PHYSICS MIDDLE SCHOOL

Figure 1.18 (Chapter 1) shows the Hoover Dam Bridge overthe Colorado River at a height of 271 m. If a heavy object is
dropped from the bridge, how much time passes before the
object makes a splash?

Answers

Answer 1

Answer:

Answer: 7.436 s

Explanation:

This situation is related to vertical motion, specifically free fall and can be modelled by the following equation:

$y=y_(o)+V_(o) t+(gt^(2))/(2)$

Where:

$y= 0m$ is the final height of the object (when it makes splash)

$y_(o)=271 m$ is the initial height of the object

$V_(o)=0 m/s$ is the initial velocity of the object (it was dropped)

$g=-9.8m/s^(2)$ is the acceleration due gravity (directed downwards)

$t$ is the time since the objecct is dropped until it makes splash

$0=y_(o)+0+(gt^(2))/(2)$

Clearing $t$ :

$t=\sqrt{(-2y_(o))/(g)}$

$t=\sqrt{(-2(271 m))/(-9.8m/s^(2))}$

Finally:

$t=7.436 s$

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Please answer 72, thank you

1. Initial velocity 5m/s, finalvelocity 36km/hr,
acceleration 1.25m/s/s.
Distance?

Answers

Answer:

31.25m

Explanation:

Check attachment

Answer:

1.25ml

Explanation:

multioply

Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. The blue car accelerates uniformly at a rate of 5.8 m/s2 for 3.3 seconds. It then continues at a constant speed for 9.8 seconds, before applying the brakes such that the car’s speed decreases uniformly coming to rest 255.79 meters from where it started. The yellow car accelerates uniformly for the entire distance, finally catching the blue car just as the blue car comes to a stop.3)How far does the blue car travel before its brakes are applied to slow down?

Answers

Well, the car gets to 5.8*3.3=19.14 m/s, getting to 5.8*3.3*3.3=63.162 meters from the start. For 9.8 secons it goes 187.572 meters, a total of 250.734. So, in 5.056 meters, it stopped uniformly. The speed dropped from 19.14 to 0 in 5.056 meters. There was a formula which didn't use time, but I've forgotten it. It would have given us the deceleration and then one could find the time through a 2nd degree equation. The timing for the first two parts is already known.
Either way, we've calculate more than we need to know for this question. You can cut the answer from that 250.734 distance.

Answer:

raheh

Explanation:

zdrhdrh

21 POINTS HELP !! For each of the following formulae, infer the kind of and number of atoms.a. Nitrogen N2
b. Phosphorus P4
c. Glucose C6H12O6
d. Sulphur dioxide SO2
e. Ethanol C2H5OH

Answers

A) atomic number 7
B) 15
C) 6 c, 12 h, 6 o
D) o-8
S-16

Ladybug walks 10 cm forward and 5 cm backwards in 20 seconds what is the average speed of ladybug what is the average velocity

Answers

Answer:

Average speed = 0.0075 m/s

Average velocity = 0.0025 m/s along forward direction

Explanation:

Speed is the ratio of distance and time and velocity is the ratio of displacement and time.

Distance traveled = 10 + 5 = 15 cm = 0.15 m

Displacement = 10 - 5 = 5 cm = 0.05 m

Time = 20 seconds

$\texttt{Average speed = }\frac{\texttt{Distance}}{\texttt{Time}}\n\n\texttt{Average speed = }(0.15)/(20)=7.5* 10^(-3)m/s\n\n\texttt{Average velocity = }\frac{\texttt{Displacement}}{\texttt{Time}}\n\n\texttt{Average velocity = }(0.05)/(20)=2.5* 10^(-3)m/s$

Average speed = 0.0075 m/s

Average velocity = 0.0025 m/s along forward direction

Hey!

---------------------------------------------------

Formula: Distance / Time = Speed

---------------------------------------------------

Solution:

Speed = 15/20 = 0.75cm/sec

Velocity = 5/20 = 0.25cm/sec

10 + 5 = 15 (distance traveled)

---------------------------------------------------

Answer:

Speed = 0.75cm/sec

Velocity = 0.25cm/sec going forward.

---------------------------------------------------

Hope This Helped! Good Luck!

What are some 5th grade science words that start with y

Answers

yttrium, Y-Chromosome, Yield, Yield Strength, Yotta, yacto are some science words that starts with y.

What is scientific method ?

The scientific method is an empirical approach to learning that has characterized the growth of science at least from the 17th century (with famous practitioners in earlier ages; for more information, see the article history of scientific method. Since one's interpretation of the observation may be distorted by cognitive presumptions, it requires thorough observation and the application of severe scepticism regarding what is observed. It entails developing hypotheses through induction based on these observations, assessing the validity of those hypotheses through experimental and measurement-based statistical testing of the inferences made from them, and then fine-tuning (or discarding) those hypotheses in light of the experimental results. These are the guiding principles of the scientific process, as opposed to a predetermined set of procedures that apply to all scientific endeavors.

To know more about scientific method :

brainly.com/question/16172865

#SPJ3.

yeast
&
yolk
are couple of words i able to think

Match the different health insurance policies with the correct match