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Three pendulums all have the same length and start from the same height. The first pendulum is very light and has a mass of 67 g

vovikov84 [41]

Answer:

All three pendulum will attain same velocity

Explanation:

All three pendulum will attain same velocity irrespective of their mass difference in isolated system (means where air drag are negligible) and at same length

As you know when velocity is calculated we can not take mass into account.

3 0

3 years ago

Approximately how many kelvins are equal to 60°f? a. 333 b. 323 c. 413 d. 289

Afina-wow [57]

D. 289
Take the formula:
K=5/9(Fahrenheit-32)+273
Plug in Fahrenheit
K=5/9 (60-32)+273
From here it is simple math and you can plug it into your calculator getting 288.5555556 and round to 289

3 0

4 years ago

Read 2 more answers

Sir Percival and his horse are standing still on a field of honor when Sir Rodney, atop his steed gallops by with a constant vel

Ludmilka [50]

Answer:

d. none of these

Explanation:

From the given information:

Let assume that Percival catches Sir Rodney's horse in time "t" after covering a certain distance "s"

Then, using the second equation of motion:

$S = ut + \dfrac{1}{2}at^2$

FOR Percival, we have:

$S = (0\times t ) + \dfrac{1}{2} \times 0.6 \ m/s \times t^2 \\ \\ S = 0.3 \ m/s \times t^2 -- -- (1)$

FOR Sir Rodney;

$S = ut + \dfrac{1}{2}at^2$

$S = (3\times t ) + \dfrac{1}{2} \times 0 \times t^2 \\ \\ S =3t--- (2)$

Equating both equations together; we have:

0.3t² = 3t

0.3t² - 3t = 0

0.3t(t - 10) = 0

If Percival's position at rest = 0

Then; t = 10 s.

8 0

3 years ago

You're sitting in the back of a taxi and place your bag on the seat next to you. The taxi enters a traffic circle and travels th

svp [43]

Answer:

(d) III only

Explanation:

We have to observe the motion of the bag with respect to taxi , considering taxi as stationary or inertial frame . Since bag is not moving with respect to taxi , the inertial frame that means , net force on it is zero .So option i and ii are ruled out .

Now how to explain motion of the bag ie why it is stationary ie what are the balancing force acting on it. We know that on a body on circular path , a force called centripetal force is acting on it . So that force must be acting on it . The balancing force is the frictional force which is keeping it stationary with respect to taxi . Hence the third option is correct.

5 0

3 years ago

a spring has a spring of 120 newtons per meter. calculate the elastic potential energy stored in the spring when it is stretched

JulsSmile [24]

We know that force for a linear spring is equal to F=kx. Since energy is the potential to do work, and the spring is assumed to be perfectly elastic. Work can be written as:

W = F (integral sign) dx

Therefore,

W=k(Δx)^2 / 2
W = F Δx / 2
W = 120 (2.0) / 2
W = 120

6 0

3 years ago

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