Physics Work,Power & Energy Level: High School
A 90 kg cyclist rides up a long hill with a averagegrade of 8% ( gains 8-m of elevation for 100-m of distance ridden .) His average speed during the climb is 8.5 km/hr . When at the summit , the cyclist has gained 529 kJ of potential energy . How high is the hill in meters ?
Physics Gravitation Level: High School
The moon orbits the earth with a speed of 27.3 days at an average distance of 380000 km . The mass of the earth is 6 x 10e24 kg and the force of gravity between the earth and the moon is 2.05 x 10e20 Newton’s . Calculate the mass of the moon in kilograms .
Physics Force & Laws Of Motion Level: High School
A car is traveling at 50.0 km/h on a flat highway ,a) If the coefficient of friction between road and tires on a rainy day is 0.100 , What is the minimum distance in which the car will stop ?
b) What is the stopping distance when the surface is dry and the coefficient of friction is 0.600 ?
Physics Force & Laws Of Motion Level: High School
A dockworker loading crates on a ship finds that a 20 kg crate , initially at rest on a horizontal surface , requires a 75 N horizontal force to set it in motion . However , after the crate in motion , a horizontal force of 60 N is required to keep it moving with a constant speed . Find the coefficients of static and kinetic friction between crate and floor .
Physics Force & Laws Of Motion Level: High School
A 1000 kg car is pulling a 300 kg trailer . Together , the car and trailer have an acceleration of 2.15 m/s squared in the forward direction . Neglecting friction force on the trailer , determinea) The net fore on the car
b) The net force on the trailer
c) The force exerted by the trailer on the car
d) The resultant force exerted by the car on the road
Physics Kinematics Level: High School
A 2000 kg car is slowed down uniformly from 20.0 m/s to 5.00 m/s in 4.00 sa) What average force acted on the car during that time ?
b) How far did the car travel during that time ?
Physics Kinematics Level: High School
A freight train has a mass of 1.5 x 10 to the seventh power kg . If the locomotive can exert a constant pull of 7.5 x 10 to the fifth power N , how long does it take to increase the speed of the train from rest to 80 km/h ?
Physics Force & Laws Of Motion Level: High School
A 6.0 kg object undergoes an acceleration of 2.0 m/s squared .a) What is the magnitude of the resultant force acting on it ?
b) If this same force is applied to a 4.0 kg object , what acceleration is produced ?
Physics Kinematics Level: High School
Projectile motion
A small sphere of mass M = 0.875 kg is launched with an initial speed of v = 15.00 at an angle , with respect to the horizontal , of x = 25.00 degrees . The sphere is launched off a cliff a distance h = 30.00 m above ground level . Finda) The maximum height above the ground attained by the sphere .
b) The speed of the sphere as it strikes the ground
c) The speed of the sphere the “top” of its path .
Physics Waves And Oscillations Level: High School
A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling . The elastic potential energy of this spring / mass system is 1.6 J . What is the elastic potential energy of the system when the 3.2 kg block is replaced by a 4.6 kg block ?
Physics Waves And Oscillations Level: High School
Simple harmonic motion
In preparation for shooting a ball in a pinball machine , a spring ( k = 675 N/m) is compressed by 0.0655 m relative to its unstrained length . The ball (m = 0.0565 kg) is at rest against the spring at point A . When the spring is released . the ball slides (without rolling ) to point B , which is 0.300 m higher than point A . How fast is the ball moving at B ?
Physics Waves And Oscillations Level: High School
Simple harmonic motion
When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion . its frequency is 12 Hz . When another object of mass m2 is hung on the spring along with m1 , the frequency of the motion is 4 Hz . Find the ratio m2/m1 of the masses .
Physics Waves And Oscillations Level: High School
Simple harmonic motion
An 0.60 kg object is attached to one end of a spring , and the system is set into simple harmonic motion .The displacement x of the object as a function of time is shown in the figure at “click here” . With the aid of this data . determine the following values .a) amplitude A of the motion
b) angular frequency omega
c) spring constant k
d) speed of the object at t = 1.0 s
e) magnitude of the object’s acceleration at t = 1.0 s
Physics Force & Laws Of Motion Level: High School
To measure the static friction coefficient between a 2.1 kg block and a vertical wall , the setup shown in the drawing is used . A spring (spring constant = 411 N/m) is attached to the block . Someone pushes on the end of the spring in a direction perpendicular to the wall until the block not slip downward . If the spring in a setup is compressed by 0.072 m , What is the coefficient of static friction ?
Physics Waves And Oscillations Level: High School
When a rubber band in a slingshot is stretched , it obeys Hooke’s law . Suppose that the “spring constant” for the rubber band is k = 22 N/m . When the rubber band is pulled back with a force of 5.0 N , how far does it stretch ?