Physics Force & Laws Of Motion Level: High School
Friction
A drag race crosses the finish line of a 400.0 m track with a final speed of 104 m/s .a) Assuming constant acceleration during the race , find the racer’s time and the minimum coefficient of static friction between the tire and the road .
b) If , because of bad tire or wet pavement , the acceleration were 30.0% smaller , how long would it take to finish the race ?
Physics Force & Laws Of Motion Level: High School
Pulley and Mass
In the figure which is show at “click here” the block of mass m1 slides to the right with coefficient of kinetic friction micro k on a horizontal surface . The block is connected to a hanging block of mass m2 by a light cord that passes over a slight , frictionless pulley .a) Find the acceleration of each o the blocks and tension in the cord
b) Check your answers in the special cases m1< c) For what value of m2(if any) do the two blocks slides at constant velocity ? What is the tension in the cord in that case ?
Physics Misc Topic Level: Misc Level
Pulley and Mass
In the figure which is show at “click here” the block of mass m1 slides to the right with coefficient of kinetic friction micro k on a horizontal surface . The block is connected to a hanging block of mass m2 by a light cord that passes over a slight , frictionless pulley .a) Find the acceleration of each o the blocks and tension in the cord
b) Check your answers in the special cases m1< c) For what value of m2(if any) do the two blocks slides at constant velocity ? What is the tension in the cord in that case ?
Physics Force & Laws Of Motion Level: High School
Friction
A crate of oranges weighing 180 N rests on a flatbed truck 2.0 m from the back of the truck . The coefficient of friction between the crate and the bed are micro s = 0.30 and micro k = 0.20 . The truck drives on a straight level highway at a constant 8.0 m/s .a) What is the force of friction acing on the crate ?
b) IF the truck speed up with an acceleration of 1.0 m/s^2 , What is the force of friction on the crate ?
c) What is the maximum acceleration the truck cabin have without the crate starting to slide ?
Physics Force & Laws Of Motion Level: High School
In the fairly table Rapunzel , the beautiful maiden let her long golden hair hang down from the tower in which she was held prisoner so that her prince could use her hair as a climbing rope to climb the tower and rescue her . Estimate how much force is required to pull a strand of hair out of your head . Next estimate how many hairs might be growing out of Rapunzel’s head . If the prince has a mass of 60 kg , What is the force pulling on each strand of hair ? Will Rapunzel be bald by the time the prince reaches the top of the 30-m tower ?
Physics Force & Laws Of Motion Level: High School
Spring Constant
The forces required to extend a spring to various lengths are measured . The results are shown in the table below . Using the data in the table , plot a graph that helps you to answer the following two questions :a) What is the spring constant ?
b) What is the relaxed length of the spring ?
Force (N) 1.00 2.00 3.00 4.00 5.00
Spring Length 14.5 18.0 21.5 25.00 28.0
Physics Force & Laws Of Motion Level: High School
Newton’s Second Law
A toy freight train consists of an engine and three identical cars . The train is moving to the right at constant speed along a straight , level track . Three spring scales are used to connect the cars as follows : spring scale A is located between the engine and the first car : scale B is between the first and second cars ; Scale C is between the second and third cars .a) If air resistance and friction are negligible , what are the relative reading on the three spring scales A, B and C ?
b) Repeat part (a) , taking air resistance and friction into consideration this time .
c) If air resistance and friction together cause a force of magnitude 5.5 N on each car , directed toward the left , find the readings of scales A , B and C
Physics Gravitation Level: High School
a) If a spacecraft moves in a straight line between the Earth and Sun , at what point would the force of gravity on the spacecraft due to the Sun be as large as that due to the earth ?
b) If the space craft is close to , but not at , this equilibrium point , does the net force on the spacecraft tend to push it toward or away from the equilibrium point ? (Hint : Imagine the spacecraft a small distance d closer to the Earth and find out which gravitational force is stronger)
Physics Measurements Level: High School
For what radius , if any ,does the area of a circle equal the circumference of the circle ? Explain .
Physics Measurements Level: High School
A poster advertising a student election candidate is too large according to the election rules. The candidate is told she must reduce the length and width of the poster by 20% . By what percentage will the area of the poster be reduced ?
Physics Measurements Level: High School
For each of the angle theta = 35 degree , 25 degree , 18 degree , make a table to compare values of Tan (theta) . and Sin (theta) . At which of these angles in degrees does the different between Sin (theta) and Tan (theta) , become approximately :(a) 10% of Sin (theta)
(b) 1% of Sin (theta)
Physics Units Level: High School
Dimensional analysis
Use dimensional analysis to determine how the period T of a pendulum (the elapsed time for a complete cycle of motion) depends on some , or all , of these properties : the length L of the pendulum ,the mass m of the pendulum bob , and the gravitational field strength g (in m/s^2) Assume that the amplitude of the swing (the maximum angle that string makes with the vertical) has no effect on the period .( see the figure at “click here” )
Physics Waves And Oscillations Level: High School
Standing waves
If you have a guitar that is 1 m long and is fixed at both ends, you can pluck it and create a standing wave .Five three possible wavelengths for a standing wave on this string . For each wavelength , state the number of nodes and antinodes the standing wave pattern wave will have . Explain the reasoning , Illustrate .
Physics Waves And Oscillations Level: High School
The figure at “click here” shows a string mass 0.02 kg that’s 25 m long . The wave has a frequency of 3 Hz . Find the amplitude , wavelength , and velocity of the wave and tension on the rope .
Physics Electromagnetic Induction Level: High School
A 20-loop circular coil of wire radius 5 cm is placed in a magnetic field B = 2 T . When the power is turned off ,the field drops uniformly down to B = 0 in 6 seconds . During that time , what is the voltage induced in the coil ?