Physics Kinematics Level: High School
One dimensional
An elevator is moving downward but has a constant upward acceleration of 3.5 m/s2 . At a moment when the elevator speed is V EL = 2.35 m/s downwards , a person , standing in the elevator , releases a coin from a height of h = 1.25 m above the elevator floor .a) sketch position vs. time graph for the coin and elevator
b) how long does it take for the coin to strike the elevator floor
Physics Kinematics Level: High School
One dimensional
A soft tennis ball is dropped into a hard concrete floor from a height of 1.500 m and rebounds to height of 1.100 ma) sketch a position v.s . time graph for this process .
b) calculate ball velocity just before it hits the ground .
c) calculate ball velocity just after it leaves the floor on its way up .
d) what is the balls average acceleration during the collision with the floor , if they are in contact for 3.5 x 10(-3) seconds
Physics Misc Topic Level: Misc Level
A 25 kg chair initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion . Once the chair is in motion, a 327 N horizontal force keeps it moving at a constant velocity .a) Find the coefficient of static friction between the floor and the chair .
b) Find the coefficient of kinetic friction between the floor and the chair .
Physics Force & Laws Of Motion Level: High School
A 25 kg chair initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion . Once the chair is in motion, a 327 N horizontal force keeps it moving at a constant velocity .a) Find the coefficient of static friction between the floor and the chair .
b) Find the coefficient of kinetic friction between the floor and the chair .
Physics Kinematics Level: High School
Projectile
A boy throws a base ball with a speed of 40 m/s at an angle of 25 degrees with the horizontal . Calculatea) The maximum height reached by the ball
b) The total time is in the air (the ground is perfectly level all the way)
c) The range of the baseball
Physics Kinematics Level: High School
Circular motion
A car is moving around a circular path of radius 200 m at a constant speed of 8 m/sa) What is the car’s displacement from the instant it is at position of r1 = 200 m at 90 degrees to the instant it is at a position of r2 = 200 at 0 degrees ?
b) What is the car’s change in velocity between positions r1 and r2 ?
c) What is the car’s average acceleration between r1 and r2 ?
d) What is the cars centripetal acceleration (direction and magnitude) at position r2 ?
Physics Kinematics Level: High School
Projectile
A ball is projected horizontally from the edge of table that is 1.0 m high and it strikes the floor at a point 1.2 m from the base of the table .a) What is the initial speed of the ball ?
b) How high is the ball above the floor when its velocity vector makes a 45 degree angle below the horizontal ?
Physics Kinematics Level: High School
Projectile
A stone is projected at a cliff of height h with an initial speed of 38.0 m/s directed 60.0 degrees above the horizontal . The stone strikes at A, 5.10 s after launching .a) Find the height h , of the cliff .
b) Find the speed of the stone just before impact at A .
c) Find the maximum height H reached above the ground .
Physics Kinematics Level: High School
Projectile motion
A dart is thrown horizontally with an initial speed of 13 m/s toward point P , the bull’s eye on a dart board . It hit at point Q on the rim , vertically below P , 0.16 s later . Neglect air resistance .a) What is the distance PQ ?
b) How far away from the dart board is the dart released ?
Physics Kinematics Level: High School
Projectile motion
A ball rolls horizontally off the edge of a tabletop that is 1.10 m high . It strikes the floor at a point 1.63 m horizontally away from the table edge . (Neglect air resistance )a) How long was the ball in the air ?
b) What was its speed at the instant it left the table ?
Physics Kinematics Level: High School
Projectile
A projectile is fired horizontally from a gun that is 67.0 m above flat ground , emerging from the gun with a speed of 250 m/s .a) How long does the projectile remain in the air ?
b) At what horizontal distance from the firing point does it strike the ground ?
c) What is the magnitude of the vertical component of its velocity as it strikes the ground ?
Physics Kinematics Level: High School
Two dimensional
A particle leaves the origin with an initial velocity v = (5.00 i) m/s and a constant acceleration a = (-3.00 i -0.900 j) m/s2a) What is the velocity of the particle when it reaches its maximum x ?
b) What is the position vector of the particle at this time ?
Physics Kinematics Level: High School
Two dimensional
The velocity v of a particle moving in the xy plane is given by v = (6.0t- 4.0t2) + i + 9.0 J, with v in meters per second and t(>0) is in seconds .a) What is the acceleration when t = 3.0 s ?
b) When is the acceleration zero ?
c) When is the velocity zero ?
d) When does the speed equal 10 m/s ?
Physics Kinematics Level: High School
Two dimensional
The position r of a particle moving in an xy plane is given by r = (3.00t3 – 5.00t) i + (6.00 – 1.00 t4) j . Here r is in meters and t is in seconds .a) Calculate r for t = 1.30 s .
b) Calculate v for t = 1.30 s .
c) Calculate a for t = 1.30 s .
d) What is the orientation of a line that is tangent to the particle’s path at t = 1.30 s ?
Physics Kinematics Level: High School
Two dimensional
A plane flies 480 km east from city A to city B in 45.0 min and then 920 km south from city B to city C in 1.50 h . (Assume i points east and points north )a) In magnitude-edge notation, what is the plane’s displacement for the total trip ?
b) In magnitude-angle notation , what is the plane’s average velocity for the total trip ?
c) What is the plane’s average speed of the trip ?