PHYSICS HIGH SCHOOL

What is the resultant displacement of a dog looking for its bone in the yard, if the dog first heads 55° north of west for 10.0 m, and then turns and heads west for 5.00 m?

Answers

Answer 1

Answer:

Answer:

c = 13.5 m

Explanation:

from the attached diagram, we can apply the cosine rule to get the resultant displacement (c) where

c = $\sqrt{a^(2)+b^(2)-2.a.b.cosθ}$

from the diagram β = 55 degrees because they are alternate angles

θ + β = 180 (sum of angles on a straight line )

θ + 55 = 180

θ = 180 - 55

θ = 125 degrees

c = $\sqrt{a^(2)+b^(2)-2.a.b.cosθ}$

c = $\sqrt{5^(2)+10^(2)-2.5.10.cos125}$

c = $√(25+100-(-57.4))$

c = 13.5 m

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A ball of a mass 0.3 kg is released from rest at a height of 8 m. How fast is it going when it hits the ground? Acceleration due to gravity is g=9.8 m/s^2

Answers

In order to solve this problem, there are two equations that you need to know to solve this problem and pretty much all of kinematics. The first is that d=0.5at^2 (d=vertical distance, a=acceleration due to gravity and t=time). The second is vf-vi=at (vf=final velocity, vi=initial velocity, a=acceleration due to gravity, t=time). So to find the time that the ball traveled, isolate the t-variable from the d=0.5at^2. Isolate the t and the equation now becomes $√((2d)/a)$ . Solving the equation where d=8 and a=9.8 makes the time $√((2*8)/9.8)$ =1.355 seconds. With the second equation, the vi=0 m/s, the vf is unknown, a=9.8 m/s^2 and t=1.355 sec. Substitute all these values into the equation vf-vi=at, this makes it vf-0=9.8(1.355). This means that the vf=13.28 m/s.

Answer:

The answer is 12.5 m/s

v=the square root of 2 x(gh)

or v = the square root of 2 x (9.8 x 8)

Explanation:

A cannon is shot from the ground with a speed of 100 m/s at an unknown angle, if itlands after being in the air for 6 s, what was the angle of the launch?

Answers

Answer:

The angle of the launch is 17.09 degrees.

Explanation:

Given that,

The initial speed of a cannon is 100 m/s

It is launched at some angle and it lands after being in the air for 6 s.

We need to find the angle of the launch.

The time taken by the projectile to reach the ground is called the time of flight. It is given by the formula as follows :

$T=(2u\sin\theta)/(g)$

Here, $\theta$ = launch angle

$\sin\theta=(Tg)/(2u)\n\n\sin\theta=(6* 9.8)/(2* 100)\n\n\theta=\sin^(-1)(0.294)\n\n\theta=17.09^(\circ)$

Hence, the angle of the launch is 17.09 degrees.

A student has a source of radiation that emits one of a, ß or y radiation. She places thesource opposite a Geiger-Müller tube and detector and records the count rate. She then
places a sheet of paper between the source and the detector and records the count rate,
and then repeats this with a sheet of aluminium instead of paper. Describe how her
results will allow her to work out which type of radiation is emitted by the source.

Please help :)

Answers

Answer:

Beta radiation

Explanation:

Radiation differs in its ability to penetrate a material (or air) - alpha particle has the least penetrating power and thus is stopped by the paper. Both beta and gamma particles have higher penetrating power than alpha - they passed through. However, radiation was stopped by a sheet of aluminium, which indicates a beta particles, since gamma radiation particles (photons) can easily pass through aluminium and some solid lead block is required to stop it.

What's a solution that feels slippery

Answers

What are you exactly asking for? A solution that feels slippery? That could mean anything. Please explain a little bit more.

Atoms that have become negatively charged by gaining extra electrons are called _____. anions anodes cations cathodes

Answers

Answer:

Anions

Explanation:

Anions : Anions are defined as the atoms or the radicals. Atoms that have become negatively charged by gaining extra electrons are anions. For example, bromide ion (Br⁻), chloride ion (Cl⁻).

Anodes : The positively charged electrode by which an electron leave a device is called an anode.

Cations : They are the positively charged particle. For example silver ion (Ag⁺).

Cathodes : The negatively charged electrode by which an electron enter an device is called an cathodes.

Hence, the correct option is (a) " anions ".

Anions: negatively charged atoms

Cations: positively charged atoms (CAT-ions are PAWS-itively charged)
Anode: positively charged electrode that allows electrical current flow (positive end of battery)
Cathode: negatively charged electrode that allows electrical current flow (negative end of batter)

How does the scientific process generally begin?

Answers

Answer : To develop a scientific process is a big task. Initially the scientist or the interested researcher may start with the following steps;

a) Start with an Unsolved question;

b) Conduct experiments;

c) Analyse from the observations of the experiments

d) From the conclusions create an theoretical hypothesis;

e) Check for reproducibility of the test results.

f) Write a thesis and submit to a scientific community.

There are several approaches. The most favourable one (in my opinion) is this one:
1. Asking a question
2. Doing a research (how to answer this question)
3. Creating a hypothesis (NOT a thesis!)
4. Experimenting (to prove the hypothesis)
5. Analysing results from the experiment
6. Writing a thesis

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