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3 years ago

a dad expends 200 joules of work pushing a stroller up a hill. he produces 125 j of work. how efficient is he being?

Physics

1 answer:

AVprozaik [17]3 years ago

7 0

Not efficient enough

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At a depth of 10.9 km, the Challenger Deep in the Marianas Trench of the Pacific Ocean is the deepest site in any ocean. Yet, in

bearhunter [10]

Answer:

$P = 1.09 \times 10^8 Pa$

Explanation:

As we know that the pressure inside the liquid level is given as

$P = \rho g h + P_o$

here we have

$\rho = 1024 kg/m^3$

h = 10.9 km

also we know that

$P_o = 1.01 \times 10^5 Pa$

now we have

$P = (1.01 \times 10^5) + (1024)(9.81)(10.9 \times 10^3)$

$P = 1.09 \times 10^8 Pa$

8 0

3 years ago

What is the speed of a wave with a period of 25 sec/cycle and a wavelength of 15 m/cycle?please help me !

Nuetrik [128]

The answer of this question is 0.6m/s

5 0

3 years ago

A 420N force act on a 400N object, and the force is from the north.

belka [17]

Answer:

I believe its forward or south :D

Explanation:

7 0

3 years ago

How fast and in what direction must galaxy A be moving 17 an absorption Line found at 500 nm for a stationary galaxy 1s shifted

emmainna [20.7K]

Answer:

v = 0.22 c and wavelength is decrease so galaxy A is move away from stationary galaxy

v = 0.095 c and wavelength is increase so galaxy B come toward stationary galaxy

Explanation:

Given data

found = 500 nm

shifted A = 400 nm

shifted B = 550 nm

to find out

How fast and in what direction is galaxy

solution

we use here formula that is

(λ) shifted = √(1-β / 1+β) (λ)found

1-β / 1+β = (4/5)² ..................1

1-β / 1+β = 16 / 25

β = 0.22

v/c = 0.22

v = 0.22 c

here wavelength is decrease so galaxy A is move away from stationary galaxy

and

here according to equation 1

and we use shifted 550 nm

1-β / 1+β = (5.5/5)²

1-β / 1+β = 30.25 / 25

β = 0.095

so v/c = 0.095

v = 0.095 c

here wavelength is increase so galaxy B come toward stationary galaxy

3 0

3 years ago

If a resistance is added in parallel to a circuit resistance is than?

irakobra [83]

Answer: The total resistance in a parallel circuit is always less than any of the branch resistances. Adding more parallel resistances to the paths causes the total resistance in the circuit to decrease. As you add more and more branches to the circuit the total current will increase because Ohm's Law states that the lower the resistance, the higher the current.

Explanation:

8 0

3 years ago

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