HomeAstronomyBoring feedGame LevelsLight Bulb LifeMap ArchivePhysics 2010ScreencapsSpeed TestTrek DataVote 2020WallpaperWeather
The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 1 | A right triangle has sides 5.0 m, 12 m, and 13 m. The smallest angle of this triangle is nearest: | 23° | |
| 1 | When NASA was communicating with astronauts on the moon, the time from sending on the Earth to receiving on the moon was 1.28 s. Find the distance from Earth to the moon. (The speed of radio waves is 3.00*10^8 m/s.) | 384000 km | |
| 1 | Assume everyone in the United States consumes one soft drink in an aluminum can every two days. If there are 270 million Americans, how many tons of aluminum need to be recycled each year if each can weighs 1/16 pound and one ton = 2000 pounds? | 1.5 million tons | |
| 2 | A rock, released at rest from the top of a tower, hits the ground after 1.5 s. What is the speed of the rock as it hits the ground? (g = 9.8 m/s^2 and air resistance is negligible) | 15 m/s | |
| 2 | A ball is thrown vertically upwards at 19.6 m/s. For its complete trip (up and back down to the starting position), its average velocity is: | not given. | |
| 2 | An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object? | 0 (no sign) | |
| 2 | Omar throws a rock down with speed 12 m/s from the top of a tower. The rock hits the ground after 2.0 s. What is the height of the tower? (air resistance is negligible) | 44 m | |
| 2 | A rock is thrown straight up with an initial velocity of 24.5 m/s. What maximum height will the rock reach before starting to fall downward? (Take acceleration due to gravity as 9.80 m/s^2.) | 30.6 m | |
| 2 | If the displacement of an object is given in SI units by Dx = -3t + 4t^2, at t = 2 s its velocity and acceleration are, respectively: | positive, positive. | |
| 2 | In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties? | It can be positive, negative, or zero. | |
| 2 | A rock is thrown straight down with an initial velocity of 14.5 m/s from a cliff. What is the rock's displacement after 2.0 s? (Acceleration due to gravity is 9.80 m/s^2.) | 49m | |
| 2 | A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 6.0 s. What was the height from which the ball was dropped? (g = 9.8 m/s^2 and assume air resistance is negligible) | 1.8*10^2 m | |
| 2 | Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies? | Both objects hit the ground together. | |
| 2 | In the case of constant acceleration, the average velocity equals the instantaneous velocity: | half-way through the time interval. | |
| 2 | The value of an object's acceleration may be characterized in equivalent words by which of the following? | rate of change of velocity |