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sveticcg [70]
3 years ago
11

A cheetah runs 900 meters in 30 seconds. how fast is it going?

Physics
1 answer:
Serga [27]3 years ago
7 0
900 meters/30 seconds= 30 meters/second


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A car can accelerate from rest to 28 m/s and travels 280meters. How long does this acceleration take?
Reika [66]

Answer:

a=1.4m/s^2

Explanation:

From the question we are told that

Velocity v=28m/s

Distance d=280

Generally the Newtons equation for motion is mathematically given as

Acceleration

v^2=2as

a=\frac{V^2}{2s}

a=\frac{28^2}{2*280}

a=1.4m/s^2

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3 years ago
Determine the x and y components of reaction at pin b on bc using scalar notation.
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i do not know.....................................


3 0
3 years ago
An electron and a proton have the same kinetic energy and are moving at speeds much less than the speed of light. Determine the
morpeh [17]

Answer:

The ratio of the Broglie wavelength of an electron to that of the proton is 42.85.

Explanation:

let λe be the Broglie wavelength of the electron and λp be the Broglie wavelength of the proton, Me be the mass of the electron and Mp be the mass of the proton. let h be the Planck constant, Kep be the kinetic energy of the proton and KEe be the kinetic energy of the electron

4 0
3 years ago
Sara, who weighs 66 kg, is on a guilt trip after eating a 788-Calorie (788 kcal) breakfast of pancakes loaded with fruits, cream
yaroslaw [1]

Answer:

<em>Sara must climb 10609 stairs to burn this food.</em>

<em></em>

Explanation:

Chemical energy content in Sara's body = 788 kCal x 4.184 = 3296.99 kJ = 3296990 J

her body is only 25% effective in converting chemical to mechanical energy, therefore,

available mechanical energy = 25% of 3296990 = 0.25 x 3296990 = <em>824247.5 J --this is equivalent to the work she must do to burn this stored energy</em>

flight of stairs = 12 cm = 0.12 m

Sara's mass m = 66 kg

Sara's weight = mg = mass x acceleration due to gravity 9.81 m/s^2

weight W = 66 x 9.81 = 647.46 N

work done = force x distance climbed d

putting in the necessary values, we have

824247.5 = 647.46 x d

d = 1273.05 m

the number of stairs Sara must climb is equal to the distance climbed divided by the height of a single stairs

number of stairs = 1273.05/0.12 = 10608.75 ≅ <em>10609 stairs</em>

6 0
3 years ago
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