What happens to a sample of water when it is heated between 0°C and 4°C?
a. Its volume increases.
b. Its volume is reduced.
c. It vaporizes.
d. Nothing changes except its temperature.
b
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The escape velocity of an object depends on I. the mass of that object. II. the mass of the object trying to escape. III. the distance from the center of the object and the escaping object. IV. the speed of light
a. I, II, III, & IV b. I & II c. I & III d. I, II, & IV e. I, III, & IV
The average density of blood is 1.06 × 103 kg/m3. If you donate a pint of blood to the Red Cross, how many grams of blood have you donated? (2.00 pt = 1.00 qt, 1.00 L = 1000 cm3, 1.00 qt = 0.947 L, and density is mass per unit volume.)
A) 502 g B) 0.502 g C) 5020 g D) 5.02 × 105 g E) 5.02 g
An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor, and inductor, or a capacitor. At time t = 0 the voltage is zero
At time t = T/4 the current in the unknown element is equal to zero, and at time t = T/2 the current is I = -Imax, where Imax is the current amplitude. What is the unknown element? A) a resistor B) an inductor C) a capacitor D) an inductor or a capacitor
What is the correct unit of work expressed in SI units?
A) kg m/s2 B) kg m2/s C) kg m2/s2 D) kg2 m/s2