You are given the mass of the book with an initial
height of 0.77m. You are also given the final height of the book, 2m above the
floor. The problem requires you to find the work done on the book. It is said
that work is equal to force times distance. And that force is equal to mass
times acceleration due to gravity.
W=Fd
W=mgd=mgh
W=(1.7kg)(9.8m/s^2)(2m-0.77m)
W=20.49J
<span>The work is equal to 20.49J.</span>
Answer:
0.45 m/s in the negative x-direction
Explanation:
From the law of conservation of momentum, the sum of initial momentum equals the sum of final momentum
Momentum, p=mv where m is the mass and v is the velocity
where is the common velocity, and are velocities of magnet moving in positive x-direction and magnet moving in negative x-direction respectively, and are masses of magnet moving in positive x-direction and magnet moving in negative x-direction respectively.
Substituting 125 g for and 85 g for , 7.33 m/s , -11.9 m/s for then
Therefore, the velocity of single unit is 0.45 m/s in the negative x-direction
Since vectors are essentially quantities that have direction, D must be the answer as it contains a direction (down) while the other ones do not.
The material that is the best choice for the head of a hammer is a metal. Having a metal for a hammer head allows you to have a light-weight but heavy duty hammer. Since a hammer is a tool that is used to strike an object repeatedly, a light weight is essential since you would be repeatedly making that motion.
Answer:
3.0m
Explanation:
Because the image distance(v) =object distance(u)
v+u=1.5+1.5=3.0m