A 900-kg car traveling east at 15.0 m/s suddenly collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together after the collision. What is the speed of the wreckage just after the collision?
A) 6.10 m/s
B) 12.2 m/s
C) 25.0 m/s
D) 35.0 m/s
E) 17.3 m/s
B
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A bowling ball size probe from a spaceship and a pebble size object land on a large asteroid that is far from any star. After a long period of time has passed, it is highly probable that the pebble and the probe
a. have each had the same change in temperature. b. have each had the same change in volume. c. are in thermal equilibrium with one another. d. are not in thermal equilibrium with one another. e. are in thermal equilibrium with one another, but are not at the same temperature.
The Kuiper Belt is at a distance of about 30 AU from the Sun
Indicate whether the statement is true or false
Two kilograms of water at 100°C is converted to steam at 1 atm. Find the change in internal energy (in J). (Lv = 2.26 × 10^6 J/kg.)
a. 2.1 × 10^4 b. 4.5 × 10^6 c. 3.4 × 10^5 d. 4.2 × 10^6 e. 2.1 × 10^6
Projectile Motion: A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground and experiences no appreciable air resistance as it moves.(a) How far from where the child is standing does the ball hit the ground?(b) How long is the ball in flight before it hits the ground?(c) What is the magnitude of the ball's velocity just before it hits the ground?
What will be an ideal response?