Answer the following statement(s) true (T) or false (F)
1. When you go over the crest of a hill in a roller coaster, a force appears to lift you up out of your seat. This is a fictitious force
2. If your car is hit from behind, you are suddenly pressed back into the seat. The normal force that the seat exerts on you is a fictitious force.
3. You are pressed downward toward the floor as an elevator begins to move upward. The force pressing you down is a fictitious force.
1. TRUE
2. FALSE
3. TRUE
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In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 5.21 kPa and water is flowing with a speed of 1.50 m/s. The pipe narrows to 2.50 cm. What is the pressure in the narrower region?
A) 4.00 kPa B) 7.50 kPa C) 5.82 kPa D) 6.42 kPa E) 4.61 kPa
A car's speed 3 seconds after accelerating from rest at 2 m/s2 is
A) 2 m/s. B) 3 m/s. C) 4 m/s. D) 6 m/s.
The least massive stars, including our sun, eventually end their lives as
A) neutron stars. B) red giants. C) black holes. D) white dwarfs. E) quasars.
Lillian sees a chair at the Exploratorium that has been scaled up by three. In attempting to lift it, she finds the chair is
A) three times as heavy. B) six times as heavy. C) nine times as heavy. D) more than nine times as heavy.