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MaRussiya [10]
3 years ago
9

"Which of the following is most like the rotation" of stars in the disk of the Milky Way? cars moving at a constant speed on a c

ircular race track the planets in our solar system a DVD in a player the hands of an analog clock the tire of a car moving
Physics
1 answer:
xxTIMURxx [149]3 years ago
4 0

Answer:

cars moving at a constant speed on a circular race track.

Explanation:

The rotation of stars in the disk of milky way is more like that of cars moving at a constant speed on a circular race track.

That is all stars are rotating at fixed point in a fixed orbit , such that no two stars are crossing each other. Speed of all stars are different from each other but all stars are rotating at a constant speed.

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A car traveled 1425 k from El Paso , Tx to Dallas, Tx in 12.5 hours what was the cars average speed
liraira [26]

114 kmh is the average speed.
= 1425/12.5
6 0
3 years ago
A blue ball is thrown upward with an initial speed of 24.1 m/s, from a height of 0.5 meters above the ground. 2.9 seconds after
Aleks04 [339]

Answer:

1. Speed=0

2. 2.46 s

3.30.1 m

4. 22.0 m

5.1.004 s

Explanation:

We are given that

Initial speed of blue ball, u=24.1 m/s

Height of blue ball from ground y_0=0.5 m

Initial speed of red ball , u'=7.2 m/s

Height of red from ground=y'0=32 m

Gravity, g=9.81ms^{-2}

1.When the ball reaches its maximum height then the speed of the blue ball is zero.

2.v=0

v=u+at

Using the formula and substitute the values

0=24.1-9.81t

Where g is negative because motion of ball is against gravity

24.1=9.81t

t=\frac{24.1}{9.81}=2.46s

3.y=y_0+ut+\frac{1}{2}at^2

Using the formula

y=0.5+24.1(2.46)-\frac{1}{2}(9.81)(2.46)^2

y=30.1 m

4.Time of flight for red ball=3.77-2.9=0.87s

y'=32-7.2(0.87)-\frac{1}{2}(9.81)(0.87)^2

y'=22.0m

Hence, the height of red ball 3.77 s after the blue ball is 22.0 m.

5.According to question

0.5+24.1(t+2.9)-\frac{1}{2}(9.81)(2.9+t)^2=32-7.2t-\frac{1}{2}(9.81)t^2

0.5+24.1t+69.89-4.905(t^2+5.8t+8.41)=32-7.2t-4.905t^2

0.5+24.1t+69.89-4.905t^2-28.449t-41.25105=32-7.2t-4.905t^2

0.5+69.89-41.25105-32=-24.1t+28.449t-7.2t

-2.86105=-2.851t

t=\frac{2.86105}{2.851}=1.004 s

Hence,  1.004 s  after the blue ball is thrown  are the two balls in the air at the same height.

8 0
3 years ago
What are 2 things Lithium, Beryllium, and Boron, have in common?
ivann1987 [24]

Answer:

larger atomic radii because they are on the far left, the s-block, of the periodic table. -The ionic radii increase as you go down groups on the periodic table. -Lithium and Beryllium are not examples of this trend because they are both in 2s.

8 0
3 years ago
The light emitted by an argon laser light includes light with a wavelength of 488 nm. what is the frequency of this light? 6.15
Paraphin [41]
Frequency and wavelength are inversely related. That is, when frequency increases, the value of the wavelength decreases and vice versa. The constant of proportionality of  the relation is the speed of light that has a value of 3.0x10^8 m/s. We calculate as follows:

wavelength = speed of light /frequency
488x10^-9 = 3.8x10^8 / frequency
frequency = 6.15x10^14 /s = 6.15x10^14 Hz ------> OPTION 3
3 0
4 years ago
Which is less likely to be a reliable source of information, the webpage of a university or the webpage of a scientist who is tr
tatyana61 [14]

webpage of a scientist who is trying to sell a new invention

trying to dell = vested interest.

umiversity should be objective impartial

7 0
3 years ago
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