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3 years ago

14

Help would be greatly appreciated:) thank you! a pendulum clock is brought to mars. How does the bob move on Mars as compared to

on earth? a. it runs slower b. it keeps time just as on earth c. the effect depends on the amplitude of the swing d. it runs faster

1 answer:

Alborosie3 years ago

8 0

It runs slower <span>as gravity is lower so acceleration due to gravity is smaller</span>

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at a 200 meter swimming competition bill got a personal record of 45 secomda and time was 5 secomds faster then bill at the comp

steposvetlana [31]

Answer:

Average speed of the swimmer is 4.44 m/s

Explanation:

As we know that the speed is the ratio of distance covered over time interval

so here we can say

$v = \frac{d}{t}$

so we know that

$d = 200 m$

time taken to complete the trip is

$t = 45 s$

now we have

$v = \frac{200}{45}$

$v = 4.44 m/s$

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4 years ago

Your tired 10 lb. baby cousin is cradled in your arms as you're walking back and forth across a 15m room to get her to fall asle

Mashcka [7]

Work done = Force x Distance

Force = 10 lb = 44.5 N

Work Done = 44.5 N x 15 m

= 667.5 N-m

6 0

3 years ago

Can someone help me

Rainbow [258]

I would have to say hockey it's like soccer... but with ice

8 0

4 years ago

2. Grace drives her car 40 km in 75 minutes. What is her average speed in<br> kilometers per hour?

Agata [3.3K]

Answer:

k

Explanation:

k

3 0

3 years ago

G Railroad tracks are made from segments L = 79 m long at T = 20° C. When the tracks are laid, the engineers leave gaps of width

Andreyy89

Answer:

$l=L\alpha(T_c-T)$

Explanation:

L = Initial length of segment = 79 m

T = Normal temperature = $20^{\circ}\text{C}$

l = Width to be left for expansion

$\alpha$ = Coefficient of linear expansion of the material = $12\times 10^{-6}^{\circ}\text{C}^{-1}$

$T_c$ = Maximum temperature = $39.5^{\circ}\text{C}$

$\Delta T$ = Change in temperature = $T_c-T$

The expression of linear expansion is given by

$l=L\alpha\DeltaT\\\Rightarrow l=L\alpha(T_c-T)$

The expression for the minimum gap distance l the engineers must leave for a track rated at temperature $T_c$ is $l=L\alpha(T_c-T)$

8 0

3 years ago