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3 years ago

I need help on these 3 questions plz 20 points

Physics

1 answer:

Dmitry_Shevchenko [17]3 years ago

4 0

Answer: the first one is speed

the second one is acceleration

the last is velocity

Explanation:

i got you

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NEED HELP ASAP!!!!!!!!!!!!!

love history [14]

Answer: Decreased risk of heart attack

Explanation:

thats the answer because it actually

increase rish of heart attack

Hope this helps :)

5 0

3 years ago

Read 2 more answers

A branch falls from a tree How fast is the branch moving after 0 28 seconds

egoroff_w [7]

Answer:

c. 2.7 m/s

Explanation:

$v = a.t + v_{0}\\a = g = 9.81 m/s^{2}} \\t=0.28 s \\v_{0} = 0\\=> v = 9.81 * 0.28 = 2.74 m/s$

3 0

3 years ago

A 25 newton force applied on an object moves it 50 meters. The angle between the force and displacement is 40.0 degrees. What is

zvonat [6]

Work done is when a force is exerted to cause a displacement in a certain object.
the equation for work done ;
work done = force applied * displacement of the object
when the force applied is not in the same direction as that of the displacement of the object then the effect of the force is not its whole value. The force is then applied at an angle to that of the displacement of the object, then the resultant force is the force exerted* cos of the angle between force and displacement, in this instance the angle is 40 °.
the new equation is then;
work done = force cos 40° * displacement
after substitution,
work = 25 N * 0.76 * 50 m
= 957.55 J
round it off
= 9.6 *10² J
the correct answer is B

5 0

3 years ago

Read 2 more answers

Please help me .finish this paper

Evgesh-ka [11]

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$\boxed{\sf \dfrac{10\times 1000}{60\times 60}}$

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$\boxed{\sf Sodium\:and\:Potassium}$

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$\boxed{\sf 320m}$

Solution:-4

$\boxed{\sf Rough\:tiles\:are\:used\:in\:bathroom}$

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$\boxed{\sf Mg_3N_2}$

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$\boxed{\sf Grapes\:and\:Rambutan}$

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$\boxed{\sf {}^{}_{}N}$

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$\boxed{\sf Galactuse}$

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$\boxed{\sf Y-X}$

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$\boxed{\sf Cell\:wall}$

7 0

3 years ago

What is the wavelength associated with an electron with a velocity of 4.8X10s m/s? (Mass of the electron is 9.1X10-31kg)?

amid [387]

Answer:

1.52 nm

Explanation:

Using the De Broglie wavelength equation,

λ = h/p where λ = wavelength associated with electron, h = Planck's constant = 6.63 × 10⁻³⁴ Js and p = momentum of electron = mv where m = mass of electron = 9.1 × 10⁻³¹ kg and v = velocity of electron = 4.8 × 10⁵ m/s

So, λ = h/p

λ = h/mv

substituting the values of the variables into the equation, we have

λ = h/mv

λ = 6.63 × 10⁻³⁴ Js/(9.1 × 10⁻³¹ kg × 4.8 × 10⁵ m/s)

λ = 6.63 × 10⁻³⁴ Js/(43.68 × 10⁻²⁶ kgm/s)

λ = 0.1518 × 10⁻⁸ m

λ = 1.518 × 10⁻⁹ m

λ = 1.518 nm

λ ≅ 1.52 nm

4 0

3 years ago