Kelly carried a box weighing 10 N the 200 meters from his car to his new house. George took the box from Kelly and carried it up the 3 meter tall flight of stairs. Who did more work?
Answers
W = F * d * cosine (90 degree)
= 10N * 200m * 0
= 0Nm
While lifing 3m tall flight of stairs
W=F*d*cosine(0 degree)
= 10N * 3m
= 300 Nm
George did more work
I think George did more work because George moved the box to the same direction as the force that he applied. So he is applying an upward force to the box to keep it from falling down and moving to the box up the stairs and Kelly does move the box farther than George, but he isn´t doing any work before the force he applies to the box on a different direction than movement.
Hope this helps
Tobey
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b. False
Answers
Answer: True.
Kepler was an astronomer, astrologer and mathematician. He was an apprentice of Tycho Brahe, other big (maybe the biggest) astronomer of their time.
Kepler is best known for his 3 laws of planetary motion.
1) the orbit of a planet is an ellipse with the Sun at one of the two foci
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Answers
Answer:
Acceleration,
Explanation:
It is given that,
Initial speed of Shelly, u = 0
After 6 seconds, she has reached a final velocity of 14 m/s, v = 14 m/s
We need to find the acceleration of Shelly. The formula to find the acceleration is given by :
So, the acceleration of Shelly's is . Hence, this is the required solution.
Answers
Answer:
This is a Upside down Glass of Water Experiment
Explanation:
Explanation:
if I interpret the graphic correctly, then there is a basin fully filled with water on the left, then a piece of paper of a piece of glass, where the paper is in contract with the water on the left, and some water is delivered to the right.
then i suspect this shows the capillary effect of very narrow channels of water. like in the very tiny spaces between the fibers of the paper. as long as the paper is in contact with the water on the left, and the level of water is there higher than on the right, the surface tension of water kind of propels itself further along these narrow channels in the paper and supported by gravity and air pressure it drops even into the other side.
Answers
Answers
mass (m) = 0.120kginitial velocity (Vo) = 0distance traveled (s) = 1.25 m
We first calculate for the final velocity of the ball:
Vf^2 = 2gs + Vo^2
Vf^2 = 2(9.8m/s2)(1.25m)
Vf = 4.95 m/s
Impulse = m(Vf−Vo)
Impulse = 0.120(4.95)
Impulse = 0.59 Ns
To find the momentum of the ball before it hit the floor, we need to figure out its final velocity using kinematics.
Values we know:
acceleration(a) - 9.81m/s^2 [down]
initial velocity(vi) - 0m/s
distance(d) - 1.25m [down]
This equation can be used to find final velocity:
Vf^2 = Vi^2 + 2ad
Vf^2 = (0)^2 + (2)(-9.81)(-1.25)
Vf^2 = 24.525
Vf = 4.95m/s [down]
Now we need to find the velocity the ball leaves the floor at using the same kinematics concept.
What we know:
a = 9.81m/s^2 [down]
d = 0.600m [up]
vf = 0m/s
Vf^2 = Vi^2 + 2ad
0^2 = Vi^2 + 2(-9.81)(0.6)
0 = Vi^2 + -11.772
Vi^2 = 11.772
Vi = 3.43m/s [up]
Now to find impulse given to the ball by the floor we find the change in momentum.
Impulse = Momentum final - momentum initial
Impulse = (0.120)(3.43) - (0.120)(-4.95)
Impulse = 1.01kgm/s [up]
Answers
Answer;
18 Joules
Explanation;
- Work is the measures the transfer of energy when an object moves over a given distance.
- Work is therefore given by; Force × distance
Force =36 Newtons
Distance = 0.5 meters
- Hence; work = 36 N × 0.5 N
= 18 Joules
the answer is 18 joules hope this helps