Basic Physics of Mass, Heat, Balance Equations, Waves and pH

1. If an object has a mass of 1.0 Kg, what is its weight on Jupiter with 2.5 times the gravitational force as on earth?
Solution:

2. What net force is necessary to accelerate a 1000-Kg space probe 8m/s2?
Solution:

3. How much heat must be added to raise the temperature of a cup of coffee (250g) from 25.5ºC to 95.6ºC. Assume that the coffee has a specific heat of 4.187?
Solution:

4. Which of the following reactions is not correctly balanced?
a. 4Fe + 3O2 → 2Fe2O3
b. C3H8 + 10O2 → 3CO2 + 4H2O
c. N2 + 3H2 → 2NH3
d. 2H2O → 2H2 + O2
Solution:
b. C3H8 + 10O2 → 3CO2 + 4H2O
The above equation is not balanced.
The balanced equation would be:
C3H8 + 5O2 → 3CO2 + 4H2O

5. How long would it take for a radio wave to travel 8.00 x 1010 m?
Solution:
Radio waves travel with the speed of light.

6. A pH 2 solution has _____ times the concentration of hydroxide as a pH 6 solution.
Solution:
Solution:
A pH 2 solution has 10000 times the concentration of hydroxide as a pH 6 solution.

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