College Physics

Coordinate Systems for One-Dimensional Motion In order to describe the direction of a vector quantity, you must designate a coor ...

example, a lecture may start at 11:00 A.M. and end at 11:50 A.M., so that the elapsed time would be 50 min.Elapsed timeΔtis the ...

Speed In everyday language, most people use the terms “speed” and “velocity” interchangeably. In physics, however, they do not h ...

Figure 2.11Position vs. time, velocity vs. time, and speed vs. time on a trip. Note that the velocity for the return trip is neg ...

(a) The average velocity of the train is zero becausexf=x 0 ; the train ends up at the same place it starts. (b) The average spe ...

Figure 2.13A subway train in Sao Paulo, Brazil, decelerates as it comes into a station. It is accelerating in a direction opposi ...

Example 2.1 Calculating Acceleration: A Racehorse Leaves the Gate A racehorse coming out of the gate accelerates from rest to a ...

is best to consider smaller time intervals and choose an average acceleration for each. For example, we could consider motion ov ...

1. Identify the knowns. In the figure we see thatxf= 6.70 kmandx 0 = 4.70 kmfor part (a), and x′f= 3.75 kmandx′ 0 = 5.25 kmfor p ...

(2.15) a- = ⎛ ⎝ +30 km/h 20.0 s ⎞ ⎠ ⎛ ⎝ 10 3 m 1 km ⎞ ⎠ ⎛ ⎝ 1 h 3600 s ⎞ ⎠= 0.417 m/s 2 Discussion The plus sign means that acce ...

Figure 2.21(a) Position of the train over time. Notice that the train’s position changes slowly at the beginning of the journey, ...

Figure 2.22 Strategy Average velocity is displacement divided by time. It will be negative here, since the train moves to the le ...

velocity, which is positive here. As inExample 2.5, this acceleration can be called a deceleration since it is in the direction ...

Δt = t (2.24) Δx = x−x 0 Δv = v−v 0 ⎫ ⎭ ⎬ wherethe subscript 0 denotes an initial value and the absence of a subscript denotes a ...

Solution 1. Identify the knowns. v- = 4.00 m/s,Δt= 2.00 min, andx 0 = 0 m. Enter the known values into the equation. x=x 0 +v- ...

Figure 2.28 Solution 1. Identify the knowns.Δv= 70.0 m/s,a= −1.50 m/s^2 ,t= 40.0 s. 2. Identify the unknown. In this case, it is ...

Shuttle obtains a greater final velocity, so that it can orbit the earth rather than come directly back down as an ICBM does. Th ...

2. Plug the known values into the equation to solve for the unknownx: (2.41) x=x 0 +v 0 t+^1 2 at 2 . Since the initial position ...

v^2 = 0 + 2⎛ (2.47) ⎝26.0 m/s 2 ⎞ ⎠(402 m). Thus v^2 = 2.09×10^4 m^2 /s^2. (2.48) To getv, we take the square root: (2.49) v= 2. ...

1. Identify the knowns and what we want to solve for. We know thatv 0 = 30.0 m/s;v= 0;a= −7.00 m/s^2 (ais negative because it is ...