Answer:
A.
Explanation:
Never swim alone just in case something happens
Answer:
the answer is partner
Explanation:
this is common sense. if you are drowning or need help your partner will either be able to help you, or get help this is why u should NEVER swim alone no matter where or who you are. May i be marked brainliest?
07. 1
Explain why the light refracts as it passes from air into glass. GCSE PHYSICS HIGHER
Answer:
Light is faster in air than in glass so the speed of light decreases when it passes through glass.
WORTH 15 POINTS WILL GIVE BRAINLIEST
What is the mechanical advantage of a handle on a water well that requires 5 newtons of force to lift a 40-Newton bucket of water?
200
8
0.125
12.5%
Option B. The mechanical advantage of a handle on a water well that requires 5 newtons of force to lift a 40-Newton bucket of water is 8.
Mechanical advantage is a measure of the force amplification completed by means of the usage of a device, mechanical tool or gadget device. The device trades off input forces towards motion to gain a preferred amplification in the output pressure.
The version for this is the regulation of the lever. The mechanical advantage is the degree how which tons of force is increased with the aid of using a device or gadget. it is equal to the pressure exerted with the aid of the tool or system divided via the carried-out effort.
calculation:-
Mechanical advantage = load/effort
= 40/5
= 8
Learn more about Mechanical advantage here:-https://brainly.com/question/18345299
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A lens with f=15.0 cm is held 29.0 cm from an object. Where does the image form
Answer:
Magnification, m = 3
Explanation:
It is given that,
Focal length of the lens, f = 15 cm
Object distance, u = -10 cm
Lens formula :
v is image distance
Magnification,
So, the magnification of the lens is 3.
Answer:
31.1
Explanation:
Trust brother
A 1,000 kg ball traveling at 5 m/s would have kinetic energy. A 10 kg ball traveling at 5 m/s would have kinetic energy. A 100 kg person falling at 5 m/s would have kinetic energy.
Question : 1
mass (m) = 1000 kgvelocity (v) = 5 m/s=》
[tex]k.e = \dfrac{1}{2}mv {}^{2} [/tex]
=》
[tex]k.e = \dfrac{1}{2} \times 1000 \times (5) {}^{2} [/tex]
=》
[tex]k.e = 500 \times 25[/tex]
=》
[tex]k.e = 12500 \: joules[/tex]
kinetic energy = 12500 joules
Question : 2
mass (m) = 10 kgvelocity (v) = 5 m/s=》
[tex]k.e = \dfrac{1}{2} mv {}^{2} [/tex]
=》
[tex]k.e = \dfrac{1}{2} \times 10 \times ({5})^{2} [/tex]
=》
[tex]k.e = 5 \times 25[/tex]
=》
[tex]k.e = 125 \: joules[/tex]
kinetic energy = 125 joules
Question : 3
mass = 100 kgvelocity = 5 m/s=》
[tex]k.e = \dfrac{1}{2} mv {}^{2} [/tex]
=》
[tex]k.e = \frac{1}{2} \times 100 \times (5) {}^{2} [/tex]
=》
[tex]k.e = 50 \times 25[/tex]
=》
[tex]k.e = 1250 \: joules[/tex]
kinetic energy = 1250 joules
2. Give at least 2 major roles of mining in our lives.
Answer:
Mined materials are needed to construct roads and hospitals, to build automobiles and houses, to make computers and satellites, to generate electricity, and to provide the many other goods and services that consumers enjoy.
Explanation:
The angle of incidence of another red ray is 65º. The refractive index of the glass of block
ABCD for red light is 1.62.
(i) Calculate the angle of refraction in the glass for this ray.
Answer:
34º
Explanation:
The computation of the angle of refraction in the glass for this ray is shown below:
Given that
the angle of incidence of another red ray is 65º
And, n_1 = 1
n_2 = 1.62
According to shell law
n_1 sin [tex]\theta[/tex]_1 = n_2 sin [tex]\theta[/tex]_r
sin [tex]\theta[/tex]_r = 1 sin 65÷ 1.62
= 0.559
[tex]\theta[/tex]_r = sin^-1 (0.559)
= 34º
what determines an atom identity
a. electrons
b. protons
c. neutrons
d. atomic mass
Answer:
atomic mass
Explanation:
the identify of the atom is determined by the number of protons
Dr. Kirwan is preparing a slide show that he will present to the executive board at tonight's committee meeting. He places a 3.50-cm slide behind a lens of 20.0 cm focal length in the slide projector. A) How far from the lens should the slide be placed in order to shine on a screen 6.00 m away? B) How wide must the screen be to accommodate the projected image?
Answer:
A) d_o = 20.7 cm
B) h_i = 1.014 m
Explanation:
A) To solve this, we will use the lens equation formula;
1/f = 1/d_o + 1/d_i
Where;
f is focal Length = 20 cm = 0.2
d_o is object distance
d_i is image distance = 6m
1/0.2 = 1/d_o + 1/6
1/d_o = 1/0.2 - 1/6
1/d_o = 4.8333
d_o = 1/4.8333
d_o = 0.207 m
d_o = 20.7 cm
B) to solve this, we will use the magnification equation;
M = h_i/h_o = d_i/d_o
Where;
h_o = 3.5 cm = 0.035 m
d_i = 6 m
d_o = 20.7 cm = 0.207 m
Thus;
h_i = (6/0.207) × 0.035
h_i = 1.014 m
My next photo How's it
Answer:
Pretty good
Explanation:
is there nxt 1
A cannon and a supply of cannonballs are in a sealed system railroad car. The car has a length of 20 meters, and a mass of 2000kg. The cannon fires to the right, the car recoils to the left. Fired cannonballs remain in the car after hitting the wall and land on the floor at the end of the car. The cannonballs have a mass of 15 kg each, and there are ten of them. (neglect mass of cannon) How far will the car move after all ten have been fired
Answer:
The distance the car moves after all ten cannonballs have been fired is 1.5 meters
Explanation:
The parameters given in the question are;
The length of the car = 20 meters
The mass of the of the cannon ball, m₁ = 2,000 kg
The direction the cannon fires = The right
The direction the car recoils = The left
The mass of each cannonball, m₂ = 15 kg
The number of cannonballs = 10
Let v₁ represent the speed of the car and let v₂ represent the speed of the cannonball, where momentum is conserved, we have;
m₁·v₁ = m₂·v₂
2000 × v₁ = 15 × v₂
400·v₁ = 3·v₂
Therefore, when the cannon ball travels 400 meters, the railroad car travels 3 meters
Similarly, when the cannon ball travels 400/20 = 20 meters, the distance the railroad car travels, d = 3/20 meters
We not that the railroad car and the car are brought to a stop each time the cannonball hits the watt
Therefore, the total distance moved by the car after all ten have been fired, [tex]d_{total}[/tex], is given as follows;
[tex]d_{total}[/tex] = d × The number of balls fired
∴ [tex]d_{total}[/tex] = 3/20 meters per ball × 10 balls = 3/2 meters = 1.5 meters
The total distance moved by the car, [tex]d_{total}[/tex] = How far the car moves after all ten have been fired = 1.5 meters.
A machine used 20 J of energy to make a
bicycle start. However, 6 J of energy was
wasted as heat. What is the percentage
efficiency of the machine?
a 30%
b 75%
C 70%
d 60%
Answer:
a. 30%
Explanation:
Given the following data;
Energy as effort, Ee = 20 J
Energy as heat, Eh = 6 J
To find the percentage efficiency (P.E);
P.E = Eh/Ee * 100
Substituting into the formula, we have;
P.E = 6/20 * 100
P.E = 6 * 5
P.E = 30 %
Therefore, the percentage efficiency of the machine is 30 %.
A truck gradually starts off from rest with a uniform
acceleration of 2 m/s2
. It reaches a velocity of 16 m/s. Using the
equation
[tex] {v}^{2}={u }^{2}+2as[/tex]
,calculate the distance it travels while it is
accelerating
Gold atoms find their "birth" inside of huge _________.
Explanation:
he is very keen on taking up and is the age
A student pushes a box to the right with a force of 10 N. At the same time, another
student pushes the same box to the left with a force of 5N.
What is the net force
Answer:
5 N
Explanation:
To find the net force of 2 objects pushing against each other you subtract them and that’s how you get your answer.
The net force acting on a system is defined as the resultant of all the force acting on all the body. The value of net force will be 5N.
What is force?Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body. Force is defined as the product of mass and acceleration. Its unit is Newton.
The given data in the problem will be;
F₁ is the force act to the right = 10 N
F₂ is the force act to the left= 5N
F is the net force=?
According to the equilibrium concept, the net force acting on the body is equal to zero.
F = F₁ - F₂
F = 10-5
F = 5N
Hence the value of net force will be 5N.
To learn more about the force refer to the link;
https://brainly.com/question/26115859
If one light bulb breaks in a series circuit containing three bulbs will it remain lit?
In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. In parallel circuits, each light has its own circuit, so all but one light could be burned out, and the last one will still function
How does refraction allow thin convex lenses to work?
Answer:
https://www.khanacademy.org/science/physics/geometric-optics/lenses/v/convex-lenses
Explanation:
Here is a link to a video to tell you about this.
Describe in brief the importance of measurement in our daily life?
Measurement tools make our lives safer and better? And they increase the quality and quantity of life. Arguably, the ability to measure calculating
physical properties accurately have tremendous survival value that gives humans adaptive, evolutionary advantages sharpened through many years of natural selection.
A rigid body of moment of inertia 0.5 kg.M^2 rotates with 2 RPM. How much torque is needed to increase the rotation to 10 RPM in 5 seconds.
Answer:
T = 0.084 Nm
Explanation:
First, we will calculate the angular acceleration:
[tex]\alpha = \frac{\omega_f - \omega_i}{t}[/tex]
where,
α = angular acceleration = ?
ωf = final angular speed = (10 RPM)(2π rad/1 rev)(1 min/60 s) = 1.05 rad/s
ωi = initial angular speed = (2 RPM)(2π rad/1 rev)(1 min/60 s) = 0.21 rad/s
t = time = 5 s
Therefore,
[tex]\alpha = \frac{1.05\rad/s - 0.21\ rad/s}{5\ s}\\\\\alpha = 0.168\ rad/s^2[/tex]
Now, for the torque:
[tex]T = I\alpha[/tex]
where,
T = torque = ?
I = moment of inertia = 0.5 kg.m²
Therefore,
[tex]T = (0.5\ kg.m^2)(0.168\ rad/s^2)\\[/tex]
T = 0.084 Nm
2) 1. A vibration of an electric charge.
2.Transmits energy from the Sun to Earth
3. A wave which has both an electric and a magnetic component
4. The speed of this wave decreases as the medium becomes
denser.
What type of wave is being described by the statements above?
A) electromagnetic
B) longitudinal
C) mechanical
D) sound
Explanation:
Answers1.Electromagnetic waves
2.Electromagnetic radiation
3.Electromagneticwaves
A 1200 kg car accelerates from rest to 10.0 m/s in a time of 4.50 seconds. Calculate the force that the car’s tires exerted on the road.
please help me i need the answer in 10 mins
Answer:
the force that the car’s tires exerted on the road is 2,666.67 N.
Explanation:
Given;
mass of the car, m = 1,200 kg
initial velocity of the car, u = 0
final velocity of the car, v = 10.0 m/s
time of motion, t = 4.50 s
The force the car’s tires exerted on the road is calculated as follows;
[tex]F = ma= \frac{m(v-u)}{t} \\\\F = \frac{1200(10-0)}{4.5} \\\\F = 2,666.67 \ N[/tex]
Therefore, the force that the car’s tires exerted on the road is 2,666.67 N.
An object on the moon feels lighter than the same object on earth. which statement explains this phenomenon?
A. The moon has less mass than earth.
B. The object has a greater gravitational attraction to the moon.
C. The object has less mass on the moon then on earth.
D. The moon is in orbit around earth.
Answer:
B
Explanation:
cause
Answer: A
Explanation:
The moon has less mass than Earth.
Just took the test.
Which of the following describes a transfer of energy through work?
A student carries a heavy backpack one km
O A laboratory burner is used to heat 250 ml of water to boiling,
O A woman pushes a luggage cart in an airport over a distance of 100 m
O A man pushes on a large piece of furniture for 15 min, but it does not move.
If a person meets an accident, which of the following factors will have more effect on his Kinetic energy and hence on the fatality of the accident?
A.velocity of the vehicle
B.Mass of the vehicle
Answer:
b
Explanation:
Activities that can help reduce the stress level in a family include A. exercising B. reading C. going for a walk D. all of the above Please select the best answer from the choices provided. A B. ОС
Answer:
D. all the above
Explanation:
Took the quiz.
Answer: D) all the above
Explanation: :)
Write your views on pyramid.
=> No copy Paste
=> Conspiracy theories are accepted
Answer:
pyramid is a body or structure whose outer surfaces are triangular and converge to a first step at the the top which base may be in a shape of triangle ,rectangle,square and other any shape.
Explanation:
its volume is equal to product of area of base and height of it..
the lateral surface area of a regular pyramid is equal to the sum of the areas of its lateral faces.
the total surface area of a regular pyramid is equal to the sum of the lateral surface areas of pyramid and base.
Answer:
A pyramid is a polyhedron for which the base is a polygon and all lateral faces are triangles. A pyramid is described by the shape of its base . for example , a triangular pyramid has a triangular base , square pyramid has a square base .hope it is helpful to you
How do media literacy , information literacy and technology literacy and media and information literacy differ in terms of use?
Answer:
Media literacy creates a conscious awareness, the ability to understand, analyze, the messages various media like the newspapers, the radio, that is for the consumer, and it also promotes how best media create information for production.
While information literacy and technology literacy differs from other literacy asked in the question above, as information literacy and technology could be used when describing getting information through adequate research and further dishing out this available information so as to effectively use the information with the aim to solve problems, create awareness, or educate, through technologies such as for example, email.
Lastly, media and information literacy differ in terms of use from the other two explained above, as media and information literacy describes discerning information credibility, accuracy, and objectivity of sources they come from, and it shows people how important it is to have credible information to make informed judgments and the ethical use of the information they consume.
Describe or identify some uses of an electromagnet.
Answer:
Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.Explanation:
An aircraft with a landing speed of 295km/h lands on an aircraft carrier with a landing area 205m long . Find the maximum constant deceleration required for the a safe landing
Doing science by inquiry always involves:
U will be marked as brainlest if you solve this ex
Answer:
.
Explanation:
name them all
then multiply
after it simplify