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A body travels 30m in 5s, 45m in 7s and then 65m in the last 5s. Find the average speed of the body

JulijaS [17]

We can find the average speed of the body by finding the total distance covered, and then dividing it by the total time of the motion.

The total distance covered is:
$S=30 m + 45m+65m=140 m$

while the total time of the motion is
$t=5 s+7s+5 s=17 s$

So, the average speed of the body is:
$v= \frac{S}{t}= \frac{140 m}{17 s}=8.24 m/s$

8 0

3 years ago

A 7.59-m-tall container is filled to the brim, partway with mercury and the rest of the way with water. The container is open to

hoa [83]

Answer:

0.22 m

Explanation:

$P_{o}$ = Atmospheric pressure = 101325 Pa

$P$ = Pressure at the bottom = tex]2 P_{o}[/tex] = 2 (101325) = 202650 Pa

$h$ = height of the container = 7.59 m

$x$ = depth of the mercury

Pressure at the bottom = Atmospheric pressure + Pressure due to mercury + Pressure due to water

$P = P_{o} + \rho _{w} g (h - x) + \rho _{hg} g x\\2 P_{o} = P_{o} + \rho _{w} g (h - x) + \rho _{hg} g x\\P_{o} = \rho _{w} g (h - x) + \rho _{hg} g x\\101325 = (1000) (9.8) (7.59 - x) + (13600) (9.8) x\\x = 0.22 m$

5 0

3 years ago

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A forest is an ecosystem. There are many plants and animals in the forest. What is true about the plants and animals? The plants

Volgvan

Answer:

The plants depend on animals and animals depend on plants.

Plants depend on animals for nutrients, pollination and seed dispersal. Animals are totally dependent on plants. First of all plants produce oxygen which is vital for life on earth. Then, for many animals plants are their basic food, or if plants don’t make up 100 % of their diet, plants are nevertheless essential in their food supply.

7 0

3 years ago

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A large truck and a small car have a head-on collision. Which scenario is true?

solmaris [256]

B. is the answer dude

7 0

3 years ago

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Calculate the cenrtripetal acceleration of the Earth in

miv72 [106K]

Answer:

$0.00594\ m/s^2\ \text{towards the Sun}$

$3.54737\times 10^{22}\ N$

Explanation:

r = Distance between Earth and Sun = $1.5\times 10^{11}\ m$

Time taken to complete one rotation around Sun is given by

$T=365.25\times 24\times 3600$

Centripetal acceleration is given by

$a=\dfrac{v^2}{r}\\\Rightarrow \\\Rightarrow a=\dfrac{(\dfrac{2\pi r}{T})^2}{r}\\\Rightarrow a=\dfrac{4\pi^2r}{T^2}\\\Rightarrow a=\dfrac{4\pi^2\times 1.5\times 10^{11}}{(365.25\times 24\times 3600)^2}\\\Rightarrow a=0.00594\ m/s^2\ \text{towards the Sun}$

The centripetal acceleration of the Earth in its orbit is $0.00594\ m/s^2\ \text{towards the Sun}$

Force is given by

$F=ma\\\Rightarrow F=5.972\times 10^{24}\times 0.00594\\\Rightarrow F=3.54737\times 10^{22}\ N$

The force on the Earth is $3.54737\times 10^{22}\ N$

4 0

3 years ago