4 years ago

Round off the following numbers to three significant digits: 43.659

Physics

1 answer:

laiz [17]4 years ago

5 0

Answer: 43.7

Explanation: Simply round the number so that there are only three digits in the number.

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A cannonball is tired with an initial speed of 40m/s and a launch angle of 30degrees from a cliff that is 25m tall. a. What is t

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Answer:

Part a)

$t = 5.1 s$

Part b)

$x = 176.7 m$

Explanation:

Initial speed of the launch is given as

$v_i = 40 m/s$

angle = 30 degree

Now the two components of the velocity

$v_x = v_i cos30$

$v_x = 34.6 m/s$

similarly we have

$v_y = v_i sin30$

$v_y = 20 m/s$

Part a)

Now to find the time of flight we will have

$\Delta y = v_y t + \frac{1}{2}at^2$

$-25 = 20 t -\frac{1}{2}(9.81)t^2$

$t = 5.1 s$

Part b)

Distance at which the ball will land is given as

$x = v_x t$

$x = 34.6 (5.1)$

$x = 176.7 m$

Part c)

Since x direction there is no acceleration so it will move with uniform speed while in y direction it will accelerate due to gravity

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