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3 years ago

X-Rays contradict to? a)beta b) alpha. C) gamma

Physics

2 answers:

Likurg_2 [28]3 years ago

8 0

Answer:

hello hello hello hello hello hello hello hello hello

Vesna [10]3 years ago

3 0

<h3>X-Rays contradict to?</h3>

<h3>C. gamma </h3>

a type of penetrating electromagnetic radiation produced by the radioactive disintegration of atomic nuclei

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A clothes dryer uses about 5 amps of current from a 240 volt line. How much power does it use?

yan [13]

PVI, so the power used would be 240*5= 1200 Watts.

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3 years ago

The ratio of carbon-14 to nitrogen-14 in an artifact is 1:7. Given that the half-

ycow [4]

Answer:

17,190 years old

Explanation:

A p e x

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3 years ago

A soccer ball rolls to a stop of 21 m/s with a deceleration of -2.0 m/s. How far does it roll until it stops?

Luba_88 [7]

Answer:110.25 m

Explanation:v^2 = u^2 + 2as

21^2 = 0 - 2*2*s

s = 441/4

s=110.25 m

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3 years ago

Read 2 more answers

A javelin thrower standing at rest holds the center of the javelin behind her head, then accelerates it through a distance of 70

JulijaS [17]

Answer:

a = 580 m/s^2

Explanation:

Given:

- Distance for accelerated throw s_a = 70 cm

- Angle of throw Q = 30 degrees

- Distance traveled by the javelin in horizontal direction x(f) = 75 m

- Initial height of throw y(0) = 0

- Final height of the javelin y(f) = -2 m

Find:

What was the acceleration of the javelin during the throw? Assume that it has a constant acceleration.

Solution:

- Compute initial components of the velocity:

V_x,i = V*cos(30)

V_y,i = V*sin(30)

- Use second equation of motion in horizontal direction:

x(f) = x(0) + V*cos(30)*t

75 = 0 + V*cos(30)*t

t = 75 /V*cos(30)

- Use equation of motion in vertical direction:

y(f) = y(0) + V_y,i*t + 0.5*g*t^2

Subs the values:

-2 = 0 + V*sin(30)*75/V*cos(30) - 4.905*(75/Vcos(30))^2

-2 = 75*tan(30) - 4.905*(5625/V^2*cos^2(30))

V^2 = 4.905*5625 / (2 + 75*tan(30))*cos^2(30)

V^2 = 812.0633

V = 28.5 m/s

- Use the third equation of motion in the interval of the throw:

V^2 = U^2 + 2*a*s_a

28.5^2 = 2*a*0.7

a = 580 m/s^2

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3 years ago

the pilot of a new stealth helicopter, which has a mass of 15000 kg and was traveling at 180 m/s, accelerated to 250 m/s in 6 s

nirvana33 [79]

Answer:

Force = 175000 newtons

Final momentum = 1050000 N*S

Explanation:

We know that force is equal to Mass * acceleration

We also know that the mass of object is 15,000kg.

We know acceleration is (change in velocity)/time

Our initial velocity is 180m/s

our final velocity is 250 m/s

the time it took was 6 seconds

our change in velocity is 250 - 180 = 70

the time it took was 6 seconds

a = 70/6 = 11.67 m/s^2

So we can calculate force, by doing Mass * Acceleration, which is 15,000 * 11.67

Force is 175000 Newton's

Momentum is calculated by Velocity * mass or Force * time

we could do either one

<u>velocity</u><u> </u><u>*</u><u> </u><u>mass </u>way

we are given final velocity is 250 m/s, and that the initial velocity is 180 m/s. We first have to find the change in velocity by subtracting final and initial and get 70, and then we multiply that by the mass, which is 15000 kg.

we multiply them together and get 1050000 Kg*m/s

<u>Force </u><u>*</u><u> </u><u>time </u>way

We just calculated the force above, and got 175050 newton's. from that we just multiply by the time, which is 6 seconds

and we get a result of

1050000 Newton*seconds

*** remember newton*seconds is the same as kg*m/s

8 0

3 years ago