The position of an object that is oscillating on an ideal spring is given by the equation x = (12.3 cm) cos[(1.26s-1)t]. At time t = 0.815 s, (a) how fast is the object moving? (b) what is the magnitude of the acceleration of the object?
What will be an ideal response?
(a) 13.3 cm/s (b) 10.1 cm/s2
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A steel bracket ABCD (EI 5 4.2 3 106 N # m2), with span length L 5 4.5 m and dimension a 5 2 m, is subjected to load P 5 10 kN at D. The maximum deflection at B is approximately:
(A) 10 mm
(B) 14 mm
(C) 19 mm
(D) 24 mm
A 0.120-pF parallel-plate capacitor is charged to a potential difference of 10.0 V and then disconnected from the battery. A cosmic ray burst creates 1.00 × 10^6 electrons and 1.00 × 10^6 positive charges between the plates. If the charges do not recombine, but reach the oppositely charged plates, by how much is the potential difference between the capacitor plates reduced?
a. 1.33 V b. 7.34 V c. 8.67 V d. 1,330 V e. 8,670 V
Which of the following electromagnetic radiations has the greatest frequency?
a. Ultraviolet b. Infrared c. Radio d. Visible
When we drink through a straw, the liquid is actually
1) pulled up 2) sucked up 3) pushed up by 4) atmospheric pressure. 5) reduced pressure in the straw. 6) surface tension. 7) capillarity.