Chem/Phys Chapeter 11
if a train going 60 m/s hits the brakes, and it takes the train one minute 25 seconds of sub, what is it's acceleration?
-.7 m/s^2
A car traveling at 15 m/s starts to decelerate steadily. It comes to a complete stop in 10 seconds. What is its acceleration?
-2 m/s^2
A roller coaster is moving at 25 m/s at the bottom of the hill. Three seconds later it reaches the top of the hill moving at 10 m/s. What was the acceleration of the roller coaster?
-5 m/s^2
how long will it take a car to go from a complete stop to 44 climbers per hour if they are exhilarating at 5 km/h^2?
-9 hrs
A person jogs 4.0 KM in 32 minutes, then 2.0 KM in 22 minutes, and finally 1.0 KM in 16 minutes. What is the joggers average speed in KM per minute?
.1 km/min
A train travels 120 KM in two hours and 30 minutes. What is its average speed?
.80 km/min
➡️5+⬅️-5= what is the distance and displacement of the problem. Displacement is the first number and distance is the second number.
0. 10
➡️5+➡️5= what is the distance and displacement of the problem. Displacement is the first number and distance is the second number.
10. 10
➡️5+⬅️-15= what is the distance and displacement of the problem. Displacement is the first number and distance is the second number.
10. 20
➡️5+➡️10= what is the distance and displacement of the problem. Displacement is the first number and distance is the second number.
15. 15
how long will it take a car to accelerate from 15.2 m/s to 23.5 m/s if the car has an average acceleration of 3.2 m/s^2?
2.5 seconds
A planes average be between two cities is 600 km/h. If the trip takes 2.5 hours how far does the plane fly?
200 km
a child rolls a ball 6 m across a room. the ball hits the wall and rolls halfway back toward the child. what is the balls displacement
3 m
a distance-time graph indicates and object moves 20 km in 4hr. what is the average speed
5 km/hr
➡️5+⬅️-10= what is the distance and displacement of the problem. Displacement is the first number and distance is the second number.
5. 15
⬆️10+⬇️-5= what is the distance and displacement of the problem. Displacement is the first number and distance is the second number.
5. 15
in the previous problem what was George's velocity in meters per second?
500 m/s
if you ride your bike at an average speed of 4 km/hr and need to travel a total distance of 28 km, how long will it take you to reach your destination
7 hours
A roller coaster is velocity at the top of a hill is 10 m/s. Two seconds later it reaches the bottom of the hill with the velocity of 26 m/s. What was the acceleration of the roller coaster?
8 m/s^2
Pete is driving down 7th Street. He drives 150 m and 18 seconds. Assuming he does not speed up or slow down, what is his speed in meters per second?
8.3 m/s
A train moves from rest to a speed of 25 m/s and 30.0 seconds. What is it acceleration?
8.3 m/s^2
George walks to a friends house. He walks 750 m north, then realizes he walked too far. He turns around and walks 150 m south. The entire walk takes him 13 seconds. What is his feet per second?
80 m/s
A boy throws a ball straight up into the air. It reaches the highest point of its flight after four seconds. How fast was the ball going when it left the boys hand?
9.8 seconds
A child drops a ball from a window. The ball strikes the ground and 3.0 seconds. What is the velocity of the ball the instant before it hits the ground?
9.8 seconds
a constant slope on a distance-time graph indicates
a constant speed
what is accelerations formula?
a=V(i)-V(f)/T(i)-T(f)
a moving object does not what if its velocity remains constant or if it returns to the original position
change
what is the difference between speed and velocity
direction
the direction and length of a straight line from the starting point to the ending point of an objects motion is
displacement
what is the significance of the slope in a distance-time graphh
it gives you the meters per second
speed is measured in units if
m/s
the motion of an object looks different to observers in different
points of referance
the sum of two or more vectors is called a
resultant vector
what is speeds formula
s=d/t
a cars speedometer measures
speed
the velocity of an object moving in a straight line changes at the same rate when the object is experiencing constant
speed
if there is a plane in the sky and a person flying a kit what is the frame or reference
the person
what information does displacement give in addition to distance
the shortest distance between 2 point s
because what is always changing, an object moving in a circular path experiences a continuous change in velocity
time
displacement and velocity are examples of what because they have both magnitude and direction
vectors
v=d/t is the equation that defines
velocity
what are two types of speed that can be used to describe the motion of any object in motion
velocity and acceleration