3 years ago

When a car’s velocity is negative and its acceleration is negative, what is happening to the car’s motion?

Physics

1 answer:

lilavasa [31]3 years ago

5 0

If the velocity and acceleration are negative it means the car is not moving.

You might be interested in

A 500.0-g chunk of an unknown metal, which has been in boiling water for several minutes, is quickly dropped into an insulating

mixas84 [53]

Answer:

electeicity is caused by the movement of. from one atom to the next

6 0

3 years ago

Gravity keeps earth orbiting the sun. Earth is about 93,205,679 miles from the sun. What does this distance tell you about the m

Tpy6a [65]

The planets near the sun are smaller (and made out of rock or earth )

6 0

4 years ago

Read 2 more answers

You are trying to overhear a juicy conversation, but from your distance of 20.0 m , it sounds like only an average whisper of 30

12345 [234]

Answer:

r₂ = 0.2 m

Explanation:

given,

distance = 20 m

sound of average whisper = 30 dB

distance moved closer = ?

new frequency = 80 dB

using formula

$\beta = 10 log(\dfrac{I_1}{I_0})$

I₀ = 10⁻¹² W/m²

now,

$30 = 10 log(\dfrac{I_1}{10^{-12}})$

$\dfrac{I_1}{10^{-12}}= 10^3$

$I_1= 10^{-8}\ W/m^2$

to hear the whisper sound = 80 dB

$80 = 10 log(\dfrac{I_2}{10^{-12}})$

$\dfrac{I_2}{10^{-12}}= 10^8$

$I_2= 10^{-4}\ W/m^2$

we know intensity of sound is inversely proportional to square of distances

$\dfrac{I_1}{I_2}=\dfrac{r_2^2}{r_1^2}$

$\dfrac{10^{-8}}{10^{-4}}=\dfrac{r_2^2}{20^2}$

$10^{-4}=\dfrac{r_2^2}{20^2}$

r₂ = 0.2 m

6 0

3 years ago

Your friend, who is age 15 and has a resting heart rate of 70, wishes to start a jogging program. What would you suggest as a pr

Alex787 [66]

I think the right answer for this question is : 138 because the boy is just 15 year old but he has resting heart rate of 70

6 0

4 years ago

Read 2 more answers

Which objects can be electrically polarized?

SIZIF [17.4K]

neutral objects is correct

5 0

3 years ago

Read 2 more answers