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Natalka [10]
3 years ago
13

In which of the following situations has work been done? Select one: a. A weightlifter holds a 50kg barbell over his head for 3

minutes. b. A yoga instructor holds a handstand for 1 minute. c. A man pulls against a stationary fire truck for 5 minutes. d. A child pushes a 2kg toy 10m across the floor.
Physics
1 answer:
Arlecino [84]3 years ago
5 0
Work done = Force * distance --- In other words, for work to be done, a force should be applied such that there is motion.

Therefore, the only situation meeting the criteria is situation d. where a force is applied resulting to motion.
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A cotton garment cannot keep us warm in winter as a woolen sweater can. Give <br> reason.
seropon [69]

Answer:

Cotton clothes are thin and do not have space in which air can be trapped. Thus, cotton clothes do not prevent heat coming out of our body. Woollen clothes keep us warm during winter because wool is a poor conductor of heat and it has air trapped in between the fibres.

Explanation:

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2 years ago
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How can magnetic properties of a magnet be destroyed​
uranmaximum [27]

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heat, I think

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3 years ago
A basketball is tossed upwards with a speed of 5.0 m/s. ​We can ignore air resistance.
FinnZ [79.3K]

We have that  the maximum height reached by the basketball from its release point is

S=1.3m

From the question we are told

  • A basketball is tossed upwards with a speed of 5.0 m/s. ​We can ignore air resistance.  
  • What is the maximum height reached by the basketball from its release point?

Generally the Newtons equation for Motion  is mathematically given as

V^2=u^2+2as\\\\Therefore\\\\0=25-19.6*S\\\\S=\frac{25}{19.6}\\\\S=1.276

S=1.3m

Therefore

The maximum height reached by the basketball from its release point is

S=1.3m

For more information on this visit

brainly.com/question/23366835

4 0
2 years ago
What is the angular displacement of the wheel between t = 5 s and t = 15 s?
Mkey [24]

The question seems incomplete. The complete text is:

a)What is the angular displacement of the wheel between t = 5 s and t = 15 s

b)What is the angular velocity of the wheel at 15 s

And it refers to the attached figure.

a) 25 rad

The graph shown represent the angular position of the wheel at different times.

Therefore, we can simply calculate the  angular displacement between two times by calculating the difference between the angular position at t2 and the angular position at t1.

At t_1 = 5 s, the angular position from the graph is \theta_1 = 100 rad

At t_2 = 15 s, the angular position from the graph is \theta_2 = 125 rad

Therefore, the angular displacement is

\Delta \theta= \theta_2 - \theta_1 = 125-100 = 25 rad

2) -5.0 rad/s

For a angular displacement vs time graph, the angular velocity at any time is simply equal to the slope of the curve at that time.

Here  we want to calculate the angular velocity at t = 15 s, so we have to calculate the slope at that time.

By noting that the slope is constant in the last part of the motion, we find that the slope between 10 s and 20 s is:

\frac{\Delta \theta}{\Delta t}=\frac{100 rad - 150 rad}{20 s - 10 s}=-5.0 rad/s

This slope is constant between 10 s and 20 s, so the angular velocity of the wheel at t = 15 s

\omega = -5.0 rad/s

5 0
2 years ago
Which of the following is not sublimable? *
galina1969 [7]

Answer:

where is your option ?

you can't write option so I think

sodium chloride is not sublimable

7 0
3 years ago
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