how to make a brainliest questions Or how to Get them?
Answer:
Select the crown at the bottom of an answer where the speech bubble icon is.
Which describe the image formed by the convex
mirror? Check all that apply.
-real
-virtual
-inverted
-upright
-smaller
-larger
Answer:
- Virtual
- Upright
- Smaller
Explanation:
I just did it on Edg22 and I got it correct :D
Answer:
see the picture
Explanation:
a toy airplane takes off and flies for a distance of 34 meters at an angle of 26 degrees above the horizontal. what is its altitude when it has flown this distance?
Answer:
Explanation:
14.9m
The altitude when the airplane flies a distance of 34 m is equal to 14.9 m.
What is the distance?The distance of an object can be demonstrated as the total length traveled by an object. The distance can be defined as a scalar parameter as it has magnitude, not direction. The distance by an object is always positive (+ve), it can never be zero.
Given, the airplane traveled the distance, BC = 34m as shown in the attached diagram, below:
The angle of the path with horizontal, θ = 26°
From the right angle triangle ΔCBA, we can calculate the BC:
Sin θ = BC/AC
Sin 26° = x/34
x = sin 26° ×34
x = 0.438 × 34
x = 14.9 m
Therefore, the altitude when an airplane has flown this distance is 14.9 m.
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What is the appropriate distance for social space?.
Answer:
Social distance ranges from 4 to 8 feet (1.2 m - 2.4 m) away from the person and is reserved for strangers, newly formed groups, and new acquaintances. Neuropsychology describes personal space in terms of the kinds of 'near-ness' to the body. 1.
A disk with radius of 0. 5 m is free to rotate around its center without friction. A string wrapped around the disk is pulled, as shown above, exerting a 2 n force tangent to the edge of the disk for 1 s. If the disk starts from rest, what is its angular speed after 1 s?.
For a disk with radius of 0. 5 m is free to rotate around its center without friction, its angular speed after 1 s is mathematically given as
w=1/(0.5M π^2)
What is its angular speed after 1 s?Generally, the equation for the Moment of inertia is mathematically given as
I=0.5mx^2
Where
radius = 0. 5 m
Mass=M
Force on edge=F=2N
Time =t
Hence, Torque
T=0.5*2=1.0Nm
Where
T=Ia
w=W0+at
Hence
W=1/I
In conclusion, angular speed after 1 s
I=0.5M π^2
w=1/(0.5M π^2)
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A weightlifter holds a barbell motionless at her chest as she prepares to lift it over her head. The work done by the weightlifter to hold the barbell in this position is
Answer:
it's a bit of a trick question
Explanation:
W = distance X force
when the distance is zero, the work is zero. So when she holds the weight without moving them she is doing no work. But, to be fair, that's just the wording, what "work" means. she is actually producing a force, that is equal to the weight of the barbells, to hold them against the graviational force.
A footballer kicks a football of mass 430 g and it flies off at a speed of 8 m/s. What is the KE of the football?
Answer:
13.76 Joules
Explanation:
The SI units for joules are defined to be kilogram*meters per second. Therefore, we must turn the grams to kilograms by dividing the answer by 1,000. This is due to 1,000 grams being in a single kilogram. Kinetic energy is defined to be:
[tex]KE=\frac{1}{2} mv^2[/tex]
Therefore:
[tex]KE=\frac{1}{2} (0.43kg)(8m/s)^2=13.76J[/tex]
What would be the final velocity, in m/s, if a disk of the same mass and radius as the hoop rolled down the hill?.
The final velocity will be [tex]\rm V= \sqrt{\frac{4gh}{3} }\ m/sec[/tex]. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.
What is velocity?The change of distance with respect to time is defined as speed.
From the law of conservation of energy:
[tex]\rm KE_i + PE_i = KE_f+PE_f \\\\ 0+mgh = \frac{1}{2} mV^2 +\frac{1}{2} I\omega^2[/tex]
The moment of inertia of the disc;
[tex]\rm I= mr^2[/tex]
It can also be found as;
[tex]\rm I = \frac{V}{r} \\\\[/tex]
Put the obtained values;
[tex]mgh = \frac{1}{2} mv^2+\frac{1}{2} mv^2=mv^2\\\\ mgh = mv^2 \\\\ v=\sqrt{gh}[/tex]
if a disk of the same mass and radius as the hoop rolled down the hill;
[tex]mgh= \frac{1}{2} M+\frac{mr^2}{2r^2} V^2 \\\\ gh = \frac{3}{4} V^2 \\\\ V= \sqrt{\frac{4gh}{3} }\ m/sec[/tex]
Hence the final velocity will be [tex]\rm V= \sqrt{\frac{4gh}{3} }\ m/sec[/tex].
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Astronomers have discovered pulsars spinning 500 x per second or more. How do astronomers think pulsars got to be spinning so outrageously fast
Astronomers think pulsars got to be spinning so outrageously fast because of the stars near them, which leave substances on the pulsar.
What is pulsars spinning?Generally, Pulsars are simply defined as fast revolving neutron stars created in supernova explosions, which happen when a huge star dies and bursts.
In conclusion, This burst gives of a large amount of energy.
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When the reflection of an object is seen in a flat mirror, the image is.
Answer:
the image is actually appearing behind the mirror, and not in the mirror.
Which element is more likely to give up electrons than to gain them during a reaction? A.fluorine b.boxygen c.carbon d.lithium
Answer:
Lithium
Explanation:
Elements that are metals are tend to lose electrons and become positively charged ions called Cations. Elements that are non metals tend to gain electron and become negatively charged ions called Anions.
9. As a cold front passes a New York weather station,
which changes will usually be observed in barometric
pressure and air temperature?
A) Pressure rises and temperature falls.
B) Both pressure and temperature rise.
C) Both pressure and temperature fall.
D) Pressure falls and temperature rises.
When the cold front or wind passes weather station, the pressure increases whereas the temperature increases.
What happen when cold front passes a New York weather station?Pressure rises and temperature falls as a cold front passes a New York weather station because wind apply pressure on the objects when they blow. If the wind is cold then the temperature decreases.
So we can conclude that when the cold front or wind passes weather station, the pressure increases whereas the temperature increases.
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Who discovered the surface of venus was noxious and hot?.
The discovery that the surface of Venus is noxious and hot can be attributed to several space missions and scientific observations. However, the first confirmation of Venus's harsh conditions came from the Soviet Venera 4 mission in 1967.
Venera 4, an unmanned spacecraft, successfully descended through Venus's atmosphere and transmitted data back to Earth. The mission's instruments indicated extreme temperatures, atmospheric pressure, and the presence of noxious gases, including sulfuric acid clouds.
This groundbreaking mission provided the initial evidence that Venus has a hostile environment with a thick, toxic atmosphere and intense heat.
Therefore, it was the Soviet Venera 4 mission that played a pivotal role in confirming the noxious and hot nature of Venus's surface.
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Three examples of good hypotheticals
Answer:
here are some of my favorites
Explanation:
if the world was ending, what would you do?
if you had super powers. what would they be?
if we could go to the moon, would you?
Answer:
If Life was a human, how would you treat him/her?If death was a god would you praise him?And If wishes were dead, would you bring them back alive?Explanation:
{horrifically chuckles]
*Leaves the room*
A go-cart is rolling down a hill at 15m/s. If it has 85J of kinetic energy. what is the mass of the go-cart?
0.76kg
0.87kg
5.67kg
0.18kg
The frequency of phenotypes for a typical polygenic trait is most often illustrated as.
Answer:
a bell-shaped curve.
Explanation:
Which formula can be used to solve problems related to the first law of thermodynamics? q = w u q = u – deltaw q = u w q = u – w
"Q = ΔU + W" is the equation is used to solve the questions related to "First law of thermodynamics".
What is the first law of thermodyanamics?"First law of thermodynamics" states that "energy" neither created nor destroyed, but it can transfer from "one form of energy" to "another form of energy".
This "First law of thermodynamics" is also called as "law of conversation of energy". The formula for "First law of thermodynamics" of a system is that "change in internal energy of a system" is same as the difference of "heat energy" flows across the " boundaries of a system" and the "work done" on the system.
ΔU = Q - W
Q = ΔU + W
Where, "ΔU" is "change in internal energy", "Q" is "heat transferred and "W" is "work done.
Hence "Q = ΔU + W" is the equation is used to solve the questions related to "First law of thermodynamics".
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A ray of light passing through centre of curvature of a concave mirror is incident on its reflecting surface. What is the angle of incidence and reflection of this ray of light?
a sound is first produced by making something BLANK the sound then travels through a BLANK to reach the ears, which are the parts of the body that allow for sounds to be heard
Answer:
vibrate, medium.
Explanation:
Edge, 2022.
In straight line path, magnitude of velocity is equal to
Acceleration
Explanation:
The particle is moving in a straight line. That means there’s no change in the path of the particle in the entire trip. It is moving with constant acceleration, meaning the particle doesn’t change its acceleration at all. The acceleration direction is in the same direction of instantaneous velocity
8TH GRADE SCIENCE PLEASE HELPPP
Answer:
The two helicopters have the same kinetic energy, but a different GPE, or gravitational potential energy.
Explanation:
Which space mission visited the moon several times?.
If a star has a large luminosity and also a low surface temperature then it must have:.
Answer:
To summarize, the answer is it has a small radius.
Explanation:
This is becuase these characteristics interpert a small radius.
Which is an example of a negative acceleration? A snowboarder who increases speed when traveling downhill, a biker who maintains a constant speed through a race
Answer:
a snowboarder who increaseds speed when traveling downhill
Explanation:
In the first direct detection of gravitational waves by LIGO in 2015, the waves came from A. the collapse of a nearby star into a white dwarf B. the merger of two black holes C. a supernova explosion in a nearby galaxy D. the rapid motion of three hot Jupiter planets around a
In the first direct detection of gravitational waves by LIGO in 2015, the waves came from the merger of two black holes. Option B is correct. This is further explained below.
What are gravitational waves?A gravitational wave is simply defined as a ripple in space that is unseen though extremely rapid. Gravitational waves move at light speed. As they pass past, these waves compress and stretch everything in their path.
In conclusion, the merger of two black holes is the first direct detection of gravitational waves.
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Which circuit has the largest equivalent resistance?.
Why do perpendicular forces do No work?
Answer:
The definition of work is:
Force (dot product) distance = work
The dot product of vectors at right angles is zero - so no work can be done if the applied force is at a right angles to direction of motion
If the height gain of each step was 0.20 m , and the mass of the runner was 69 kg , what was his average power output during the climb
Answer: 370 W
Explanation:
Find the total height
1576 steps * 0.2 metres = 315 m
Energy = mgh = 69 * 9.8 * 315
=2.12 * 10^5 J
Power = energy / time
Time = 9*60 +33 = 573 sec
So power = energy/time = 370 W
find the work done by the engine of a car which moves at an acceleration of 3 m / s2 for 8s. the mass of the car is 1400 kg, while the coefficient of fecundation of its wheels with the road is 0.03.
Explanation:
so that u multiple in this formula
Answer:
362.88 kJExplanation:
Given
a = 3 m/s²t = 8 sm = 1400 kgμ(k) = 0.03Finding Displacement
S = ut + 1/2at²S = 0 + 1/2(3)(8)²S = 32(3) = 96 mFinding Net Force
Applied Force (F) = ma = 1400 x 3 = 4200 NFriction Force (f) = μmg = 0.03 x 1400 x 10 = 420 NNet Force = F - f = 4200 - 420 = 3780 NWork Done
W = FS = 3780 N x 96 mW = 362880 JW = 362.88 kJWhat is the net force that acts on a 5 kg object accelerating at 2m/s
Answer:
10 N
Explanation:
I assume there is no friction and we are only worrying about the horizontal direction. If so we use the formula F=MA to get F= 2 * 5 = 10 N