Physics Kinematics Level: High School
Suppose you drop a ball from the top of a five-story building onto the sidewalk 70 ft below . What is the initial velocity of the ball ? Determine a function for the height of the ball t seconds after it’s released and how long will the ball be in the air before it hits the ground ?
Physics Work,Power & Energy Level: High School
a) How much energy is required to stop a 3200 lb car traveling at 60 mi/hr ?
b) If this is accomplished in 10 seconds, how much power is expended ?
Physics Force & Laws Of Motion Level: High School
A 0.25 kg ball moving horizontally at 10 m/s is hit by a bat which reverses the balls direction. Its final velocity is 16 m/s . The bat acts on the ball for 0.015 s. Find the average force exerted on the ball by the bat ?
Physics Work,Power & Energy Level: High School
2 Identical balls with initial velocities V1 = 1.2 m/s and V2 = -.75 m/s collide head on . If the collision is perfectly elastic , what is the final velocity of each ball ?
Physics Kinematics Level: High School
A ball is thrown upwards with an initial speed of 80 ft/sec .a) How high does it go ?
b) What is its speed at the end of 3 sec ?
c) How high is it after 3 sec ?
Physics Force & Laws Of Motion Level: High School
A 70 gram body is projected up a rough incline plane, inclined at an angle of 35 degrees to the horizontal, with an initial velocity of 400 cm/sec . The coefficient of friction between the body and the plane is ½ . How far up the plane will the body go ?
Physics Force & Laws Of Motion Level: High School
A 1200 lb sled is pulled along a horizontal surface at uniform speed by means of a rope that makes an angle of 30 degrees above the horizontal . If the tension, T , in the rope is 100 lbs , what is the coefficient of friction ?
Physics Force & Laws Of Motion Level: High School
A 5 lb weight suspended from a 3 ft cord is pulled to one side by a horizontal force F , so that the cord makes an angle of 30 degrees with the vertical . What is the value of the force F , and what is the value of T , the tension of the cord ?
Physics Kinematics Level: High School
Calculate the height of a cliff if it takes 2.35 s for a rock to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.0 m/s . How long would it take to reach the ground if it is thrown straight down with the same speed .
Physics Kinematics Level: High School
A swimmer bounces straight up from a diving board and falls feet first into a pool . She starts with a velocity of 4.0 m/s and her takeoff point is 1.80m above the pool . What is her velocity when her feet hit the water ?
Physics Kinematics Level: High School
A basketball referee tosses the ball straight up for the starting tip off. At what velocity must a basketball player leave the ground to rise 1.25 m above the floor in an attempt to get the ball ?
Physics Kinematics Level: High School
An express subway train passes through an underground station . It enters with an initial velocity of 22.0 m/s and decelerates at a rate of 0.150 m/s^2 as it goes through . The station is 210m long .a) If the train is 130 m long , when does the end of the train leaves the station ?
b) What is the velocity of the end of the train as it leaves the station ?
Physics Kinematics Level: High School
How much faster is a cars final speed if you double the gravitational acceleration ?
Physics Kinematics Level: High School
If you add 2m/s to a cars starting speed would it increase the final speed by 2m/s ? should it ? explalin ?
Physics Kinematics Level: High School
If you can build a roller coaster to demonstrate acceleration can you build one in which the rider feels a lot of acceleration ? explain ?