Answer:
Explanation:
Only force in the direction of motion does work
The force acts in the x direction
The x change of position was 6 m
W = Fd = 12(6) = 72 J
Answer:
kinetic frictional force opposes the relative motion between the surfaces in contact of the book and the table.
Explanation:
- When a book slides on across the table and comes to stop then there must be force acting on it which hinder its state of uniform motion.
- According to the Newton's first law of motion every body continues to be in the state of rest or in uniform motion until acted upon by any external force.
- Here while the book slides on the table there acts a force of friction between the table surface and the surface of the book which is in contact to the top of the table while the relative motion between the surfaces there acts a kinetic frictional force which opposes the relative motion between the two.
The rock will sink.
The density of water is 1.0g/cm^3
The density of the rock is 1.73g/cm^3
height of the ball is given as a function of time
it is given by equation
![h = -16t^2 + 96 t](https://tex.z-dn.net/?f=h%20%3D%20-16t%5E2%20%2B%2096%20t)
here in order to find the maximum height we will use the concept of calculus where the maximum value of function will exist when its derivative becomes zero.
so here we can say
![\frac{dh}{dt} = 0](https://tex.z-dn.net/?f=%5Cfrac%7Bdh%7D%7Bdt%7D%20%3D%200)
![-32 t + 96 = 0](https://tex.z-dn.net/?f=-32%20t%20%2B%2096%20%3D%200)
![t = 3 s](https://tex.z-dn.net/?f=t%20%3D%203%20s)
now we will put t = 3 in the given equation
![h = -16*(3)^2 + 96*(3)](https://tex.z-dn.net/?f=h%20%3D%20-16%2A%283%29%5E2%20%2B%2096%2A%283%29)
![h = 144 ft](https://tex.z-dn.net/?f=h%20%3D%20144%20ft)
So the maximum height will be h = 144 ft.
Answer:
Anything in an experiment that remains unchanged.
Explanation:
An example could be the temperature of the laboratory room. If there is something that has an effect on an experiment that is not variable, it is a constant. Another constant could be, say, if you were doing calculations with the same amount and kind of fluid throughout the experiment, then that fluid would also be a constant.