PHY01 PRELIM EXAM

At standard temperature and pressure, carbon dioxide has a density of 1.98 kg/m³.  What volume does 0.75 kg of carbon dioxide occupy at standard temperature and pressure?

      

• 0.38 m³                                      

• 1.49 m³                        

• 3.8 m³   

        

• 0.86m³               

What mass of water (at 4.0 °C) can be contained in a rectangular box whose dimensions are 20.0 cm by 5.00 cm by 2.00 cm?  The density of water at 4.0 °C is 1.000 x 10³ kg/m³ or 1 g/cm³

• 5.0 g

• 200000.0 g

• 200.0 g

• 50.0 g

The density of iron is 7860 kg/m³.  What is the mass of an iron sphere whose diameter is 1 m? (Volume of a sphere= V =4/3πr ³)

• 4115.5 kg

• 0.5236 kg

• 5114 kg

• 15011. 6 kg

How much force does the atmosphere exert on one side of a vertical wall 5.00-m high and 12.0-m long? (1 atm= 101325Pa= 1.01 x10⁵ Pa= 101.325 kPa)

• 6.08 x 10⁶ N

        

• 6.08 x 10⁵ N

        

• 1688.8 N

• 1.69 x 10⁶ N

       A child wants to pump up a bicycle tire so that its pressure is 3.0 x 10⁵ Pa above that of atmospheric pressure.  If the child uses a pump with a circular piston 0.035 m in diameter, what force must the child exert? (Area of a Circle= πr²)

• 144 N

• 289 N

• 120 N

• 240 N

A gas sample is confined within a chamber that has a movable piston.  A small load is placed on the piston; and the system is allowed to reach equilibrium.  If the total weight of the piston and load is 50.0 N and the piston has an area of 5.0 x 10^-4 m², what is the TOTAL pressure exerted on the piston by the gas? 

Note: Atmospheric pressure is 1.013 X 10⁵ Pa.

Total Pressure= P_exerted + P_atmosphere

• 1 x 10⁵ Pa

• 2 x 10⁵ Pa

• 1.4 x 10⁵ Pa

• 2.4 x 10⁵ Pa

Using the value of atmospheric pressure at sea level, 1 x 10⁵ Pa, estimate the total mass of the earth’s atmosphere above a 10-m² area.

Note: Force= Weight= mg

• 1 x 10⁵ kg

• 5 x 10⁴ kg

• 5 x 10^-5 kg

• 1 x 10^-5 kg

In a classroom demonstration, a 75-kg physics professor lies on a “bed of nails.”  The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board.  While the professor is lying down, approximately 2000 nails make contact with his body.

How much Force does each Nail exert on the professor's body?

Note : F= W= mg

• 735 N

• 0.379 N

• 0.368 N

• 1470000 N

A swimming pool has the dimensions shown in the drawing.  It is filled with water to a uniform depth of 12.00 m.

Note:  The density of water = 1.00 x 10³ kg/m³

What is the pressure exerted on the bottom of the swimming pool?

• 1.18 x 10⁵ Pa

• 1.18 x 10⁶ Pa

• 2.19 x 10⁵ Pa

• 2.19 x 10⁶ Pa

A swimming pool has the dimensions shown in the drawing.  It is filled with water to a uniform depth of 12.00 m.

 

       The density of water = 1.00 x 10³ kg/m³. 

The Atmospheric Pressure = 101325 Pa

What is the TOTAL pressure exerted on the bottom of the swimming pool?

P_total = P_atm+P_exerted

• 2.19 x 10⁵ Pa

• 1.18 x 10⁵ Pa

• 5.88 x 10⁴ Pa

• 2.5 x 10⁵ Pa