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3 years ago

A car traveling with constant speed travels 150 km in 7200 s. What is the speed of the car?

Physics

1 answer:

VLD [36.1K]3 years ago

8 0

Speed = $\frac{Distance}{Time}$ 150 km = 150 000 m Speed = $\frac{150000}{7200}$ Speed = 20.83 m/s, or 75.0 km/h

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What was Galileo’s contribution to the study of motion?

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3 years ago

You know that you sound better when you sing in the shower. This has to do with the amplification of frequencies that correspond

Lera25 [3.4K]

Answer: Length axis f= 114.3 Hz, Width axis f=228.67 Hz

Explanation:

We are given that,

Length of tub= 1.5 m

Width of tub= 0.75 m

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Now, we are also given shower is closed.

So, frequency is given as:

f= $m* \frac{v}{2L}$

For length axis

Put v= 343 m/s, m=1 and L=1.5 m

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f= 2* $\frac{343}{2*1.5}$

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For width axis

Put v= 343 m/s, m=1 and L= 0.75 m

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4 years ago

The same force is applied to two skateboards. One rolls across the room and the other moves a few feet and comes to a stop. Wher

crimeas [40]

More work was done in the skateboard that came to a stop because the one that rolled across the room moved on a surface with less friction while the second board used more work to move on a surface with much friction.

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3 years ago

Read 2 more answers

A red laser from the physics lab is marked as producing 632.8-nm light. When light from this laser falls on two closely spaced s

BARSIC [14]

Answer:

The wavelength is $\lambda_R = 649 *10^{-9}\ m$

Explanation:

From the question we are told that

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The spacing between the fringe is $y_r = 6.00\ mm = 6.00*10^{-3} \ m$

The spacing between the fringe for smaller laser point is $y_R = 6.19 \ mm = 6.19 *10^{-3} \ m$

Generally the spacing between the fringe is mathematically represented as

$y = \frac{D * \lambda }{d}$

Here $D$ is the distance to the screen

and d is the distance of the slit separation

Now for both laser red light light and small laser point D and d are same for this experiment

$\frac{y_r}{\lambda_r} = \frac{D}{d}$

=> $\frac{y_r}{\lambda_r} = \frac{y_R}{\lambda_R}$

Where $\lambda_R$ is the wavelength produced by the small laser pointer

$\frac{6.0 *10^{-3}}{ 632.8*10^{-9}} = \frac{ 6.15 *10^{-9}}{\lambda_R}$

=> $\lambda_R = 649 *10^{-9}\ m$

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3 years ago

How does stuff fall?

drek231 [11]

Answer:

Gravity is the force that allows for all objects to fall.

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3 years ago