Physics Gravitation Level: High School
Motion of a Satellite in an Orbit
The earth exerts a gravitational force on the moon that is constantly accelerating the moon towards the earth , and yet the moon never hits the earth . Explain why this is so .
Physics Vectors Level: High School
One child pulls on a toy with a force of 50 N eastward . A second pulls on the same toy with a force of 60 N westward . What is the net force on the toy (magnitude and direction ) ?
Physics Force & Laws Of Motion Level: High School
Second Law of Motion
A net force of 14 N gives a cart an acceleration of 2 m/s . What is the mass of the cart
Physics Kinematics Level: High School
One dimensional
A relief package dropped from a hovering helicopter hit the ground 10 seconds after it was dropped . How far did it fall ?
Physics Kinematics Level: High School
One dimensional
The distance from Los Angeles to San Francisco is about 400 miles . If you make the trip in 8 hours , what is your average speed ?
Physics Force & Laws Of Motion Level: High School
First Law of Motion
If an object is at rest , can we conclude that there are no external force acting on it ? Explain .
Physics Vectors Level: High School
Vector A has a magnitude of 25 units and vector B has a magnitude of 15 units . What is the minimum and maximum magnitude of a vector A + B ?
Physics Work,Power & Energy Level: High School
Collision
A 0.410 kg block of wood hangs from the ceiling by a string , and a 0.0700 kg wad of putty is thrown straight upward , striking the bottom of the block with a speed of 6.50 m/s . The wad of putty sticks to the block .a) Is the mechanical energy of this system conserved ?
b) How high does the putty-block system rise above the original position of the block ?
Physics Work,Power & Energy Level: High School
Collision
A 809 kg car stopped at an intersection is rear-ended by a 1540 kg truck moving with a speed of 17.5 m/s . If the car was in neutral and its brakes were off , so that the collision is approximately elastic , find the final speed of both vehicles after the collision .
Physics Work,Power & Energy Level: High School
Collision
A car moving with an initial speed v collides with a second stationary car that is 3/5 as massive . After the collision the first car moves in the same direction as before with a speed v/4 .a) Find the final speed of the second car .
b) Is this collision elastic or inelastic ?
Physics Kinematics Level: High School
Projectile
When a water gun is fired while being horizontally at a height of 1.25 m above the ground , the water travels a horizontal distance of 6.0 m . A child , who is holding the same gun in a horizontal position , is also sliding down a 45 degree incline at a constant speed of 2.8 m/s . If the child fires the gun when it is 2.5 m above the ground and the water takes 0.342 s to reach the ground , how far will the water travel horizontally ?
Physics Kinematics Level: High School
Projectile
A projectile is shot from the edge of a cliff 160 m above ground level with an initial speed of 110 m/s at an angle of 41 degrees with respect to the horizontal . Determinea) The time it takes for the projectile to hit the ground .
b) The range , as measured from the base of the cliff .
Physics Kinematics Level: High School
Projectile
Due to tropical storm in the ocean , a boat gets blown off course . To make things worse , the boat is filling with water . Luckily , the Coast Guard heard the beacon for help . Awaiting arrival of a helicopter , the search plane drops flotation devices . The plane is moving horizontally with a speed of 177 km/hr and is at an altitude of 220 m . How far away from the boat ( in the horizontal direction) should the plane drop the gear to get it on target of the boat ?
Physics Kinematics Level: High School
Projectile
A ship maneuvers to within 2.80 x 10^3 m of an island’s 1.35 x 10^3 m high mountain peak and fires a projectile at an enemy ship 6.65 x 10^2 m on the other side of the peak . If the ship shoots the projectile with an initial velocity of 2.25 x 10^2 m/s at an angle of 68 degrees relative to the water’s surface , how close to the enemy ship does the projectile land ? How close (vertically) does the projectile come to the peak ?
Physics Kinematics Level: High School
One dimensional
The position time equation for an object’s motion is given by the equation x = 2.2t^2+4 .a) Draw an x versus t graph for the object’s motion .
b) Find the objects average velocity from 0-5 seconds .
c) What is the object’s instantaneous velocity at t = 4 seconds .
