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2 years ago

Light travels at a speed of 186,000 miles a second. The distance light travels in a year is:

Physics

2 answers:

Tanzania [10]2 years ago

7 0

Answer:

5,865,696,000,000

Explanation:

31,536,000 seconds in a year. 31,536,000×186,000=5,865,696,000,000

DiKsa [7]2 years ago

3 0

5,865,696,000,000 miles/year
That is the answer!

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A 5.0 kg block is placed on a 30 degree friction-less incline on the surface of earth. What will be the acceleration of the bloc

pshichka [43]

The net force on the block parallel to the incline is

∑ F = -mg sin(θ) = ma

where m is the mass of the block, g = 9.8 m/s² is the acceleration due to gravity, θ is the angle the incline makes with the horizontal, and a is the acceleration of the block. Solving for a gives

a = -g sin(θ)

so the block would slide down the incline with acceleration

a = - (9.8 m/s²) sin(30°) = -4.9 m/s²

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1 year ago

A helium atom has a mass of mHe= 4.002604 u. When disassembled into its constituent subatomic particles (2 protons, 2 neutrons,

Paraphin [41]

Answer:

28.295244 MeV

Explanation:

$m_p$ = Mass of proton = 1.007276 u

$m_n$ = Mass of neutron = 1.008665 u

$m_e$ = Mass of electron = 0.000549 u

Mass of reactant is 4.002604 u

Mass of the products is

$2\times (m_p+m_n+m_e)=2\times (1.007276+1.008665+0.000549)=4.03298\ u$

(2 because there are 2 of each)

The difference in mass is

$4.03298-4.002604=0.030376\ u$

So, the work done in MeV would be

$0.030376\times 931.5=28.295244\ MeV$

The work done required to completely disassemble all the helium is 28.295244 MeV

8 0

2 years ago

4. Choose the velocity quantity from the following.

Tresset [83]

Answer:

a.8m/s is my ans it may help you

3 0

2 years ago

E mirror. w WWW + 9 の 10 V

gladu [14]

Answer:

Explanation:

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5 0

2 years ago

Read 2 more answers

If the lily pads are spaced 2.4 m apart and Ferdinand jumps with a speed of 5 m/s taking 0.6 s to go from lily pad to lily pad,

Zina [86]

Answer:

$36.87^{\circ}$

Explanation:

v = Velocity of Ferdinand = 5 m/s

$\theta$ = Angle of jump

T = Time taken = 0.6 s

R = Distance between lily pads = 2.4 m

Horizontal range is given by

$R=v_xT\\\Rightarrow R=vcos\theta T\\\Rightarrow cos\theta=\dfrac{R}{vT}\\\Rightarrow \theta=cos^{-1}\dfrac{R}{vT}\\\Rightarrow \theta=cos^{-1}\dfrac{2.4}{5\times 0.6}\\\Rightarrow \theta=36.87^{\circ}$

The angle at which Ferdinand make each of his jumps is $36.87^{\circ}$

8 0

2 years ago