A snowboarder takes 0.89 hr. to go down the mountain. If his average velocity is 20.1 mk/hr South, what is his displacement?
17.889.
100
Mr. Dellibovi dives 90 ft at an angle of 55 degrees below the horizonral of the ocean. What are the two components?
What is x= 51.6 y=-73.7
100
Which has a net force equal to zero?
A. a leg kicking a soccer ball
B. Someone walking at a constant speed on a level road
C. The moon in orbit around Earth at a constant velocity
D. A dog halting to a stop when it sees a cat
What is B. Someone walking at a constant speed on a level road
100
Which angle would shoot a ball and have it in the air for the longest amount of time?
A. 90 degrees
B. 45 degrees
C. 10 degrees
What is A. 90 degrees
100
Suppose you are whirling an untied yo-yo in a horizontal circle and you double its speed.
A. Its centripital acceleration doubles.
B. Its acceleration vector is constant.
C. None of these answers
D. Its centripital acceleration goes up by a multiplicative factor of 4
What is D. Its centripital acceleration goes up by a multiplicative factor of 4.
200
What does the slope of a velocity vs. time graph represent?
What is acceleration
200
A girl walks two blocks west, two blocks North, and 8 blocks East. What is her resultant displacement? (Blocks and Angle)
What is X= 6.32 Angle= 18.43 degrees
200
Which situation would amke the cup of tea sitting on the dashboard slide towards the rear of your convirtable?
A. Acceleration from rest
B. Driving backwards and stopping suddenly
C.Driving and then accelerating
D. Dancing in the car
E. A, B, and C
What is E. A, B, and C
200
A 5 kg ball and a 20 kg ball fall from the same height at the same time.
1. Which has the greatest acceleration?
2. Which hits the ground first?
3. Which hits the ground with the greatest speed?
What is 1. Same 2. Same 3. Same
200
Sarah spins a round frisbee overhead with a frequency of 30 revolutions per minute. Find the linear speed of a stray fly stuck on the frisbee 6 cm from the frisbee's center.
What is 0.188 m/s
300
Draw a displacement vs time graph and a velocity vs time graph
What is In the D vs T graph,the line is going upwards at a slope and in the V vs T graph, the line is horizontal
300
It is posible that two vectors of magnitude 10 and 4 can be added to produce a 3rd vector of magnitude..
A. 10
B. 3
C. 16
D. 15
What is A. 10
300
You are hanging from a rope off the edge of a cliff. Which forces are acting on you?
What is Tension and Gravity
300
Which combination will give you the greatest X distrance?
A. 90 degrees
B. 45 degrees
C. 30 degrees
What is B. 45 degrees
300
True or False.
For a car moving along a curved racetrack at a constant speed... is its acceleration is perpenticular to its instantanious velocity?
What is True
400
Shayna runs for 5 hours, 20 minutes, and 10 seconds. The distance she ran was 30 km. What is her average speed?
What is 1.56 m/s
400
You have a force vector of 20 N at 35 degrees. Which component is larger?
What is the X component =16.38
400
Name what the equal but opposite force is for a tricycle moving forward?
What is the wheels pushing back on the ground
400
A soccer ball is kicked off of a cliff at a speed of Vi= 15 m/s. The cliff is 50 m high. How long does it take for the stone to fall to the ground?
What is 3.19 seconds
400
What would happen to a centripetal acceleration if the radius was tripled and the velocity was 6 times greater?
What is be 12x greater
500
In a car, list the part(s) that control the speed. Then say what controls the velocity
What is speed: gas pedal velocity: steering wheel
500
A runner runs 50m South, turns 90 degrees West and runs 30m. She then makes another 90 degree turn and moves 10 m. What is the largest possible displacement and shortest of the runner?
What is shortest: 50m
Longest: 67.08m
500
Two blocks are connected by a rope and then hung to the ceilling by another rope attatched to the top block. Each block is 20 kg. What is the tension in each weightless rope?
What is Upper= 392 Lower= 196
500
A basketball is thrown from one player of the Lakers to another. What is the acceleration of the ball at the highest point in its trajectory?
A. 9.8 m/s^2 upward
B. 9.8 m/s^2 downward
C. 0 m/s^2
What is B. 9.8 m/s^2 downward
500
When dealing with circular motion, there really is no centrifugal acceleration or any outward force and is jsut our experience of?