Brainliest if correct Question 7 of 10
Which two options are forms of potential energy?
A. Nuclear energy
B. Electrical energy
C. Thermal energy
D. Sound energy
E. Chemical energy
Answer:
Electrical energy and Chemical energy
Explanation:
Good luck on the quiz dawg, I'm doing the same one LOL
What is the mass of a material whose temperature changes from -12°C to 80°C when 4,577 J heat energy is added to it if the specific heat capacity of the material
is 7.0 J/g°C? Give your answer to 2 decimal places.
[tex] \frac{4577}{7 \times (80 - ( - 12))} \\ \frac{4577}{7 \times92 } \\ \frac{4577}{644} \\ = 8.5g[/tex]
7th grade science i mark as brainliest
24. An elevator is moving vertically up with an acceleration a. The force exerted on the floor by a passenger of mass m is
(a) mg (b) ma (c) mg - ma (e) none of these (d) mg + ma
Given :-
An elevator is moving vertically up with an acceleration a.To Find :-
The force exerted on the floor by a passenger of mass m .Solution :-
As the man is in a accelerated frame that is non inertial frame , we would have to think of a pseudo force .
The direction of this force is opposite to the direction of acceleration the frame and its magnitude is equal to the product of mass of the concerned body with the acceleration of the frame .For the FBD refer to the attachment . From that ,
[tex] \implies Weight_{apparent}= mg + ma [/tex]
Hence option d is correct choice .
I hope this helps .
A granite block is at rest on a horizontal surface in a vacuum chamber. The granite block is 3 cm tall, and the length and width are both 20 cm. The density of granite is 2.75 g/cm^3. What pressure does the block exert on the surface?
Answer:
M = V ρ = .03 * .2*2 cm^3 * 2.75 g / cm^3 = .0033 kg weight
W = m g = .0033 kg * 9.80 m / s^2 = .032 N
P = F / A = W / A = .032 N / .2^2 m^2 = .80 N/m^2 = .80 Pascal
1. One light goes out, they all go out
correct answer:✅series
Voltage and current are directly related
wrong answers: no circuits and parallel
hint:More voltage from the battery pushes more current through.
resistance and current are directly related
wrong answers: all circuits and parallel
hint: If you have more resistance in a circuit, does the current go up? That's what would happen if they were directly related.
Voltage and resistance are unrelated
correct answer:✅all circuits
answer choices are series, parallel, all circuits, and no circuits
2.Which will make the electromagnet weaker?
correct answer:Unwrapping some of the coils.
3.Why do gases exert more pressure or increase their volume when the temperature is raised?
correct answer:At higher temperatures, the particles of a gas move faster. This increase in kinetic energy can increase the pressure and / or the volume of the gas.
hint: A few reminders of definitions from last semester:
Kinetic energy is the energy of motion.
Temperature is the average kinetic energy of the particles in a sample.
For a gas:
Temperature and pressure are directly related.
Temperature and volume are directly related.
Pressure and volume are inversely related.
4.Which group naturally achieves the octet rule without gaining or losing electrons?
correct answer:Noble gases
5.Label each as a physical or chemical property/change.
Shiny -✅physical
electrolyte -✅physical
highly reactive -✅chemical
In the presence of oxygen, will form carbon dioxide and water -✅chemical
maellable -✅physical
rusts -✅chemical
acid rain erodes statues and monuments -✅chemical
6.Which statement is true about the groups on the periodic table?
correct answer:The halogens have 7 valence electrons and form -1 ions.
7. Match the word to its definition.
the stuff that gets dissolved in a solution -✅solute
the stuff that does the dissolving in a solution -✅solvent
this determines the amplitude of a wave - ✅energy
the change in frequency of a wave as the object that is producing it moves towards or away from you -✅Doppler Effect
The material that a wave moves through-✅medium
Wave whose matter vibrates perpendicular to the direction the wave travels -✅ transverse
An atom of an element that has a specific number or neutrons, such as Carbon-14. -✅isotope
8.Check all true statements about the dog as it runs the obstacle course.
✅If the dog has the highest average speed, he will win the race.
✅A heavier dog will have a harder time changing direction on the course because it has more inertia than the small dog.
✅As the dog turns, his velocity changes as he changes direction.
( I got a 2.4 out of 4 on this questions, the other options were)
Whenever the dog speeds up, slows down, or changes direction, he is accelerating.
The dog's speed is constant throughout the race.
The weight of the dog will be the same if the competition was held on the moon.
If the doe can double his net force on an obstacle, his acceleration will be cut in half.
The mass of the dog will be the same if you take him to the international space station.
the wrong answer was❌The dog's velocity is constant throughout the race. because the speed and direction changed throughout, the velocity is not constant.
9.Match each atom with the correct element it represents. Make sure you are using your periodic table (Links to an external site.)
✅ Beryllium
✅ Lithium
✅ Helium
✅ Carbon
(image below is for question 9)
Explanation:
ndndndndnndndndndndndndnndndnd
Answer:
teysyshnk
Explanation:
a computer printer has a width of 18in. What is it’s width in meters
Answer:
0.4572 m
Explanation:
To convert inch to metre, divide the value by 39.37.
=》1 inch = 0.0254 metre
So,
18/39.37 = 0.4572 m
Hope it helps ⚜
The width of the printer is 0.4572 meters.
What is metric conversion system?The metric conversion system is a standardized system of measurement based on the International System of Units (SI). It is used by scientists, engineers, and many others around the world to ensure consistency and accuracy in measurement.
The system is based on a series of prefixes that can be added to a base unit of measurement to create multiples or fractions of that unit. For example, the prefix "kilo-" means "thousand," so one kilometer is equal to 1,000 meters. The metric system is widely used in scientific and technical fields and is also the official system of measurement for many countries.
To convert inches to meters, we can use the conversion factor 1 inch = 0.0254 meters.
So, the width of the printer in meters is:
18 inches x 0.0254 meters/inch = 0.4572 meters
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Ben and Dan both weigh 600 N. They are doing pull-ups together. Each pull-up is 0.5 meters of distance. How much work do they each do for every pull-up? 300 J 600 J 1200 J 1500 J
Answer:
300 J
Explanation:
Work = (Force)*(distance) = 600 N ∗ 0.5 m = 300 J
what parts of an electric generator are connected?
Answer:
The field and winding
Explanation: they are both connected
Do you think protection of one species can protect its community? Why?
Answer:
I think that protection of one species can not protect its community.
Explanation:
The advantage of protecting entire ecosystems is the most effective way to save species because species confined to a small area could be wiped out by a single natural disaster. Some species require a large range to find adequate food or mate. Therefore, protecting the habitats of endangered and threatened species often means preserving or managing large areas (entire ecosystem).
if i release one steel ball from the top of a ramp and the other ball from the 40cm mark will they have the same velocity?
Answer:
Yes.
Explanation:
Assuming that the balls weigh the same, then they would have the same velocity. Velocity is the term used to describe the speed at which an object is traveling.
If you are driving 80 km/h along a straight road and you look to the side for 2.1 s , how far do you travel during this inattentive period?
How long does it take light to travel through a 5.20- mm -thick piece of window glass?
Through what thickness of water could light travel in the same amount of time?
Explanation:
Explanation: The speed of light in a vacuum is 3⋅108 m/s . We can now convert to a more appropriate symbol, such as the nanoseconds. So, it will take light approximately 333
200,000 kilometers per secondrefractive index of 1.5).
what is an example of friction on an object in motion?
Answer:
Friction drag force causes objects to slow down as they move through a fluid, such as air or water. ... As an object's speed increases, the drag force from the fluid increases exponentially. • For example, when you drive at high speeds, the frictional force of air on the car increases, and fuel economy decreases.
You walk from chisale to st Francis a distance of 6km/h and 50minutes.Find the average speed in m/s
Answer:
[tex]{ \tt{average \: speed = \frac{distance}{time} }} \\ \\ { \tt{ = \frac{(6 \times 1000) \: m}{(50 \times 60) \: s} }} \\ \\ { \tt{ = \frac{6000}{3000} }} \\ \\ = { \underline{ \tt{ \: 2 \: {ms}^{ - 1} \: }}}[/tex]
You walk from chisale to st Francis a distance of 6km/h and 50minutes, the average speed in m/s will be 2m/s
What is average speed ?The average speed of a moving object is defined as the total distance covered by it divided by the total time taken.
The S.I unit of speed is meter per second. Speed is also measured in kilometer per hour.
Average speed is a scaler quantity
Average speed is the total distance travelled by an object to the total time taken. However, average velocity is the change in position or displacement (∆x) divided by the time intervals (∆t) in which the displacement occurs. No matter how many times the speed has been changed to travel the entire distance , average speed is that constant speed value with which one can travel by and reach the same distance in same amount of time .
It can be calculated with a formula average speed = distance / time
given
distance = 6 km = 6000 m
time = 50 minutes = 50 * 60 = 3000 sec
average speed = distance / time
= 6000 / 3000 = 2m/s
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If a box that weighs 4.00 N slides across a flat rough table for a distance of 2.00 m then how much work does the weight of the box
do on the box?
A) 88.0 J
B) 456 J
C) 270 J
D) 513 J
E)zero
Answer:
0
Explanation:
Here it's given that the weight of the box is 4N and it slides across a rough table for a distance of 2m . And we are interested in finding out the work done by the weight of the block. Firstly we know that , Work done is ,
[tex]\rm\longrightarrow \pink{ Work\ = \ F.s = |F||s|cos\theta} [/tex]
where
[tex]\theta[/tex] is the angle between displacement and force .Therefore ,
[tex]\rm\longrightarrow Work = (4N)(2m)(cos\theta) [/tex]
Here the angle between the displacement and force is 90° , and value of cos90° is 0 , therefore,
[tex]\rm\longrightarrow Work = 8N-m (0)\\[/tex]
[tex]\rm\longrightarrow \underline{\boxed{\rm\blue{Work = 0 }}}[/tex]
The work done by the weight of the box is zero. The correct answer is zero. The correct option is (E).
Given:
Weight of the box = 4.00 N (acting downward)
Distance = 2.00 m
The angle between force and displacement, θ = 90°
Using the formula for work:
Work (W) = Force × Distance × cos(θ)
Since the angle θ is 90 degrees and cos(90 degrees) = 0.
The work done by the weight of the box is:
W = Force × Distance × cos(90)
W = 4.00 × 2.00 × 0
W = 0 J
Therefore, the work done by the weight of the box is zero. The correct option is (E).
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How many feet up high should I be required to wear a harness?
Answer:
About 6 feet or higher is recommended.
Explanation
A pump lifts water into an overhead tank at a height of 12m at a rate of 5kg/s,what is the power in the pump?
Answer:
600 watts
Explanation:
A 5 kg block is placed near the top of a frictionless ramp, which makes an angle of 30o degrees to the horizontal. A distance d = 1.3 m away from the block is an unstretched spring with k = 3 × 103 N/m. The block slides down the ramp and compresses the spring.
Required:
Find the maximum compression of the spring.
The maximum compression of the spring is 0.146 m.
Work Energy theorem
The work done by the block when it slides down the ramp will be converted to elastic potential energy of the spring.
W = U
Fd = U
where;
F is the horizontal component of the block weightmgsin(θ) x d = ¹/₂kA²
[tex]A^2 = \frac{2mg sin(\theta)d}{k} \\\\A = \sqrt{\frac{2mg sin(\theta)d}{k}} \\\\A = \sqrt{\frac{2(5 \times 9.8) sin(30)\times 1.3}{3\times 10^3}}\\\\A = 0.146 \ m[/tex]
Thus, the maximum compression of the spring is 0.146 m.
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2. An object’s velocity is measured to be v (t) = αt−βt2, where α = 4.00 m/s2 and β = 2.00 m/s3. Calculate the average acceleration of the object from t = 0.0 s to t = 3.0 s
Hi there!
Given the values for α and β, we can plug these into the given equation:
[tex]v(t) = 4t - 2t^2[/tex]
Begin by solving for the velocity at t = 0 and t = 3:
At t = 0:
[tex]v(0) = 4(0) - 2(0^2) = 0 \frac{m}{s}[/tex]
At t = 3:
[tex]v(3) = 4(3) - 2(3^2) = 12 - 18 = -6 \frac{m}{s}[/tex]
Acceleration is the SLOPE of the velocity graph (its derivative), so we can use the kinematic equation:
[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]
Plug in the knowns:
[tex]a = \frac{-6-0}{3 - 0} = \boxed{-2 \frac{m}{s^2}}[/tex]
A 2kg mass is at a height of 3m. What is its gravitational potential energy(use g=10)
Answer:
potential difference
= m × g × h
= ( 2 × 10 × 3 )
= 60 Joules
Answer:
PE = 60 J
Explanation:
Where:
PEg or PE = gravitational potential energy
m = mass of an object
g = acceleration due to gravity
h = height of the object
brnaliest
In a Capacitor of 0.000031 F. a charge of 0.000022 C. exists between the plates.If the separation is 0.7 mm, What is the electric field?
Answer:
1014 V/m
Explanation:
C = 0.000031 F. Q = 0.000022 C, d = 0.7 mm,
V = Q/C = 0.000022/0.000031 = 0.7097 V
E = V/d = 0.7097/0.0007 = 1014 V/m
A baseball with mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time?
Answer Choices:
−2.8 m/s2
−9.8 m/s2
−12.6 m/s2
−7.0 m/s2
Answer:
It is -7.0 m/s2
Explanation:
Just did it
A baseball of mass 0.145 kg is thrown with the force of 0.4 N then the acceleration of the baseball will be equal to 2.8 m/s².
What is acceleration?The rate of change in an object's velocity concerning time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.
Since acceleration has both a magnitude and a direction, it is a vector quantity. Velocity is a vector quantity as well. The definition of acceleration is the change in velocity vector over a time interval divided by the time interval.
As per the instructions given in the question,
Force, f = 0.4 N
Mass, m = 0.145 kg
F = ma
a = f/m
a = 0.4/0.145
a = 2.8 m/s².
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A heavy liquid with a density 13 g/cm3
is
poured into a U-tube as shown in the lefthand figure below. The left-hand arm of the
tube has a cross-sectional area of 9.55 cm2
,
and the right-hand arm has a cross-sectional
area of 6.08 cm2
. A quantity of 90.8 g of a
light liquid with a density 0.86 g/cm3
is then
poured into the right-hand arm as shown in
the right-hand figure below.
h1
h2
9.55 cm2
6.08 cm2
heavy liquid
13 g/cm3
L
9.55 cm2
6.08 cm2
light liquid
0.86 g/cm3
Determine the height L of the light liquid
in the column in the right arm of the U-tube,
as shown in the second figure above.
Answer in units of cm.
Part 2
Find the pressure on the window.
Answer in units of N/m
Based on the data provided;
the height of the liquid, L is 17.2 cmthe pressure on the window is 1449.616 N/mWhat is the formula for density?The formula for calculating density is given as:
Density = mass/volumeFrom the formula above;
mass = density × volume
also, volume = area × height
Therefore,
mass = density × area × height
height = mass / (density × area)Calculating for the height of the liquid:
Height, L = 90.8 / (0.86 × 6.08)
L = 17.2 cm
What is pressure due to a liquid?The pressure due to a liquid is calculated using the formula below:
Pressure = hpgwhere;
h is height = 17.2 cm = 0.172 m
P is density = 0.86 g/cm^3 = 860 kg/m^3
g is acceleration due to gravity = 9.8 m/s^2
Pressure = 860 kg/m^3 × 0.172 m × 9.8 m/s^2
Pressure = 1449.616 N/m
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How much force is needed to pull a spring with a spring constant of 20 N/m a distance of 25 cm?
9 А
3) A 5kg object is to be given an upward
acceleration of
of 0.3 m/s by a rope pulling
straight upward on it, what must be the
tension on the
the rope ?
Explanation:
9 А
3) A 5kg object is to be given an upward
acceleration of
of 0.3 m/s by a rope pulling
straight upward on it, what must be the
tension on the
the rope ?
Select all statements that are true.
Sound waves travel faster in water than in air.
Sound waves travel faster in air than in water.
Sound waves travel fastest through solids.
Sound waves travel slowest through liquids.
Electric wires in between the poles are seen stretched in winter. Give Reason?
Electric wires/cables expand when temperature rises l
a computer printer has a width of 18in. What is it’s width
Answer:
0.46 m. hope this helps.
Answer:
0.46 Meters
Explanation:
A 288-gram cart starts from rest and rolls down an inclined plane from a height of 1.226 m. Determine its speed (in m/s) at a height of 0.126 m above the bottom of the incline. Assume friction is negligible
The law of conservation energy
PE₁ + KE₁ = PE₂ + KE₂
From rest ⇒ v₁ = 0 ⇒ KE₁ = 0
Input the value:
PE₁ = PE₂ + KE₂
[tex]\tt mgh_1=mgh_2+\dfrac{1}{2}mv_2^2\rightarrow divide\:m\\\\gh_1=gh_2+\dfrac{1}{2}v_2^2\\\\9.8(1.226-0.126)=\dfrac{1}{2}v_2^2\\\\v_2=4.64\:m/s[/tex]