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3 years ago

As a ball falls freely toward the ground, its total

1 answer:

hjlf3 years ago

3 0

As a ball falls freely toward the ground, its total mechanical energy "remains the same" but it should be noted that its potential energy is decreases at this time.

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Assume a change at the source of sound reduces the wavelength of a sound wave in air by a factor of 3.

noname [10]

Explanation:

The speed of a wave is given by :

$v=f\lambda$ ......(1)

(i) Here, the wavelength of a sound wave in air reduces by a factor of 3. Equation (1) becomes :

$\lambda=\dfrac{v}{f}$

Wavelength and frequency are inversely proportional to each other. So, if wavelength of a sound wave in air reduces by a factor of 3, then the frequency will increases by a factor of 3.

(ii) It remains the same.

8 0

3 years ago

Which of the following must ALWAYS be equal to the buoyant force on an object?

professor190 [17]

Answer:

Explanation:

I’m not sure but I hope this helped

8 0

2 years ago

An air conditioner has a power rating of 3000 W and is used daily. Its electrical

Anarel [89]

Answer:

5.714 hours / day

Explanation:

Calculate the hours used in that week

120000 / 3000 = 120 / 3 = 40 hours a week

Calculate the amount it is used in one day

40 / 7 = 5.71428571 hours or 5.714 hours/day

5 0

2 years ago

Read 2 more answers

Friction is a ____________ force a. Artificial b. Natural c. Pessimistic d. Negative

Daniel [21]

Answer:

natural is the answer

5 0

2 years ago

Read 2 more answers

A toaster uses 6700 joules of energy in 45 seconds to toast to a piece of bread what is power of the oven

just olya [345]

P= w/t and W= Work
In this case, W= 6,700j, and T= 45 seconds
Power is the ratio of work per unit time. When you perform a work in a given span of time, the ratio of work performed with respect to time is Called Power.
si unit for Power is Watt (W)
so, P= 6,700/45
P= 148
Final answer is P=148

8 0

3 years ago