1. Fx = 20*cos30 = 17.32 N.
2. Work = Fx*d = 0 * 10 = 0
3. a.
4. W = Fx*d = 255*Cos60 * 15 =
5.
1. A man pushes on a box at an angle of 30.0° with a force of 20.0 N and the box moves across the floor. Which of the following component of the force do you use to calculate work?
(Points : 1)
0.00 N
10.0 N
17.3 N
20.0 N
Question 2.2. A man carries a 10 kg sack of groceries in his arms with a force of 50 N as he walks forward a distance of 10 m. How much work has he done?
(Points : 1)
0 J
50 J
100 J
500 J
Question 3.3. In which of the following situations has the energy of the object been increased?
(Points : 1)
A hammer thrower spins around while preparing to release the hammer.
A horse moves horizontally while a circus performer jumps vertically on its back.
A boy pushes a lawn mower forward by pushing at a downward angle on the handle.
A soldier runs forward, while holding a rifle above his head.
Question 4.4. A rope pulls on a metal box at an angle of 60.0° with a force of 255 N. The box moves horizontally for 15.0 m. How much work was done on the box?
(Points : 1)
255 J
1,910 J
3,310 J
3,830 J
Question 5.5. Which of the following is a scalar quantity?
(Points : 1)
parallel component of force
perpendicular component of force
displacement
work
3 answers
1. 17.3 N
2. 0 J
3. A boy pushes a lawn mower forward by pushing at a downward angle on the handle
4. 1,910 J
5. Work
(I just took the test, these are the correct answers)
2. 0 J
3. A boy pushes a lawn mower forward by pushing at a downward angle on the handle
4. 1,910 J
5. Work
(I just took the test, these are the correct answers)
Emily L is correct