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3 0

On the Newtonian theory of gravity, gravitation affects anything with mass. Assuming that none of the answer choices is the only thing that exists in the universe, all of the answer choices are subject to the law of universal gravitation (hence “universal”).

Satellites, water, frogs, and stars all have mass as they are all composed of matter. Thus, all four answer choices should be circled.

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how will resistance change when the voltage increases in an electric circuit if the current remains constant

Yakvenalex [24]

V=IR
Potential Difference (v)= Current (A) * Resistance (Ω)
As V increases, R also increases.

3 0

3 years ago

Sound waves travel through air at a speed of 330 m/s. A whistle blast at a frequency of about 1.0 kHz lasts for 2.0 s. (a) Over

klasskru [66]

Answer:

a) x = 660 m , b) λ = 0.330 m , c) precision is 0.1 cm , d) Δf= n Δt/ t²

Explanation:

a) the speed of sound is constant, therefore we can use the relation of motion to inform the distance that the sound extends is

v = x / t

x = v t

x = 330 2

x = 660 m

b) the speed of sound is

v = λ f

λ = v / f

λ = 330/1000

λ = 0.330 m

c) a measuring tape must be used to measure the wavelength, the precision is 0.1 cm

.d) frequency measurement is more delicate, a stopwatch should be used to measure a certain number of oscillations, and hence calculate the frequency

.f = n / t

Therefore, if we assume that there is no error in the number of oscillations, the pressure is given by the appreciation of the stopwatch, which is maximum 0.01 s

Δf / f = Δt / t

Δf = Δt /t f

Δf= n Δt/ t²

3 0

4 years ago

A skydiver deploys his parachute when he is 1000m directly above his desired landing spot. He then falls through the air at a st

insens350 [35]

We can calculate his resultant speed.

Resultant speed is:
v^2 = 5^2 + 1,9^2
v = 5,349 m/s

Now we need to find angle between resultant speed and vertical speed.
cos(alpha) = 5/5.349 = 0.9347
alpha = 20,8 degrees

Answer is 20,8 degrees

8 0

4 years ago

A weightlifter does 450 J of work on a barbell in 3 s. How much power is the weightlifter generating?

astra-53 [7]

450 J / 3 s = 150 J/s = 150 watts.

8 0

4 years ago

Masses in the universe curve space-time. What does the resulting shape of space-time cause?

swat32

I think the answer is D: gravity

7 0

3 years ago