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3 years ago

8

A ball is thrown horizontally from the roof of a building 7.8 m tall and lands 9.5 m from the base. what was the ball's initial

speed

1 answer:

spin [16.1K]3 years ago

5 0

173 was the initial speed

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A _________ reaction is a type of endothermic reaction that takes place when an ionic compound mixes in water to create an ionic

USPshnik [31]

Chemical reaction is a type of endothermic reaction.

5 0

4 years ago

Read 2 more answers

The National Aeronautics and Space Administration (NASA) studies the physiological effects of large accelerations on astronauts.

m_a_m_a [10]

Answer:

$v = 23.95 m/s$

Explanation:

As we know that when astronaut is revolving in circular path then the acceleration of the astronaut is due to centripetal acceleration

so it is given as

$a_c = \frac{v^2}{R}$

here we know that

$a_c = 4.50 g$

also we know that

$R = 13 m$

now we have

$4.50 \times 9.81 = \frac{v^2}{13}$

$v = 23.95 m/s$

3 0

4 years ago

A boy is pulling a load of 150N with a string inclined at an angle 30 to the horizontal if the tension of string is 105N the for

Lorico [155]

The force tending to lift the load (vertical force) is equal to <u>22.5N.</u>

Why?

Since the boy is pulling a load (150N) with a string inclined at an angle of 30° to the horizontal, the total force will have two components (horizontal and vertical component), but we need to consider the given information about the tension of the string which is equal to 105N.

We can calculate the vertical force using the following formula:

$VerticalForce=Force*Sin(30\° )=(BoysForce-StringForce)*\frac{1}{2}\\\\VerticalForce=(150N-105N)*\frac{1}{2}=VerticalForce=45N*\frac{1}{2}=22.5N$

Hence, we can see that <u>the force tending to lift the load</u> off the ground (vertical force) is equal to <u>22.5N.</u>

Have a nice day!

8 0

4 years ago

helpppp I just saw my crush when I was walking out of a supermarket and like I was looking a mess so now I'm just wondering how

UkoKoshka [18]

Answer:

okay

Explanation:

(wish i could help but im just answering for points)

3 0

3 years ago

calcular la longitud de un péndulo que oscila a 10 Hz en santa fe de bogota, sabiendo que en esta ciudad la aceleracion de la gr

cricket20 [7]

Answer:

$L=2.48*10^{-3} m$

Explanation:

The period equation for a pendulum is given by:

$T=2\pi \sqrt{\frac{L}{g}}$

and we know that T = 1/f, where f is the frequency, so we will have:

$\frac{1}{f}=2\pi \sqrt{\frac{L}{g}}$

Now, we just need to solve this equation for L.

$\frac{1}{2\pi f}=\sqrt{\frac{L}{g}}$

$L=\frac{g}{(2\pi f)^{2}}$

g is the gravity in Bogota (g=9.78 m/s^{2})
f is 10 Hz
L is the lenght of the pendulum

$L=\frac{9.78}{(2\pi*10)^{2}}$

$L=2.48*10^{-3} m$

I hope it helps you!

5 0

3 years ago