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Elva Reinger

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Cards in this guide (12)
A ball is thrown horizontally at 20 ms from the top of a cliff 50 meters high How long does it take the ball to reach the ground

Use the equation [ D = 1/2 g t2 ] .

D = the distance of free-fall = 50 m

g = acceleration of gravity = 9.8 m/sec2

t = time in free-fall

D = 1/2 g t2

2D / g = t2

t = sqrt( 2D / g ) = sqrt( 100 / 9.8 ) = 3.1944 seconds(rounded)

The horizontal velocity that the ball has when it's launched doesn't appear

in the calculation, because it makes absolutely no difference in the result.

Any effects of air resistance have been ignored in arriving at this solution.

A ball is thrown horizontally from a cliff and hits the ground 4 seconds later 40 meters from the base of the cliff how high was the cliff rounded to the nearest tenth of a meter

Ignoring air resistance:

The distance from the base of the cliff is irrelevant as the only force acting on the ball is gravity acting straight down, giving it acceleration due to gravity.

s = ut + 1/2 at^2

For this problem: u = 0 m/s, t = 4 s, a = g (= acceleration due to gravity)

No value is given for g, but as an answer to the nearest tenth is required (1 dp), I'll use a value for g to 2 dp so that I can then round the answer to 1 dp: I'll use g ≈ 9.81 m/s^2

→ s ≈ 0 m + 1/2 x 9.81 m/s^2 x (4 s)^2 = 78.48 m

Rounded to the nearest tenth → 78.5 m.

horizontal distance = speed x time s = vt

45 = 15 t

t = 3 seconds

What type of measurement A northwesterly wind of 5 miles per hour

vector
It is a meteorological measurement.

Two forces act on the same object One force is pushing due east with a force of 6 newtons and the other is pushing due north at 8 newtons What is the resulting force

10 newtons NE. a little more north than east

What is the vertical component influenced by

Gravity

A ball is thrown horizontally from a cliff at a speed of 15 ms and strikes the ground 45 meters from the base of the cliff How high was the cliff rounded to the nearest meter

Answer: 44 meters

A plane is flying north at a speed of 200 miles per hour The wind is blowing at a constant speed of 40 miles per hour from the east What is the resulting speed of the plane calculated to the nearest

204 mph

In what type of orbits do planets move around the sun

elliptical

A football is thrown horizontally off the top of an apartment house that is 78.4 meters high the ball is thrown at a speed of 15 ms how far will the ball travel before hitting the streets below

"60" or "sixty"

What type of measurement is the air pressure inside a tire

SCALAR

A player kicks a soccer ball from ground level and sends it flying at an angle of 30 degrees at a speed of 26 ms

Yes your question is.......................

What term is given to the net figure that results from vector

resultant

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