Physics Kinematics Level: High School
A 75.0 kg person stands on a scale in an elevator . What does the scale read (in N and in kg) when the elevator is(a) at rest
(b) ascending at a constant speed of 3.0 m/s.
(c) falling at 3.0 m//s
(d) accelerating upward at 3.0 m/s squared .
(e) accelerating downward at 3.0 m/s squared.
Physics Kinematics Level: High School
Police investigator examining the scene of an accident involving two cars , measure 72 m long skid marks of one of the cars . Which nearly came to a stop before colliding . The coefficient of kinetic friction between rubber and the pavement is about 0.80 . Estimate the initial speed of that car assuming level road .
Physics Kinematics Level: High School
A projectile is launched from ground level to the top of a cliff which is 195 m away and 155 m high . If the projectile lands on top of the cliff 7.6 s after it is fired , find the initial velocity of the projectile (magnitude and direction) Neglect air resistance .
Physics Kinematics Level: High School
On mountainous downhill roads, escape routes are sometimes placed to the side of the road for trucks whose brakes must fall . Assuming a constant upward slope of 32 degrees . calculate the horizontal and vertical components of the acceleration of a truck that slowed from 120 km/h to rest in 6.0 s.
Physics Kinematics Level: High School
A boat whose speed in still water is 1.70 m/s . must cross a 260 m wide and arrive at a point 110 m upstream from where it starts from . To do so, the pilot must head the boat at a 45 degree upstream angle . What is the speed of the river’s current ?
Physics Kinematics Level: High School
How fast does a 1500 kg car have to travel to have the same momentum as a 4000 kg truck moving at 60 km/hr ?
Physics Kinematics Level: High School
Projectile motion
An arrow is shot into the air at an angle of 61.4 degree above the horizontal with a speed of 21.8 m/s .a. What are the x and y components of the velocity of the arrow 3.3 s after it leaves the bowstring ?
b. What are the x and y components of the displacement of the arrow during the 3.3 s interval ?
Physics Kinematics Level: High School
Projectile motion
A ball is thrown from a point 1.2 m above the ground . The initial velocity is 18.8 m/s at an angle of 31.0 degree above the horizontal .a. Find the maximum height of the ball above the ground .
b. Calculate the speed of the ball at the highest point in the trajectory .
Physics Kinematics Level: High School
A stone is launched straight up by a slingshot . Its initial speed is 18.6 m/s and the stone is 1.30 m above the ground when launched . Assuming g = 9.80 m/s^2.a. How high above the ground does the stone rise ?
b. How much time elapses before the stone hits the ground ?
Physics Kinematics Level: High School
A 63 kg lead ball is dropped from the leaning tower of Pisa . The tower is 57 m high .a. How far does the ball fall in the first 2.0 seconds of flight ?
b. What is the speed of the ball after it has traveled 1.6 m downward ?
c. What is the speed of the ball 1.9 s after it is released ?
Physics Kinematics Level: High School
Two blocks are connected by a lightweight , flexible cord that passes over a frictionless pulley . If m1 is 3.4 kg and m2 is 9.1 kg , and the block 2 is initially at rest 140 cm above the floor , how long does it take block 2 to reach the floor ?
Physics Kinematics Level: High School
An airplane lands and starts down the runway at a southwest velocity of 45 m/s . What constant acceleration allows it to come to a stop in 1.4 km ?
Physics Kinematics Level: High School
A 1 kg wood block is pressed against a vetical wood wall by 12 N of force 30^ above the horizontal . If the block is intially at rest , will it move upward or stay at rest ? ( Coefficient of static friction on wood is 0.5 )
Physics Kinematics Level: High School
An archer standing on a 15^ slope arrow 20^ above the horizontal . How far down the sope does the arrow hit if it is shot with a speed of 50 m/s from 1.75 m above ground ?
Physics Kinematics Level: High School
A 4-kg mass and a 10-kg mass are acted on by the same constant net force during the same amount of time . Both masses are at rest before the force is applied . The 10-kg mass moves a distance X1 and the 4-kg mass moves a distance X2 as a result . Which of the following statement are true ?X1 is equal to X2
The ratio X1 /X2 is equal to 5/2
The ratio X1/X2 is equal to (2/5) 2
The ratio X1/X2 is equal to 2/5
