Physics Kinematics Level: High School
The takeoff speed of a jetliner is 360 km/h . If the jetliner is to take off from a 2100 m long runaway , what must be the (constant) acceleration along the runway ?
Physics Kinematics Level: High School
The driver of an automobile traveling at 80 km/h suddenly slams on the brakes and stops in 2.8 s . What is the average deceleration during braking ?
Physics Kinematics Level: High School
The speed skating record for women is held by Bonnie Blair , who completed a 500-m race in 39.1 s . What is the corresponding average speed ? Give the answer in m/s and in km/h .
Physics Work,Power & Energy Level: High School
Inelastic Collision
If objects A and B (see the figure at “click here”) collide and remain in constant , determine resultant velocity , Neglect friction .
Physics Force & Laws Of Motion Level: High School
The braking mechanism on an aircraft carrier can bring a 2 top plane to a stop in a time of 1.8 seconds . The plane lands at 80 mph . Determine the force required and the deceleration rate .
Physics Force & Laws Of Motion Level: High School
Conservation of momentum
A 4 kg rifle firing an 8 g bullet at 650 m/s obeys the law of conservation of momentum .Determine the recoil speed of the rifle .
Physics Rotational Mechanics Level: High School
A pulp and paper machine has a roller that has a mass of 400 kg and a mass moment of inertia about its center of rotation of 30 kg.m^2 . How long will it take a torque of 15 N-m to accelerate the machine from 0.8 to 2.3 revolution per second ?
Physics Waves And Oscillations Level: High School
All three springs (see the figure at “click here”) are at their free length just before the 200 lb force applied . Determine the deflection and work done on each spring ?
Physics Waves And Oscillations Level: High School
A spring with a constant of 0.3 lb/in . is presently stretched 1.5 in .How much work is required to stretch it in additional 4 in ?
Physics Work,Power & Energy Level: High School
Using a lever and fulcrum , a worker lifts a weight of 1000 lb a height of 4 in . Determine the work done . What force did this person apply if his end of the lever traveled 3.5 ft ?
Physics Rotational Mechanics Level: High School
An electric motor has a rotor with a mass moment of inertia of 35 ft-lb-sec^2 . What torque is required to accelerate it from rest to 1160 rpm in 1.5 seconds ?
Physics Kinematics Level: High School
Projectile Motion
An enemy vessel is on the east side of a mountainous iceberg . The enemy vessel can maneuver to within 5000 m of the 3600 m high iceberg peak and can shoot missiles with an initial speed of 500 m/s . If the western tip is horizontally 600 m from the peak , what are the distance from the western tip at which a ship can be safe from the attack from the enemy vessel ?
Physics Kinematics Level: High School
Projectile Motion
A B.B of mass m is moving horizontally with speed Vo when it hits and ice cube of mass 10 m that is at rest on horizontal frictionless stool . The surface of the stool is a height h above the floor . After the impact the B.B and the ice cube slide off the stool and hit he floor a distance x from the edge of the stool . Derive expressions for the following quantities in terms of m, h, Vo, and appropriate constants .a) the speed of the block as it leaves the stool
b) the distance x
Suppose that the B.B passes through the ice cube instead of remaining in it .c) State whether the time required for the ice cube to reach the floor from the edge of the stool would now be greater , less , or the same . Justify your answer.
d) State whether the distance x for the ice cube would now be greater , less , or the same . Justify your answer.
Physics Kinematics Level: High School
Projectile Motion
A laser is shot with an initial speed of 75 m/s at a launch angle of 35 degrees from the horizontal towards and energy shield 250 m away . The height of the shield is 40 m . Assume that the effects due to air are negligible .a) How long after the laser is launched does it arrive at the shield ?
b) Does the laser strike the shield ? If it does , how high up does it strike the shield ? If it misses , doe sit fall short or does it pass over the shield ?
c) Assume only the launch angle may be varied , determine what launch angles will allow the laser to just clear the top of the energy shield ?
Physics Kinematics Level: High School
Projectile Motion
Derek Jeter hits a baseball 1 m above the plate, launching the ball off at an angle of 30 degrees . The ball just makes it over the 10 m fence that reads 104 m . Find the initial velocity of the ball .