Is work done if you carry a book across the room at a constant velocity?a. No, the force applied is parallel to the direction of motion.
b. Yes, the force applied is parallel to the direction of motion.
c. No, the force applied is perpendicular to the direction of motion.
d. Yes, the force applied is perpendicular to the direction of motion.
Answers
Answer:
No, the force applied is perpendicular to the direction of motion.
Explanation:
Work done is given by :
F = force
d = displacement
= angle between force and displacement
Work is positive when the force and the displacement are in same direction. Work is negative when the force and the displacement are in opposite direction. When the force and displacement are perpendicular to each other, no work is done.
If we carry a book across the room at a constant velocity, the work done is zero. This is because our weight is acting vertically downward and we are moving forward. The angle between the force and the displacement is 90. So, no work is done.
Hence, the correct option is (c) "No, the force applied is perpendicular to the direction of motion".
at a constant velocity?
The force applied is perpendicular to the direction of motion. (C)
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(b Can this plane land on a runaway that is only 0.800 km long?
shown work pls will reward alot of points
Answers
Answer:
a) t = 20 s, b) x = 1000 m, As the runway is only 800 m long, the plane cannot land at this distance
Explanation:
This is a kinematics exercise
a) in minimum time to stop,
v = vo + at
v = 0
t = -v0 / a
we calculate
t = -100 / (5.00)
t = 20 s
b) Let's find the length you need to stop
v² = vo² + 2 a x
x = -v0 ^ 2 / 2a
x = - 100² / 2 (-5.00)
x = 1000 m
As the runway is only 800 m long, the plane cannot land at this distance.
Answers
The frequency is 30,000 per second.
That's the same thing as 30 KHz.
B. Do people look better when they have a suntan?
C. What is the most enjoyable time to be in the sun?
D. Should children be allowed to lie in the sun?
Answers
Out of the options the one that can be tested is: A) Does being in the sun make your skin dry?
As it can be seen that the results of the other options in the question can vary from person to person. As some might find suntan attractive and some might not. Similarly, some might enjoy the morning time sun whereas some might enjoy the sun in the evening. And in the last option, it is hard to conclude whether children might lie in the sun or not as it merely depends on the individual's resistance power to the sunlight.
Therefore, the correct option is(A).
Learn more about the effects of sunlight on:brainly.com/question/1673834
A. Does being in the sun make your skin dry?
You can test this by putting people in the Sun and seeing hop much dryer their skin is than when they're not in the Sun.
Answers
Answer:
direction and speed
Explanation:
because
Answers
Answer: Valid.
Explanation: Since it provides consistent results, it is a good measure to bas a hypothesis or conclusion on.
thermosphere
troposphere
thermosphere
Answers
Answer:
troposphere
Explanation: