Two objects of the same mass move along the same line in opposite directions. The first mass is moving with speed v
The objects collide, stick together, and move with speed 0.100v in the direction of the velocity of the first mass before the collision. What was the speed of the second mass before the collision?
A) 0.900v B) 0.800v C) 1.20v D) 0.00v E) 10.0v
B
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The cabin pressure of a passenger jet cruising at high altitude (30,000 ft) is about 1 atm. and the pressure outside is about 0.3 atm. What is the outward force on a window measuring 1 foot by 1 foot
a. 10.3 lb b. 100.3 lb c. 1,000.3 lb d. 1,481.8 lb e. 2,116.8 lb
A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
A) 30 s B) 15 s C) 45 s D) 4.2 s
Compare the days, seasons, and years of Mars and Earth
What will be an ideal response?
Water can be turned to ice by
A) lowering the surrounding air pressure. B) extracting energy. C) both of these D) neither of these