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MrMuchimi
3 years ago
5

A rocket blasts off and moves straight upward from the launch pad with constant acceleration. after 3.6 s the rocket is at a hei

ght of 70.0 m. (a) what are the magnitude and direction of the rocket's acceleration?
Physics
1 answer:
const2013 [10]3 years ago
6 0
X=.5a(t^2), x=70m, t=3.6s, a=?. a=140/(3.6^2)=10.8m/s^2. 
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Calculate the speed of a bus that travels a distance of 55 miles in 0.75 hours.
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Speed = distance / time = 55 / 0.75 = 73.3 miles per hour.
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4 years ago
A fish swimming in a horizontal plane has velocity i = (4.00 î + 1.00 ĵ) m/s at a point in the ocean where the position relative
Liula [17]

Question is missing. Found on google:

a) What are the components of the acceleration of the fish?  

(b) What is the direction of its acceleration with respect to unit vector î?

(c) If the fish maintains constant acceleration, where is it at t = 30.0 s?

(a) (0.73, -0.47) m/s^2

The initial velocity of the fish is

u=(4.00 i + 1.00 j) m/s

while the final velocity is

v=(15.0 i - 6.00 j) m/s

Initial and final velocity are related by the following suvat equation:

v=u+at

where

a is the acceleration

t is the time

The time in this case is t = 15.0 s, so we can use the previous equation to find the acceleration, separating the components:

v_x = u_x + a_x t\\a_x = \frac{v_x-u_x}{t}=\frac{15.0-4.00}{15.0}=0.73 m/s^2

v_y = u_y + a_y t\\a_y = \frac{v_y-u_y}{t}=\frac{-6.00-1.00}{15.0}=-0.47 m/s^2

(b) -32.8^{\circ}

The direction of the acceleration vector with respect to i can be found by using the formula

\theta = tan^{-1}(\frac{a_y}{a_x})

where

a_x is the horizontal  component of the acceleration

a_y is the vertical component of the acceleration

From part a), we have

a_x = 0.73 m/s^2

a_y = -0.47 m/s^2

Substituting,

\theta = tan^{-1}(\frac{-0.47}{0.73})=-32.8^{\circ}

(c) r=(460.5 i - 185.1 j )m

The initial position of the fish is

r_0 = (12.0 i -3.60 j) m

The generic position r at time t is given by

r= r_0 + ut + \frac{1}{2}at^2

where

u=(4.00 i + 1.00 j) m/s is the initial velocity

a=(0.73 i -0.47 j) m/s^2 is the acceleration

Substituting t = 30.0 s, we find the final position of the fish. Separating each component:

r_x =12.0 + (4.00)(30) + \frac{1}{2}(0.73)(30)^2=460.5 m\\r_y = -3.60 + (1.00)(30) + \frac{1}{2}(-0.47)(30)^2=-185.1 m

So the final position is

r=(460.5 i - 185.1 j )m

4 0
3 years ago
A car travels 1800 m south in 35 s, what is it's velocity?​
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Answer:

its velocity is 51, or 51.42 to be exact it would be: 51.4285714286

8 0
3 years ago
1. True or False: Most things in motion are accelerating, few things in real life move at a constant speed.
lord [1]
1. False
2. Positive
I’m just joking I don’t know the answersss
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3 years ago
List the effect of heat​
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Answer:

- changes state

- increases volume

- raises the temperature

Explanation:

it is important effect of heat on an object

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