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Terms in this set (33)
The speed limit on some interstate highways is roughly 100 km/h. 1. What is this in meters per second? 2. How many miles per hour is this?
1.) 27.8 m/s
2.) 62 mi.h
Which of these equations is dimensionally correct?
I. mv/t = F
II. xv^2 = fx^3/x^2
III. xt = vt^2 + at^3
mv/t = F and xt = vt^2 + at^3
What is this expression equivalent to?
24/2.0 + 300
321
Determine the number of significant figures in the following measurements:
1. 0.0009
2. 15,450.0
3. −6×10^3
4. 87.990
5. 30.42
1, 6, 1, 5, 4 respectively
If a marathon runner averages 9.5 mi/h, how long does it take him or her to run a 26.22-mi marathon?
2.8 h
Which of these best approximates the area of a typical movie theater screen?
100 m^2
How many heartbeats are there in a lifetime?
2×10^9 heartbeats
The graph shows the motion of a shark through the water over the course of a day. What is the total distance that the shark travels throughout the day and what is its net displacement?
Total distance is 60 km, and the net displacement is 0 km.
Which of the following is true for the displacement of an object?
It is both the straight line distance the object moved as well as the direction of its motion.
What are the displacement and distance traveled for a police officer who walks 3 blocks north, then 5 blocks south, then 4 blocks north, and finally 8 blocks south?
Displacement is -6 blocks, and distance is 20 blocks.
Zoe saw a flash of lighting, and 4.17seconds later she heard a crack of thunder produced by the lightning strike. Assuming the sound traveled straight toward her at an average speed of 348m/s , how far was Zoe from the point where the lightning struck?
1.45×10^3m
Jason swims 3 laps in the pool in 105s . If each lap is 50m , what was his average swimming speed?
1.4 m/s
Consider the motion of the object whose velocity is charted in the above graph. Between which points is the object slowing down, and between which points is it speeding up?
It is slowing down between "d" and "e" and then after "h". It is speeding up between "a" and "d" and "e" and "h".
What does the area under a velocity vs. time graph line represent?
displacement
how far does he run?
96 m
Consider the velocity vs. time graph shown below of a person in an elevator. Suppose the elevator is initially at rest. It then speeds up for 3seconds , maintains that velocity for 15seconds , then slows down for 5seconds until it stops. Find the instantaneous velocity at t=10s and t=23s .
Instantaneous velocity at t=10s and t=23s are 3m/s and 0m/s .
A car travels with an average velocity of 23 m/s for 82 s. Which of the following could have been the car's displacement?
1900 m west
A school bus travels straight from the school to its first stop at an average speed of 18.5 km/h. What distance does the bus travel if it takes 3.5 min to get to this first stop?
1.1 km
A boy standing on a bridge over a river 30.0 m below drops a stone straight down and finds that it takes 2.0 seconds to hit the water. Assume that the acceleration of the stone is 9.8 m/s2 downwards. Find the initial velocity of the stone.
-5.2 m/s
A commuter backs her car out of her garage with an acceleration of 1.40m/s2 .
How long does it take her to reach a speed of 2.00 m/s?
1.43 s
If she then brakes to a stop in 0.800 s, what is her deceleration?
−2.50m/s2
Why is acceleration a vector quantity?
It is a vector quantity because it has magnitude as well as direction.
A cyclist traveling at 9.0m/s brakes to a stop at a traffic light with an acceleration of −3.00m/s2 . How long does it take the cyclist to come to a complete stop?
3.00 seconds
Consider these vectors. What is B-A?
3 km north
A bird flies 2.0km south and then 1.5km 37∘ east of south. How far will it have to fly to get back to its original place if it flies in a straight line?
3.3 km
True or False: We can use Pythagorean theorem to calculate the length of the resultant vector obtained from the addition of two vectors which are at right angles to each other.
true
A car travels 12.2km at 35∘ west of north and then 11.7km at 70∘ west of north. What is its total displacement?
22.8 km at 52.1 west of north
This coordinate system shows the location of a line from the origin to (4.0,-2.0). What is the angle of this line as measured from the -y-axis?
63 degrees
Consider A→−B→=R→ . What is Ry in terms of Ay and By ?
Ry=Ay−By
Given the vector:
8.544 N at 200.6° above the x axis
calculate the x- and y-components of the given vector.
x = -7.998 N, y = -3.006 N
What is the magnitude of a vector whose x-component is 2units and whose angle is 60 degrees ?
4.0 units
For what angle of a vector is it possible that its magnitude will be equal to its y-component?
θ=90 degrees
What is the x-component of a vector that makes an angle of 45∘ with the positive x-axis and whose y-component is 7cm ?
7.0 cm
Related questions
QUESTION
A freight train rolls along the track with considerable momentum. If it were to roll at the same speed but had twice as much mass, it's momentum would be what?
QUESTION
increasing the potential difference across two plates of a capacitor will produce what effect on the capacitor?
QUESTION
The acceleration of an object moving in a circular path and at a constant speed is due to what
QUESTION
True or False? For a projectile that lands at the same height that it is projected from, the time to rise to the peak is equal to the time to fall from its peak to the original height.
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Verified questions
PHYSICS
Which answer below is closest to the magnitude of the normal force that the idealized in-run exerts on the $60-k g$ skier? (a) $590 \mathrm{N}$ (b) $540 \mathrm{N}$ (c) $250 \mathrm{N}$ (d) $230 \mathrm{N}$
PHYSICS
As a prank, someone has balanced a pumpkin at the highest point of a grain silo. The silo is topped with a hemispherical cap that is frictionless when wet. The line from the center of curvature of the cap to the pumpkin makes an angle $\theta_{i}=0^{\circ}$ with the vertical. While you happen to be standing nearby in the middle of a rainy night, a breath of wind makes the pumpkin start sliding downward from rest. It loses contact with the cap when the line from the center of the hemisphere to the pumpkin makes a certain angle with the vertical. What is this angle?
PHYSICS
If a $$ 42.0 \mathrm { N } \cdot \mathrm { m } $$ torque on a wheel causes angular acceleration $$ 25.0 rad/s^2 $$ , what is the wheel's rotational inertia?
PHYSICS
After you pick up a spare, your bowling ball rolls without slipping back toward the ball rack with a linear speed of 2.8 m/s. (a) If the diameter of the bowling ball is 0.22 m, what is its angular speed? (b) To reach the rack, the ball rolls up a ramp. If the angular speed of the ball when it reaches the top of the ramp is 1.2 rad/s, what is the linear speed of the ball?