PHYS 2211 Module 1 Self Assessment Practice Problems

Module 1 Self Assessment Practice Problems

Soccer fields vary in size. A large soccer field is 115 m long and 85.0 m wide. What is its area in square feet? (Assume that 1 m = 3.281 ft.)
Answer: 1.05 x 105 ft2 (Click and drag over the answer to highlight it)
What is the height in meters of a person who is 6 ft 1.0 in. tall? (Assume that 1 in. = 2.54 cm)
Answer: 1.85 m
The speed limit on some interstate highways is roughly 100 km/h. (Assume that 1 mi. = 1609 m)
(a) What is this in meters per second?
(b) How many miles per hour is this?
Answer: (a) 27.8 m/s, (b) 62.2 mi/h
The speed of sound is measured to be 342 m/s on a certain day. What is this measurement in kilometers per hour?
Answer: 1.23 x 103 km/h
The density of aluminum is 2.7 g/cm3. What is the density in kilograms per cubic meter?
Answer: 2.7 x 103 km/m3
Tectonic plates are large segments of Earth’s crust that move slowly. Suppose one such plate has an average speed of 4.0 cm/yr.
(a) What distance does it move in 1.0 s at this speed?
(b) What is its speed in kilometers per million years?
Answer: (a) 1.3 x 10-9 m, (b) 40 km/My
The average distance between Earth and the Sun is 1.5 x 1011 m. (Assume that 1 mi. = 1609 m)
(a) Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second.
(b) What is this speed in miles per hour?
Answer: (a) 3.0 x 104 m/s, (b) 6.7 x 104 mi/h
Light travels at a speed of about 3 x 108 m/s. A light-minute is the distance light travels in 1 min. If the Sun is 1.5 x 1011 m from Earth, how far away is it in light-minutes?
Answer: 8.3 light-minutes
An electron has a mass of 9.11 x 10-31 kg. A proton has a mass of 1.67 x 10-27 kg. What is the mass of a proton in electron-masses?
Answer: 1.83 x 103 electron masses
The density of nuclear matter is about 1018 kg/m3. Given that 1 mL is equal in volume to 1 cm3, what is the density of nuclear matter in megagrams per microliter (that is, Mg/µL)?
Answer: 106 Mg/µL