Ingrid kicks a football with an initial velocity at 12 m/s at an angle of 45 relative to the ground

1 answer:

5 0

Equation of movement is

y(x) = x * tg (a) - $\frac{g}{2 * u^{2} * cos (a)^{2} } * x^{2}$

where y is y-coordinate, x - x coordinate, u - your initial speed, a = angle above horizon.

differentiate it to get dy/dx (speed)

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Help this was due yesterday...

insens350 [35]

Answer:

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3 years ago

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Mary takes 6.0 seconds to run up a flight of stairs that is 102 meters long. If Mary's weight is 87 newtons, what power has Mary

fredd [130]

Answer: 1479watts

Explanation:

Power is defined as the energy expended or work done in a specific time.

Mathematically,

Power = Workdone/time taken

Since work done is force × distance

Power = force × distance/time

Force = Mary's weight = 87N

Distance = height of the flight = 102meters

Time = 6.0seconds

Substituting in the formula we have;

Power = 87 × 102/6

Power = 1,479watts

Note that the time must be in seconds before usage. If its given in minutes, you will have to convert to seconds

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3 years ago

What kind of medium does ocean waves have

Anika [276]

Ocean waves propagate through the medium called 'sea water'.

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3 years ago

A 7950-kg railroad car travels alone on a level frictionless track with a constant speed of 15.0 m/s . A 2950-kg load, initially

Alchen [17]

The new speed of car is 10.9 m/s

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According to the principle of momentum conservation, momentum is only modified by the action of forces as they are outlined by Newton's equations of motion; momentum is never created nor destroyed inside a problem domain.

Mass of the railroad car, m₁ = 7950 kg

Mass of the load, m₂ = 2950 kg

It can be assumed as the speed of the car, u₁ = 15 m/s

Initially, it is at rest, u₂ = 0

Let v is the speed of the car. It can be calculated using the conservation of momentum as :

$m_1u_1 + m_2u_2 = (m_1 + m_2) v$