Answer:b
Explanation:
A car stops with an acceleration of -20 m/s/s in 8 seconds. How far did it go while stopping?
Answer:
640 m.
Explanation:
The following data were obtained from the question:
Acceleration (a) = –20 m/s/s
Time (t) = 8 s
Final velocity (v) = 0 m/s
Distance (s) =.?
Next, we shall determine the initial velocity (u) of the car. This can be obtained as follow:
Acceleration (a) = –20 m/s/s
Time (t) = 8 s
Final velocity (v) = 0 m/s
Initial velocity (u)
a = (v – u) / t
–20 = (0 – u) / 8
–20 = – u / 8
Cross multiply
–20 × 8 = – u
– 160 = – u
Divide both side by – 1
u = – 160 / – 1
u = 160 m/s
Finally, we shall determine the distance travelled by the car before stopping as follow:
Time (t) = 8 s
Final velocity (v) = 0 m/s
Initial velocity (u) = 160 m/s
Distance (s) =.?
s = (v + u)t /2
s = (0 + 160) × 8 /2
s = (160 × 8) /2
s = 1280 / 2
s = 640 m
Therefore, the car travelled 640 m before stopping.
Question 7 of 10
Which event is an example of melting?
A. People see their breath on a cold winter day.
B. Dew forms on the leaves of a tree.
C. Frost forms on a blade of grass.
O D. An ice cube forms a small puddle on the counter.
When momentum is transferred from one object to another, their combined momentum remains the same. * True or False
Answer:
true
Explanation:
hope this helps
what is the formula for calculating gravitational potential energy
Answer:
PEgrav = m *• g • h
Explanation:
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.
Hope this helps
Find the direction of the sum of
these two vectors:
12.0 m
45.0°
9.66 m. A
m A,
Answer:
82.2
Explanation:
If you could repeat the lab and make it better, what would you do differently and why? There are always ways that labs can be improved. Now that you are a veteran of this lab and have experience with the procedure, offer some advice to the next scientist about what you suggest and why. Your answer should be at least two to three sentences in length.
Answer:
I suggest that you recheck your answers multiple times and make sure that they are making sense. Also I think that you should Study the organisms very well and you should be careful when making observations so that you really are sure that the organism has 4 wings and not only 2 wings(for example).
Explanation:
I hope this answers your question
PLEASE MARK ME BRAINLIEST :) :) :) :) :)
Plzzzzzzzz helppp me 10 pointsssssssssssssss!!
Question:
How is the shell of a hard-boiled egg similar to the Earth’s crust?
Question:
Besides an egg, provide your own example of some object you may know that could be seen as a model of the Earth’s crust.
PLZZ help and answer BOTH
Use the information from the graph to answer the question. What is the acceleration of the object?
m/s2
The acceleration of the object is determined as -2.5 m/s².
What is acceleration?Acceleration is the rate of change of velocity with time.
Mathematically, acceleration is given as;
a = Δv/Δt
a = (v₂ - v₁)/(t₂ - t₁)
where;
v₂ is the final velocityv₁ is the initial velocityt₂ is the final timet₁ is the initial timeFrom the graph;
the initial velocity = 40 m/s
the final velocity = 10 m/s
the final time = 12 seconds
the initial time = 0 second
acceleration = (10 - 40) / (12 - 0)
acceleration = -30/12
acceleration = -2.5 m/s²
Thus, the acceleration of the object is determined as -2.5 m/s².
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Potential energy calculation - MxGxH. Gravity equals 10. How much
potential energy does a 5 gram golf ball that is falling from 40 ft have? Use
your calculator if need be. *
Answer:
Ep = 0.6095 [J]
Explanation:
As defined in the problem statement, potential energy is defined as the product of mass by gravity by height. But first we must convert all the values given to measures of the international system (SI)
g = gravity = 10 [m/s^2]
h = elevation = 40 [ft] = 12.19 [m]
m = mass = 5 [g] = 0.005 [kg]
Ep = potential energy [J]
Ep = 0.005*10*12.19 = 0.6095 [J]
A piece of wood is measured to have 2 cm x 5 cm x 3 cm of volume. Its mass is 20.0 g. What is its density?
Answer:
[tex]\boxed {\tt \frac{2}{3} \ or \ 0.666666667 \ g/cm^3}[/tex]
Explanation:
Density can be found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass is 20 grams.
We have to find the volume.
To find the volume, multiply the length by the width by the height. V= l*w*h l= 2 cm, w= 5 cm, h= 3 cmV= 2 cm * 5 cm * 3 cm = 30 cm³[tex]m= 20 \ g\\v= 30 \ cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{20 \ g}{30 \ cm^3}[/tex]
Divide.
[tex]d=\frac{2}{3} \ g/cm^3[/tex]
[tex]d= 0.666666667 \ g/cm^3[/tex]
The density is 2/3 grams per cubic centimeter.
PLS HELP ASAP!! How many calories are required to melt a 10g ice cube which is at 0° C?
A. 10 cal
B. 800 cal
C. 80 cal
D. 540 cal
Answer:
800 calories are required to melt a 10g ice cube which is at 0 degrees C.
Explanation:
hope this helps, have an amazing day
A construction worker drops a brick off a high scaffold. If the brick lands 5.0 s later, how fast was the brick travelling the instant before hitting the ground?
Answer:
The brick was traveling at 49 m/s the instant before hitting the ground.
Explanation:
When an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is [tex]g = 9.8 m/s^2[/tex].
The final velocity of a free-falling object after a time t is given by:
[tex]vf=g.t[/tex]
The distance traveled by a dropped object is:
[tex]\displaystyle y=\frac{gt^2}{2}[/tex]
The brick takes 5 seconds to land from the high scaffold. The speed at which it lands is:
[tex]vf=9.8\cdot 5[/tex]
vf=49 m/s
The brick was traveling at 49 m/s the instant before hitting the ground.
HElP ME PLEASSEEEE ITS URGENT!!!
Answer:
1. states
2. kinetic theory
3.particles cqlled atoms
4.motion
5.collide
thats all I remember
what is kinetice energy
Answer:
energy which a body possesses by virtue of being in motion.
Answer:
kinetic energy, simply, is movement energy. it is energy which an object posses for its motion. in order to accelerate the object force must be applied. examples include:
moving your hand a ball rolling runningWhy do we use scatter plots for most data in Physical Science? Question 1 options: because the teacher said to use scatter plots because scatter plots show 100% of the data like a pie because scatter plots show the relationship between the independent and dependent variables because scatter plots show data for categories that do not overlap
Answer:
scatter plots show the relationship between the independent and dependent variables
Explanation:
A scatter plot is a graph which shows two variables plotted along two axes (usually the x and y axes). Scatter plots are useful in establishing any form of correlation between the dependent and independent variables in any study.
Correlation simply means the degree of relationship between variables, that is, how much does one variable affect the other? When scatter plots are almost a straight line graph, there is a high correlation between the variables. When the points in a scatter plot are isolated, there is little (sometimes zero) correlation between the variables.
How far will you travel if you run for 30 seconds at 6m/sec?
Define kinetic energy and thermal energy. Describe what happens to each as the temperature of a substances increases.
Answer:
All matter is made up of particles that are constantly moving. The motion of the particles results in kinetic energy. The part of total internal energy that can be transferred is thermal energy. As temperature increases, the particles in a substance move faster and have greater kinetic and thermal energy.
Explanation:
electric bulb connected to a 220 volt supply line draw a current of 0.05 ampere calculate the amount of coulomb super second following to the bulb
You don't need to calculate anything.
You said "0.05 Ampere".
"Ampere" means "coulomb per second".
A speed-time graph is shown below:
Speed vs. Time
What is the average acceleration of the object represented in the graph above over the eight seconds?
A) 0.5 cm/s2
B) 1.0 cm/s2
C) 1.5 cm/s2
D) 2.0 cm/s2
Answer:
The average acceleration of the object is 0.5 cm/s^2. Answer: A)
Explanation:
Average Acceleration
The average acceleration of a moving object is the rate at which the speed changed over time in a specific period. It can be calculated as follows:
[tex]\displaystyle \bar a=\frac{v_f-v_o}{t}[/tex]
Where vf is the final speed, vo is the initial speed and t is the time.
The speed-time shows the speed starts at 0 cm/s and ends at 4 cm/s over the 8 seconds period. The average acceleration is:
[tex]\displaystyle \bar a=\frac{4-0}{8}=0.5[/tex]
The average acceleration is 0.5 cm/s^2
A) Correct. The average acceleration is 0.5 cm/s^2
B) Incorrect. The average acceleration is 0.5 cm/s^2
C) Incorrect. The average acceleration is 0.5 cm/s^2
D) Incorrect. The average acceleration is 0.5 cm/s^2
Answer:
A) 0.5 cm/s2
Explanation
I took the quiz the correct answer is A
A person walks 2.00 m east, then turns and goes 4.00 m west, then turns and goes back 1.00m East
what is the persons displacement?
Answer: what is the person’s distance
A 25.1 kg boy climbs to the top of a 11.08 m tall water slide at an amusement park. He carries a 2.94 kg rubber ball with him. Taking the bottom of the slide to be the zero point, what is the gravitational potential of just the boy in joules? (do not include units)
Answer:
3080
Explanation:
Potential energy is the energy stored or contained in a body as a result to its relative position to other objects, an example is an object that is placed at a height above the ground thereby experiencing gravitational energy.
Potential energy = mass × gravity × height
Given that: height = 11.08 m, gravity = 9.81 m/s² and mass = mass of boy + mass of ball = 25.1 + 2.94 = 28.34 kg
Potential energy =28.34 × 9.81 × 11.08 = 3080
Which of the following correctly lists the energy conversions that happen when you plug a fan into an electrical outlet and turn it on?
A: chemical, nuclear, potential
B: sound,thermal, kinetic
C:sound,nuclear,electrical
D:chemical,sound,fission
Ruby wants to find out what variables affect the rate at which sugar dissolves in water. She records different information about four containers of water and sugar, as shown in the table below.
Which two containers should Ruby choose to investigate the effect that temperature has on the rate at which sugar dissolves?
Answer:
The correct answer is - containers 1 and 3.
Explanation:
In any experiment or investigation, there must be all the factors should be constant other than the variable that is changed to see the effect on the result or desired character.
In this experiment to check the effect of the temperature, there must be the only temperature is a variable that should be manipulated rest should remain constant. In container 1st and 3rd, all the variable amount of sugar, the method of mixing all are the same except temperature.
Thus, the correct answer is - 1 and 3rd.
PART II – CHOOSING THE APPROPRIATE UNIT For each example below choose the appropriate unit to measure each (mm, cm, m or km). 1. Width of physics book _____ 2. Distance from New York to Utah _____ 3. Length of fingernail _____ 4. Length of hallway _____ 5. Height of a mountain _____ 6. Length of a fork _____ 7. Distance between cities _____ 8. Width of your eyeball _____
Answer:
Explanation:
In this unit of measurement for distance or length, the units are arranged from the least to the largest unit i.e
mm < cm < m < km
Where mm is millimeter, cm is centimeter, m is meter and km is kilometer.
Hence, the appropriate unit to be used depends on how small or wide the length/distance being referred to is. For instance, the length of a stapler pin should be measured in millimeter while the length of a pen should be measured in centimeter. The appropriate measurement can be determined by determining the closest unit the value falls into. For instance, there is no need to refer to a length as 1000 cm when it can be referred to as 10 m (since 100 cm equals 1 m)
1. Width of a physics book should be measured in centimeters (this is similar to length of a pen).
2. Distance from New York to Utah should be measured in kilometers (Distance between far cities or states are measured in kilometers).
3. Length of a fingernail should be measured in millimeters (this is similar to the length of a stapler pin)
4. Length of hallway should be measured in meters (This is generally larger than centimeter but lesser than kilometer)
5. Height of a mountain should be measured in kilometers (This is usually a very long distance from the earth surface)
6. Length of a fork should be measured in centimeters (This is similar to the length of a pen).
7. Distance between cities should be measured in meters (except the distance is far apart, distance between close cities are measured in meters)
8. Width of the eyeball should be measured in millimeters (similar to the length of a stapler pin and fingernail).
what’s the relationship between height and potential energy?
Answer:
the higher up an object is, the more potential energy it has
Explanation:
Which property of air makes it effective in protecting firefighters?
The property of air which makes it effective in protecting firefighters is that it is a poor thermal conductor.
What is air?We define air as a mixture of gasses. We know that there a re several gases that are known to compose air and among these are oxygen, carbon dioxide, noble gasses and nitrogen.
We know that air is a poor conductor of heat. As such, air does not heat up quite easily and this would help to protect the fireman from getting burnt since air does not easily allow heat to pass through it as it were, this is why the firefighters depend on the insulative property of air.
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What does it mean to say that mass is conserved during a physical change?
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
Answer:
100% oon test
Explanation:This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
What would be 1/2 times 800?
Answer:
The answer is 400
Explanation:
What happens to a circuit's R, V, and I when you change the length of the wire
in the circuit?
The resistance in a circuit is directly proportional to the length of the wire. Thus as the length increases, R increases and current I decrease. But the voltage v remains constant.
What is Ohm's law ?Ohm's law states that, the voltage across a circuit is the product of the current and resistance.
Thus, V = I R
The resistance R is expressed by the expression:
R = ρ l/a
where ρ is the proportionality constant called resistivity and l and a be the length and area of the wire.
Thus, as the length increases, resistance also increases.
The increase in resistance result in a decrease the current through the circuit. Therefore, voltage remains constant. Hence, option B is correct.
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To win the game, a place kicker must kick a football from a point 21 m (22.9656 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 16 m/s at an angle of 55.3◦ from the horizontal. The acceleration of gravity is 9.8 m/s^2 By how much vertical distance does the ball clear the crossbar? Answer in units of m
In projectile horizontal distance is given by :
[tex]h = \dfrac{u^2sin^ 2\theta}{2g}[/tex]
Putting all given values, we get :
[tex]h = \dfrac{u^2sin^ 2\theta}{2g}\\\\h=\dfrac{16^2\times sin^2 \ 55.3^o}{2\times 9.8}\\\\h=13.1\ m[/tex]
Therefore, maximum height of football is 13.1 m.
Hence, this is the required solution.
