2A hw – 1 SI Units, Conversions and Estimations 1. Convert the following units: b. 230 cm? to m². c. 120 mph to m/s a. 150 km/hr to m/s. d. 68 m³ to cm³. e. 5.0 L to m³. 2. The density of water is p= 1000 kg/m³. Express the density in g/cm³. 3. The density of mercury is 13.6 g/cm³. Express the density in kg/m³. 4. Express a light year (the distance that light travels in a year) in meters. Take the speed of light in vacuum to be 3.0 × 108 m/s. Use scientific notation. 5. Pulsars, or neutron stars, typically have a radius of 20 km and a mass equal to that of our sun (2.0 × 1030 kg). What is the average density of such a pulsar? Use SI units and scientific notation. 6. Estimate the distance traveled by our planet around the Sun in 10 years, if the distance between the sun and earth is about 1.5 x 1011 m, (called an astronomical unit AU) and the path is circular. Use SI units and scientific notation for your answer. 7. Gravitational accelerations in the galaxy are usually very small: our sun, for -as it orbits the Milky Way. example, experiences the acceleration of about 2 Express this acceleration in mi/s² (1 A=10-1º m). 8. Under normal conditions, there are about 1019 particles in 1.0 cm of air. Estimate the number of particles present in your bedroom. 9. Estimate the number of water molecules in a 250 cm glass of water. Each molecule's dimension is about 3.0 x 10-10 m (3.0 Å). 4257 10. The area of a human is approximately given as A(m,h)=.0072m*h where m is his/her mass (kg) and h is his/her height (cm). Estimate your surface (in m²), area. 11. The number of protons in the known universe is about 1080, and the radius of a proton is about 10-15 m. Estimate the volume of a sphere containing all of these protons if they were placed in contact with each other? 10 make - up labs or activities am ame

Assume it takes 7.00 min to fill a 30.0-gal gasoline tank, (a) (Calculate the rate at which the tank is filled in gallons per second. (b) (Calculate the rate at which the tank is filled in cubic meters per second. (c) Determine the time interval, in hours, required to fill a 1.00-m3 volume at the same rate. (1 U.S. gal = 231 in.3)

The distance to the Sun is 93 miIlion miles. What is the distance to the Sun in the appropriate SI units?

Units and Standards What is the difference between a base unit and a derived unit? (b) What is the difference between a base quantity and a derived quantity? (c) What is the difference between a base quantity and a base unit?

(a) How many significant figures are in the numbers 99 and 100? (b) If the uncertainty in each number is 1, what is the percent uncertainty in each? (c) Which is a more meaningful way to express the accuracy of these two numbers, significant figures or percent uncertainties?

The average life expectancy in Japan is 81 years. What is this time in SI units?

The density (p) of the atmosphere as a function of altitude (A) can be approximated by the model shown in the graph. What are the units of the constant 1.225? O A. dimensionless O B. kg m^3 OC. kg/m^3 O D. m^2/kg p= 1.225 e0.0001 A O E. m OF. kg O G. m^3/kg O H. kg/m^2 Altitude (A) (m] Density (p) [kg/m®]

Can you answer these physics questions?

The speed of sound is 1100 ft/sec at sea level.   a. Express the speed of sound in mi/hr.  b. Change the speed of sound to mi/year. Let 365 days=1 year.

200 kilolitres of water was consumed inour house last month. this quantity of water corresponds to:   a. 20000 litres   b. 200 m3   c. 0.2 m3   d. 200000 mm3   e. None of a, b, c and d