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1A delivery vehicle accelerates uniformly from rest to 18 m/s in 6.0 s. What are its acceleration and distance travelled?
A.3.0 m/s^2 and 54 m
B.3.0 m/s^2 and 108 m
C.1.5 m/s^2 and 54 m
D.0.33 m/s^2 and 27 m
Explanation: Acceleration is (18 - 0)/6.0 = 3.0 m/s^2. The average speed is (0 + 18)/2 = 9.0 m/s, giving a distance of 9.0 * 6.0 = 54 m.
2A crane lifts a 2,400 kg container vertically at a constant 1.2 m/s. Using g = 9.8 m/s^2 and neglecting losses, what mechanical power is delivered to the container?
A.23,520 W
B.28,224 W
C.19,600 W
D.2,880 W
Explanation: At constant speed the lifting force equals the weight, 2,400 * 9.8 = 23,520 N. Mechanical power is force times speed, so P = 23,520 * 1.2 = 28,224 W.
3A resistive load draws a steady 15 A from a 230 V supply for 4.0 hours. How much electrical energy does it consume?
A.3.45 kWh
B.13.8 kWh
C.55.2 kWh
D.13,800 kWh
Explanation: Power is VI = 230 * 15 = 3,450 W = 3.45 kW. Multiplying by 4.0 hours gives 13.8 kWh.
4An ocean wave has a wavelength of 45 m and a frequency of 0.20 Hz. What is its propagation speed?
A.9.0 m/s
B.225 m/s
C.0.0044 m/s
D.11.25 m/s
Explanation: Wave speed is frequency multiplied by wavelength. Thus v = 0.20 * 45 = 9.0 m/s.
5Light passes from air (n = 1.00) into water (n = 1.33) at an incidence angle of 30.0 degrees to the normal. Using Snell's law, what is the refraction angle to the nearest tenth of a degree?
A.22.1 degrees
B.41.7 degrees
C.37.6 degrees
D.19.5 degrees
Explanation: Snell's law gives sin(theta) = 1.00 * sin(30.0 degrees)/1.33 = 0.3759. Taking the inverse sine gives 22.1 degrees, closer to the normal in water.
6A hypothetical water sample has [H3O+] = 2.5 * 10^-5 mol/L. Using the concentration approximation pH = -log10[H3O+], what is its pH to one decimal place?
A.4.6
B.5.4
C.9.4
D.3.6
Explanation: The logarithm is log10(2.5) - 5 = 0.398 - 5 = -4.602. Negating it and rounding gives pH 4.6.
7What mass of NaCl (molar mass 58.44 g/mol) is needed to prepare a final solution volume of 500 mL at 0.200 mol/L?
A.5.84 g
B.11.69 g
C.2.92 g
D.58.44 g
Explanation: The required amount is 0.200 mol/L * 0.500 L = 0.100 mol. Multiplying by 58.44 g/mol gives 5.844 g, or 5.84 g.
8For the exothermic equilibrium N2(g) + 3 H2(g) <=> 2 NH3(g), which change increases the equilibrium proportion of ammonia?
A.Compressing the mixture at constant temperature
B.Increasing the temperature
C.Adding an inert gas at constant volume and temperature
D.Removing nitrogen from the mixture
Explanation: Compression favors the side with fewer gas particles: two moles of product rather than four moles of reactants. Increasing temperature favors the endothermic reverse reaction instead.
9Propane burns according to C3H8 + 5 O2 -> 3 CO2 + 4 H2O. For this exercise use a gas molar volume of 22.4 L/mol and a propane molar mass of 44.1 g/mol. What oxygen volume is consumed by 44.1 g of propane?
A.112 L
B.22.4 L
C.67.2 L
D.89.6 L
Explanation: The propane amount is 44.1/44.1 = 1.00 mol. It needs 5.00 mol of oxygen, corresponding to 5.00 * 22.4 = 112 L.
10Which organelle produces most ATP from aerobic cellular respiration in a typical eukaryotic cell?
A.Mitochondrion
B.Golgi apparatus
C.Ribosome
D.Endoplasmic reticulum
Explanation: Mitochondria contain the machinery for the citric acid cycle and oxidative phosphorylation. Oxidative phosphorylation generates most ATP during aerobic respiration.

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