Ask question

Ask question

All categories

3 years ago

12

PLEASE HELP!! DUE IN 40 MINUTES!!

1 answer:

Irina18 [472]3 years ago

6 0

A frame of reference can be thought of as the state of motion of the observer of some event. For example, if you're sitting on a lawn chair watching a train travel past you ... you could even watch a glass of water sitting on a table inside the train move ... This seems like a simple and obvious example, yet when you take a step

You might be interested in

A rectangular dam is 101 ft long and 54 ft high. If the water is 35 ft deep, find the force of the water on the dam (the density

blsea [12.9K]

To solve this problem we will begin by finding the pressure through density and average depth. Later we will find the Force, by means of the relation of the pressure and the area.

$P = \rho h$

Here,

h = Depth average

$\rho$ = Density

Moreover,

$\text{Density of water}= \rho = 62.4lb/ft^3$

Replacing,

$P = (62.4lb/ft^3)(\frac{35}{2}ft)$

$P = 1092 lb/ft^2$

Finally the force

$\text{Force} = \text{Pressure}\times \text{Area of dam with water acting on it}$

$F = 1092lb/ft^2(101ft*52ft)$

$F = 5.735*10^6lbf$

6 0

2 years ago

The force measured to move a sled was 10 N and the sled was moved 10 meters,

sergey [27]

Answer:

work done would be I don't know

3 0

2 years ago

Why does buying locally grown fruits and vegetables decrease your carbon footprint?

Jlenok [28]

C. less fuel used to deliver

7 0

3 years ago

Read 2 more answers

1. Which has more momentum: a bowling ball with a velocity of 7.0 m/s or a basketball with a

Andrews [41]

Answer:

kenitec energy

Explanation:

because kinetic and mass have same

3 0

3 years ago

Sonar is used to determine the speed of an object. A 38.0-kHz signal is sent out, and a 40.0-kHz signal is returned. If the spee

ANEK [815]

Answer:

The velocity is $v = 8.743 \ m/s$

Explanation:

From the question we are told that

The frequency of the signal sent out is $f_s = 38.0 \ kHz = 38.0 *10^{3} \ Hz$

The frequency of the signal received is $f_r = 40.0 \ kHz = 40.0 *10^{3} \ Hz$

The speed of sound is $v_s = 341 \ m/s$

Generally the frequency of the sound received is mathematically represented as

$f_r = f_s [\frac{v_s + v}{v_s - v} ]$

where v is the velocity of the object

=> $40 *10^{3} = 38 *10^{3} * [\frac{341 + v}{341 - v} ]$

=> $1.05263 = \frac{341+v }{341-v}$

=> $358.94 - 1.05263v = 341 + v$

=> $17.947 = 2.05263 v$

=> $v = 8.743 \ m/s$

7 0

3 years ago