30...
See AnswerQ: A cat plays with a toy mouse suspended from a light string
A cat plays with a toy mouse suspended from a light string of length 1.25 m, rapidly batting the mouse so that it acquires a speed of 2.75 m/s while the string is still vertical. Use energy conservati...
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