4. A ball is thrown upward with an initial velocity of 9.8 m/s from of a building. a. Fill in the table below showing the ball's position, velocity, and accel eration at the end of each of the first 4 s of motion.

Time

(s)

1

2

3

Position

(m)

4.9

0

- 17.7

Velocity (m/s)

0

- 9
- 19

b. In which second does the ball reach the top of its flight?

c. In which second does the ball reach the level of the roof, on the way down?

Acceleration (m/s^ 2 )

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

Isobars are lines of constant or equal pressure on a weather map. they can be used to find areas of low or high pressure over a broad area, and they can tell us how intense the system may be. on weather maps, you may have noticed areas that have a large l or h over a region with lines circling around them. the l stands for low pressure and h stands for high pressure. the lines circling them are isobars. check out the pressure system and isobars over georgia and florida. what is the present weather in this area ? a) clear and sunny b) cold and cloudy c) changing weather d) lots of precipitation