Answer:
a. -For example, when you go to the supermarket with your parents and they let you drive the cart. You step on the back and push off which lets you get far in the isle, but in a bit you start slowing down
and eventually stop at all.
b. -First, when a car is driving the wheels meet friction all the time, as that happens the wheels get a bit hot.
-Second, when you are cold you rub your hands together fast until they are warm.
c.-First, you wouldn't be able to land an airplane correctly and it would be very, very hard to stop it from moving, as well as the car .
-We wouldn't be able to ice skate, we wouldn’t be able to slow down and turn normally.
Explanation:
(a) Friction is the force that opposes the rubber tyre from sliding on the road surface. This friction avoids skidding of vehicles. Applications of breaks in the vehicle to stop it- Friction braking is the most widely used braking method in vehicles.
(b) When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire.
(c)
Walking. Without friction between the shoes and the ground, you cannot walk properly. Driving. Writing. Rubbing of Hands for Warmth.Skating.Lighting Matchsticks.What is friction ?"Force that resists the sliding or rolling of one solid object over another." Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion.
What is kinetic energy ?"Kinetic energy is a form of energy that an object or a particle has by reason of its motion." If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
What is thermal energy ?"Thermal energy refers to the energy contained within a system that is responsible for its temperature." Heat is the flow of thermal energy. A whole branch of physics, thermodynamics, deals with how heat is transferred between different systems and how work is done in the process.
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What is the applied voltage of a circuit that draws 2 amps through 2 Ohms of Resistance?
Answer:
255 volts
Explanation:
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The period of a sound wave coming from an instrument is 0.002 seconds. what is the frequency of the sound? hz
The frequency of the sound will be 500 Hz. The frequency of the sound is the inverse of the time period.
What is the frequency of the sound?A sound pressure wave's frequency, also known as pitch, is the number of times it repeats itself every second.
The frequency of the sound is the inverse of the time period. The frequency is given as;
[tex]\rm f= \frac{1}{t} \\\\ \rm f= \frac{1}{0.002 } \\\\ \rm f= 500 \ Hz[/tex]
Hence the frequency of the sound will be 500 Hz.
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Answer:
500 Hz
Explanation:
got it right on edge
Question 1 (1 point)
You pick up a box of books. The box is labeled 50N. What is the actual mass of the
box?
50N
5.1 kg
490 kg
9.8 m/s2
Answer:
[tex]actual \: mass \: of \: the \: box \: is = 5.0kg[/tex]
Explanation:
[tex]the \: actual \: mass \: of \: the \: box \: is \: m \: = \frac{w}{g} \: = \frac{50}{10} = 5.0kg[/tex]
What wave moves in the same direction as the force that created it?
Calculate kinetic energy in joules of 1500 kg of a car moving 18m/s
Answer:
240,000 J
Explanation:
KE = 1/2mv² = 1/2 (1500kg)(18m/s)² = 240,000 J
What type of relationship exists between momentum and mass?
a. direct
b. inverses
c. logarithmic
d. quadratic
Answer:
A. Direct
Explanation:
Thats just how it be
Answer:
Direct
Explanation:
EDGE 2020
What is the purpose of the cytoplasm
Answer:
:)
Explanation:
The cytoplasm provides a medium for the organelles to remain suspended. The cytoplasm acts as a buffer and protects the genetic material of the cell and also the cellular organelles from damage caused due to movement and collision with other cells. Cellular respiration begins in the cytoplasm with glycolysis
What is the pattern for mass, speed, and energy.
Please answer this asap.
thanks.
Answer:
The kinetic energy of a moving object is directly proportional to its mass and directly proportional to the square of its velocity. This means that an object with twice the mass and equal speed will have twice the kinetic energy while an object with equal mass and twice the speed will have quadruple the kinetic energy.
Explanation:
According to Newton’s second law of motion, which object will require the most force in order to change its motion?
A.
The one with the greatest mass and fastest speed
B.
The one with the least mass and greatest speed
C.
The one with the greatest mass and lowest speed
D.
The one with the least mass and slowest speed
Answer:
A. The one with the greatest mass and fastest speed
Explanation:
Newton's Second Law of Motion
F ∝ ma F ∝ m(v - u)F ∝ mv - muF ∝ ΔPSo, as per the equation the force required to be applied is directly proportional to the change in momentum.
Therefore, we can understand two things :-
More mass = more force requiredFaster speed = more force requiredThe correct option is A.
A torch has 150J of energy supplied from a battery,
70J are transferred to light, 80J goes to heat, what is
the efficiency of the torch?
The efficiency of the torch light from the total energy supplied and useful energy is 46.7%.
Efficiency of the torch
The efficiency of the torch is the amount of energy used to produce light compared to the total energy supplied to the torch light. This can also be called useful energy.
Total energy supplied to the torch = 150 J
Total energy used to produce light = 70 J
The efficiency of the torch light is calculated as follows;
Efficiency = 70/150 x 100%
Efficiency = 46.7%
Thus, the efficiency of the torch light from the total energy supplied and useful energy is 46.7%.
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An eighth-grade teacher has asked you to present information to her students about how watching television can affect adolescents’ academics and behavior. What important information should you share with this audience?
Write an essay that will serve as the basis for the speech you will deliver to the students. Include important details from the selection "Television and Adolescents" to support your discussion.
As you write, remember your essay will be scored based on how well you:
develop a multi-paragraph response to the assigned topic that clearly communicates your controlling idea to the audience.
support your controlling idea with meaningful examples, information, and references for the text.
cite direct quotes and any information that has been paraphrased from the passages that you have read.
organize your essay in a clear and logical manner, including an introduction, body, and conclusion.
use well-structured sentences and language that are appropriate for your audience.
edit your work to conform to the conventions of standard American English.
Answer:
Depending on the research you find, it could vary. Explain to them that while watching TV is not an "evil" thing, it can have some effects in the youth. Tell them how it can affect the behavior with friends, family and other people whom are around them. In addition you could even as far as mentioning academic success and failure. Studies confirmed that the television media influences children behavior since early ages. It is extremely prejudicial to expose young children to television for many reasons such as: underdevelopment, optical issues, brain damage, difficulty of learning, speaking and obesity.By the time these kids become adolescents they are obese, sedentary, with heart illness and other psychological disorders. The exposure to violence, are also damaging for their mental healthy and behavior. Kids that spend great part of their time watching tv or playing video games are more susceptible to depression and mental diseases. In order to avoid these pathologies, children must be encourage to play outside and practice sports.
Watching television is very much informative on one side if we use it effectively but the prolonged use and involving more in entertainments definitely affects the academics of students and even in their behavior badly.
What are the effects of watching television on adolescents’ academics and behavior ?By the time they turn 15, the typical child born today will have spent more time watching television than in school. According to research, watching a lot of violent TV is linked to the emergence of aggressive attitudes and actions.
Television seems to encourage stereotypes about race and gender roles as well. Last but not least, television advertisements frequently prey on kids' innocence and can encourage and promote excessive materialism.
All of these negative effects can be lessened if parents limit their children's overall television consumption, support some shows while discouraging others, and constantly discuss the meaning of what they see with them.
It is challenging to assert that television programming has no impact on young people. Yet, it is similarly challenging to isolate individual shows or programming genres as the root of certain behaviors in kids without taking into account the countless alternative influences that might have an impact on their behavior.
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a rocket accelerates upwards from rest to a speed of 12km/s in 8 seconds calculate the acceleration
Answer: 1.5 km/s²
Explanation:
Given that,
Initial speed Vi = 0 km/s
Final speed Vf = 12km/s
Acceleration A = ?
Time taken T = 8 seconds
Recall that acceleration is the rate of change of velocity per unit time
i.e acceleration = (Vf - Vi)/T
A = (12km/s - 0km/s) / 8 seconds
A = 12km/s / 8 seconds
A = 1.5 km/s²
Thus, the acceleration of the rocket is 1.5 km/s²
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Contrary to popular belief, a ski jumper does not achieve a large amount of "air" when doing a jump (less than 6 feet). This is because the ramp is almost horizontal while the landing is a steep hill. If a ski jumper leaves the hill at 26 m/s in the horizontal direction then travels 240 meters down the slope, what was the vertical distance (dy) that the ski jumper fell?
Answer:
The vertical distance that the ski jumper fell is 417.45 m.
Explanation:
Given;
initial horizontal velocity of the jumper, [tex]V_x[/tex] = 26 m/s
horizontal distance of the jumper, dx = 240 m
The time of the motion is given by;
dx = Vₓt
t = dx / Vₓ
t = 240 / 26
t = 9.23 s
The vertical distance traveled by the diver is given by;
[tex]d_y = V_yt + \frac{1}{2}gt^2[/tex]
initial vertical velocity, [tex]V_y[/tex], = 0
[tex]d_y = \frac{1}{2}gt^2\\\\d_y = \frac{1}{2}(9.8)(9.23)^2\\\\d_y = 417.45 \ m[/tex]
Therefore, the vertical distance that the ski jumper fell is 417.45 m.
how to calculate load
Find direction of sum
Explanation:
V² = Vx² + Vy²
= [3.14 cos(30)]² + [2.71 cos(300)]²
= 9.23
V = root 9.23 = 3.038
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Small rocky bodies that are thought to be leftover remnants from the formation of the solar system are called __________. Which term best completes the sentence
An asteroid is a type of space rock, much smaller than a planet, and moves in an elliptical orbit around the Sun.
What are asteroids?It is a smaller body that is part of the solar system and has a diameter of less than 1,000 kilometers.
Asteroids are the subject of constant study due to the proximity they maintain to Earth, despite the fact that the chances of their impacting are very low despite the fact that they have reached the planet in a very remote past.
Therefore, we can conclude that asteroids are characterized by having a very weak gravitational force, they are celestial bodies that orbit around the Sun, and that they are remnants of the matter that gave rise to the Solar System.
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Pls help me with this
Quickly
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Answer:
D
Explanation:
Since the full cart has more mass because of the objects, it requires more force to stop.
Answer:
D
Explanation:
Why can’t security gates detect plastic bomb ?
Answer:
The plastic is too much like other things that are allowed. Sometimes it is too thin, as well. Or sometimes the gates are just not that modern and advanced enough to detect them.
The transit method of planet detection works best for.
Answer:
big planets in edge-on orbits around small stars.
Explanation:
Big planets in edge-on orbits around small stars.
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8Why do ionic
compounds tend to
have high meling
and boiling points?
Answer: Ionic compounds have high melting points and boiling points because the electrostatic forces of attraction between oppositely charged ions are strong and large amount of energy is require to separate the ions.
Explanation:
A space traveler discovers that her weight on a new planet is 192 newtons. Her mass is 68 kilograms. What is the gravitational acceleration of the new planet?
A). 2.8 m/s²
В.) 9.8 m/s²
C.) 34 m/s²
D.) 68 m/s²
Answer:
g ≈ 2.82 m/s^2
Explanation:
By W = mg,
W = weight (in newtons)
m = mass (in kg)
g = gravitational acceleration (in m/s^2)
[tex]192 = 68g[/tex]
[tex]g = 2.82352941176 m/s^2[/tex]
g ≈ 2.82 m/s^2
Who is credited with discovering the atomic nucleus.
Answer: Ernest Rutherford's
Help me please my teacher requires work!!
An object has a constant acceleration of 2.0 meters per second4. The time required for the object to accelerate from 8.0 meters per second to 28 meters per second is
Combined gas law, A gas balloon has a volume of 106L when the temperature is 318K and the pressure is 1.5 atm. What will its volume be at 293 K and 2 atm.
P1 x v1/t1 = p2 x v2 / t2
use the given values:
1.5 x 106 / 318 = 2 x v2 / 293
Simplify:
0.5 = (2 x v2)/293
Multiply both sides by 293:
146.5 = 2 x v2
Divide both sides by 2:
V2 = 73.25 L
Answer: 73.25 L
What is the relationship between speed and kinetic energy?
Explanation:
In physics, the kinetic energy (KE) of an object is the energy that it possesses due to its motion.[1] It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.
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The isotope of an atom containing 40 protons and 51 neutrons suddenly has two neutrons added to it.
What isotope is created?
Zirconium-53
Zirconium-93
Antimony-93
Antimony-53
Answer:
Hey, the answer is Zirconium-93
Explanation:
Im very positive about this question, so i hope I helped you ;p
Answer:
Zirconium-93
Explanation:
when we add up the 40 protons and 53 neutrons it gives 93 and a protons and neutron 93 gives a Zirconium-93
Thanks theres your answer
The name for the compound with the formula CuBr2 would be written as
a. copper(II) bromide.
b. copper(1) bromide.
c. copper bromine.
d. copper(III) bromid
HURRY PLZ
Answer:
A. Copper (ll) bromide
How much force is needed to accelerate a 62 kg skier at 3 m/sec2?
Answer:
The answer is 186 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 62 kg
acceleration = 3 m/s²
We have the final answer as
force = 62 × 3
We have the final answer as
186 NHope this helps you
16. Why does the spoon handle look broken where it enters the surface of the water?
A. The water magnifies the spoon
B. The water reflects the light differently
C. Light waves are refracted and speed up when they pass through the water
D. Light waves are refracted and slow down when they pass through the
water
Answer:
D.
Explanation:
A boat travels with a velocity equal to 14.0 meters per second, east in 6.15 seconds. What distance in meters does the boat travel?
Answer:
Distance, d is 86.1 meters.
Explanation:
Given the following data;
Time, t = 6.15secs
Velocity = 14m/s
Velocity can be defined as the rate of change in displacement (distance) with time. Velocity is a vector quantity and as such it has both magnitude and direction.
Mathematically, velocity is given by the equation;
[tex]Velocity = \frac{distance}{time}[/tex]
[tex]V = \frac{d}{t}[/tex]
[tex]d = Vt[/tex]
Substituting into the above equation;
[tex]d = 14 * 6.15[/tex]
d = 86.1m
Hence, the distance traveled by the boat is 86.1 meters.