A 0.17-kg baseball is thrown with a speed of 38 m/s and it is hit straight back toward the pitcher with a speed of 62 m/s. What is the magnitude of the impulse exerted by the bat on the ball?
What will be an ideal response?
17 N ? s
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A stepped steel shaft (G 5 75 GPa) with diameters d1 5 36 mm and d2 5 32 mm is twisted by torques T at each end. Segment lengths are L1 5 0.9 m and L2 5 0.75 m. If the allowable shear stress is 28 MPa and maximum allowable twist is 1.8°, the maximum permissible torque is approximately:
(A) 142 N?m
(B) 180 N?m
(C) 185 N?m
(D) 257 N?m
A 10-kg object, hung by an ideal spring, causes the spring to stretch 2.0 cm. What is the spring constant for this spring?
A) 5.0 N/cm B) 49 N/cm C) 0.20 N/cm D) 20 N/m E) 0.0020 N/cm
Which one of these is the main cause of the seasons on Earth?
A. The location of the Earth in its orbit around the Sun. B. Daily rise and set of the Sun C. The Earth's proximity to the Sun D. The angle of the tilt of the Earth on its axis.
A +15-nC point charge is placed on the x axis at x = 1.5 m, and a ?20-nC charge is placed on the y axis at y = ?2.0m. What is the magnitude of the electric field at the origin?
A. 105 N/C B. 15 N/C C. 75 N/C D. 45 N/C E. 60 N/C