A 120 N force is applied at an angle of 30.0 degrees above the horizontal to a 4.00 kg box. The box moves a horizontal distance of 8.00 meters. The change in the kinetic energy of the box is
A. 667 J.
B. 750 J.
C. 831 J.
D. 890 J.
E. 920 J.
C. 831 J.
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Spherical Mirrors: An object that is 47.5 cm tall forms an image that is 38.6 cm tall and 14.8 cm from a spherical mirror. How far is the object from the mirror?
A. 124 cm B. 47.6 cm C. 18.2 cm D. 12.0 cm
A butterfly moves with a speed of v = 12.0 m/s. The x-component of its velocity is 8.00 m/s. The angle between the direction of its motion and the x-axis must be
A) 60.0° B) 41.8° C) 48.2° D) 30.0° E) 53.0°
A 10-meter-long spear is thrown at relativistic speeds through a 10-meter-long pipe. (Both these dimensions are measured when each is at rest.) When the spear passes through the pipe
A) the spear appears to shrink so the pipe completely covers it. B) the pipe appears to shrink so the spear extends from both ends. C) both appear to shrink equally so the pipe barely covers the spear. D) any of these, depending on the motion of the observer (moving with the spear, at rest with the pipe, and so on). E) none of the above
The distance between the ruled lines on a grating is 1900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the angular width of the gap between the first order spectrum and the second order spectrum? A) 3.3° B) 4.3° C) 5.3° D) 6.3° E) 2.3°