Which of the following rocks would be expected to have the coarsest-grained texture?
a) granite
b) obsidian
c) basalt
d) pumice
a
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If the velocity vector of a car in a particular direction is increasing, the acceleration vector of that car in the same direction must also be increasing
Indicate whether the statement is true or false
Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
a. each body exerts an equal and opposite force on the other during the collision. b. the forces act during equal time intervals. c. the law of conservation of momentum for an isolated system is a vector equation. d. of all of the above. e. of only (a) and (b) above.
An airplane is flying at a speed of 200 m/s in level flight at an altitude of 800 m. A package is to be dropped from the airplane to land on a target on the ground
At what horizontal distance away from the target should the package be released so that it lands on the target? A) 2.55 km B) 125 m C) 326 m D) 786 m E) 1.22 km
The planets never travel in a straight line as they orbit the Sun. According to Newton's second law of motion, this must mean that ________
A) the planets are always accelerating B) a force is acting on the planets C) the planets will eventually fall into the Sun D) the planets have angular momentum