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In-s [12.5K]
3 years ago
8

A gymnast falls from a trapeze while doing a stunt. Assuming she is in free fall, how far will she have fallen in 0.3 seconds?

Physics
2 answers:
Nata [24]3 years ago
6 0
∆x=V∆t +1/2a∆t
=(0)(0.3s)+1/2(9.8)(0.3s)
=1.47m
Let domward as positive
Delvig [45]3 years ago
3 0

0.4 m, answer on apex

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Two a.c V1=100sin(wt) and V2 = 150cos(wt) are fed into one circuit, determine the combined output of the two as a single a.c
Dominik [7]

Answer:

Explanation:

V = 100sin(ωt) + 150cos(ωt)

let x = ωt

V = 100sin(x) + 150cos(x)

a maximum or minimum will occur when the derivative is zero

V' = 100cos(x) - 150sin(x)

0 = 100cos(x) - 150sin(x)

100cos(x) = 150sin(x)

100/150 = sin(x)/cos(x)

0.6667 = tan(x)

x = 0.588 rad

V = 100sin(0.588) + 150cos(0.588)

V = 180.27756

as the maximum will not occur until ωt = 0.588 radians, for a cosine function we subtract that amount as a phase angle φ

V = 180.3 cos(ωt - 0.588)

or as a sine function, the phase angle lags the cosine by a difference of π/2

V = 180.3sin(ωt - (0.588 - π/2)

V = 180.3sin(ωt + 0.983)

7 0
3 years ago
PLEASE HELP ME WITH THIS ONE QUESTION
Vinil7 [7]

Answer:

b

Explanation:

7 0
3 years ago
You need to design an experiment to measure the free-fall acceleration. You have an inclined plane made of steel and several obj
Nataliya [291]

Attached a diagram of the scheme described in the problem ..

To solve the problem we need to know the relationship between kinetic and normal force, so

F_k=\mu_k F_N (1)

Where

\mu_k = coefficient of kinetic

F_N=  Normal force

We perform the sum of forces as well,

\sum F_x = Ma(2)

a= Acceletarion

For Normal Force in Y,

F_N= Mgcos \theta  (3)

The force in X,

\sum F_x = Mgsin\theta - F_x (4)

Replacing in (4)

Ma = Mgsin\theta - \mu_k F_N

Ma = Mgsin\theta - \mu_k F_N

Ma = Mgsin\theta - \mu_k Mg cos\theta

a= g(sin\theta-\mu_k cos\theta)

In this way, it does not matter which object is chosen.

6 0
3 years ago
PLEASE HELP !
pochemuha

B

HOPE IT HELPS LET ME KNOW IF U NEED EXPLANATION

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3 years ago
A mechanical wave is created when a medium ____, or moves back and forth or up and down
Zielflug [23.3K]
I think it is traverse wave
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4 years ago
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