Snowballs are thrown from a roof of a building 9.00 m above the ground. If snowball A is thrown with a speed of 13.0 ms in a direction 30.0° above the horizontal, (a) how long does it take for the ball to reach the ground; (b) what is its horizontal range; and (c) what is its maximum height? If snowball B is thrown from the roof of the building in a direction 30.0°above the horizontal and lands 15.0 m relative to the base of the building, (d) what is its initial speed? If snowball C on the ground is thrown with a speed determined in (d) and lands on the ground 6.00 m from the initial position, (e) what is the direction of the initial velocity of snowball C? (Air resistance can be ignored.)

In the diagram, A → has magnitude 12 and B → has magnitude 8 . The x and y components of A → – B → are about q3_phys2425_f2024.jpg

There is no SI base unit for “area” because:

A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 ms west, and the total acceleration of the car is 2.5 ms 57° north of west. Which of the following is correct?

Four vectors ( A → ,   B → ,   C → ,   D → ) all have the same magnitude. The angle θ between adjacent vectors is 45 ° as shown. The correct vector equation is: q4_phys2425_f2024.jpg

Which of the following has the same dimensions as 12mv2?Note: a=g=LT2; h=L and v=LT-1.

A runner traveling with a speed 6.00 ms is trailing the leader running with a speed 9.00 ms in a Marathon race by 3.00×102 m with a flat, straight 1.00×103 m distance between the leader and the finish line. If the leader is able to increase her speed with an acceleration 0.00500 ms2, (a) how much time does it take for the leader to reach the finish line, and (b) what is the minimum acceleration for the trailed runner to catch up with the leader, assuming a constant acceleration? If the trailed runner increases her speed with an acceleration 0.00500 ms2 when she is trailing 3.00×102 m with a flat, straight 1.00×103 m distance between the leader and the finish line, (c) how much time does it take the trailed runner to reach the finish line, and (d) what is the maximum deceleration of the leader in order for her to maintaining the leading position? If the leader is exhausted and decreases her speed with a deceleration 0.00500 ms2 when she is 1.00×103 m from the finish line, (e) what is the distance from the finish line when the trailed runner catch up with the leader if the trailed runner runs with the acceleration determined in (b)?

A train travels due east at 39.0 ms (relative to the ground) in a rain. Considering that the raindrops of speed 25.0 ms relative to the ground are blown toward the west by the wind and the path of each raindrop makes an 30.0° angle with the vertical, as measured by an observer stationary on the ground, (a) what are the magnitude and direction of the raindrops relative to the observer on the train? Sometime later, the train continues to travel due east at 39.0 ms but the rain is blown toward the east by the wind and the path of each raindrop makes an angle of 40.0° with the vertical, as measured by an observer stationary on the ground. (b) If an observer on the train sees the drops fall perfectly vertically, what is the speed of the raindrops relative to the ground? (c) If an observer on the train sees the drop fall making an angle of 15.0° with the vertical due east, what is the speed of the raindrops relative to the ground?

A river has a steady speed of 0.30 ms. A student swims downstream a distance of 1200 m and returns to the starting point. If the students swims with respect to the water at a constant speed and the downstream portion of the swim requires 20. minutes, how much time is required for the entire swim?

Capacitors C1 and C2 are connected in parallel and a potential difference is applied to the combination. If the capacitor that is equivalent to the combination has the same potential difference, then the charge on the equivalent capacitor is the same as: