Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
Consider that the application of a force results in a mass being accelerated , and , that Sir Isaac was far ahead of his time to suggest the way that communication satellites could orbit the Earth , comment succinctly on the result of the force need to loft a payload into Earth orbit , that is , what must that force be sufficient to do to keep the mass of the satellite in orbit ?
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
A nifty grown-up sports car of 2000 pounds zips 500 yards down a straightway in just one second , With how much force did the car accelerate in the inner child of its owner ?
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
A wind-up toy car weighing 0.5 pound zips 20 yards away from a child in just one second . How much force did the toy exhibit when it got away formats young owner ? Kilogram = 2.2 pounds , 1 meter = 3.28 feet .
Physics Electromagnetic Waves Level: High School
A possible means of space flight is to place a perfectly reflecting aluminized sheet into Earth’s orbit and use the light from the Sun to push this solar sail . Suppose a sail of area 6.00 x 10^4 m^2 and mass 6000 kg is placed in orbit facing the sun . The solar intensity of 1380 W/m^2 .a) What force is exerted on the sail ?
b) What is the sail’s acceleration ?
c) How long does it take the sail to reach the Moon , 3.84 x 10^8 m away ? Ignore all gravitational effect and assume that the acceleration calculated in part b remains constant
Physics Alternating Current Level: High School
Oscillator
A 1.00 microF capacitor is charged by a 40 volt power supply . The fully charged capacitor is then discharged through a 10.0 mH inductor .a) Find the frequency of oscillation in this LC circuit .
b) Find the maximum current in the resulting oscillation
c) Assuming perfect capacitors and inductors , how much energy was initially stored in the capacitor ?
d) What is the value of the maximum energy stored in the inductor ?
e) A 50.0 ohm resistor is placed in series with the inductor and capacitor and the capacitor is again charge by the 40 volt power supply . When the capacitor is then discharged through the inductor and resistor , what is the new frequency of the damped oscillation ?
f) What percentage change in frequency did the resistor in part (e) produce ?
Physics Electromagnetic Induction Level: High School
An engineer plans to light a train by utilizing the emf induced in the axles of the train running on the tracks .a) If the downward component of the earth’s magnetic field is 0.6 x 10^-4 T , and the tracks are 1.5 m apart , how large is the emf produced between the tracks by a train traveling at 40 m/s ?
b) Could this voltage be utilized on the moving train ?
c) Could the voltage be utilized at train station at the distant end of the tracks ?
Physics Electromagnetic Induction Level: High School
To monitor the breathing of a hospital patient , a thin belt is girded around the patient’s chest , The belt is a 200-turn coil . When the patient inhales , the area encircled by the coil increases by 39 cm^2 . The magnitude of the Earth’s magnetic field is 50 micro T and makes an angle of 28 degree with the plane of the coil .a) If a patient takes 1.8 s to inhale , find the average induced emf in the coil during this time .
Physics Work,Power & Energy Level: High School
Bungee Jumping
Calculate a bungee cord of unstretched length L0 = 49 m . When the cord is stretched to L>Lo it behaves like s spring and obeys Hooke’s law with the spring constant k = 36 N/m . However , unlike a spring ,the cord folds instead of becoming compressed when the distance between its ends is less than the unstretched length: For L
Physics Work,Power & Energy Level: High School
A block starts at rest and slides down a frictionless track except for a small rough area on a horizontal section on the track (as shown in the figure below ) . It leaves the track horizontally , flies through the air , and subsequently strikes the ground . The acceleration of gravity is 9.81 m/s^2 . At what height h above the ground is the block released ?a) What is the speed of the block when it leaves the track ?
b) What is the total speed of the block when it hits the ground ?
Physics Work,Power & Energy Level: High School
Elastic Potential Energy
The force required to stretch a Hooke’s-law spring varies from O N to 21.1 N as we stretch the spring by moving one end 9.91 cm from its unstressed position . Find the force constant of the spring .a) Find the work done in stretching the spring .
Physics Gravitation Level: High School
Gravitational Potential Energy
A 1.41 ball is attached to a ceiling by a 1.57 m long string . The height of the room is 5.41 m . The acceleration of gravity is 9.8 m/s^2 . What is the gravitational potential energy associated with the ball relative to the ceiling ? Answer in units of J .a) What is the gravitational potential energy relative to the floor ?
b) What is its gravitational potential energy relative to a point at the same elevation as the ball ?
Physics Gravitation Level: High School
Gravitational Potential Energy
Energy is required to move a 422 kg mass from the Earth’s surface to an altitude h = 1.65 RE above the surface . The acceleration of gravity is 9.8 m/s^2 . The earth has the radius RE = 6370000 m . What amount of energy is required to accomplish this move ? (Hint : G and ME can be eliminated in favor of parameter of the gravitational acceleration at the surface of the earth ; ie, g = 9.8 m/s^2 .The product GME may be obtained from R^2E , the gravitational acceleration of the earth’s surface .
Physics Work,Power & Energy Level: High School
Work Energy Theorem
A 0.39 kg particle has a speed of 3.5 m/s at point A and kinetic energy of 6.7 J at point B .a) What is its kinetic energy at A ?
b) What is the particle’s speed at B ? c What is the work done on the particle as it moves from point A to B ?
Physics Gravitation Level: High School
A satellite has a mass of 42 kg and is located at 2130000 m above Earth’s surface . What is the potential energy of the satellite-Earth system ?a) What is the magnitude of the gravitational force exerted by Earth on the satellite ?
Physics Work,Power & Energy Level: High School
Work Energy Theorem
A mechanical pushed a 2416 kg car from rest to a speed of v, doing 3149 J of worked in the process . During this time , the car moves 22 m . Neglecting friction between the car and the road . Find v .a) Find the horizontal force exerted on the car .
