Answer:
D. The primary source, because it was written by the researcher
Explanation:
One should learn to trust the primary source more because it is the real work of the researcher.
A primary work defines the work of research from his or her experimental findings.
The primary source presents experimental data and other subordinates ones to reach a conclusion as seen from the view of the researcher. A secondary source implies someone else documenting their own opinion about the primary experimental set up. This can get dicey in the sense that results can be twisted to serve other ulterior motives.an object is dropped from the top of a building which is 75 meters high. what's it's velocity before it reaches ground
Hi there! :)
[tex]\large\boxed{38.34 m/s}[/tex]
Use the following kinematic equation to solve:
[tex]v_{f}^{2} = v_{i}^{2} + 2ad[/tex]
Where:
vf = final velocity (?)
vi = initial velocity (0 m/s, object started at rest)
a = acceleration (gravity = 9.8 m/s)
d = distance travelled (75 m)
Plug in the given values into the equation:
[tex]v_{f}^{2} = 0^{2} + 2(9.8)(75)[/tex]
Simplify:
[tex]v_{f}^{2} = 2(9.8)(75)\\\\v_{f}^{2} = 1470[/tex]
Take the square root of both sides:
[tex]v_{f} = \sqrt{1470} = 38.34 m/s[/tex]
A bullet is fired in a horizontal direction with a muzzle velocity of 300m/s.In the absence of air resistance,how far will it have droppped in travelling a horizontal distance of how far it will drop one one second
Answer:
304.9m
Explanation:
Given
Velocity = 300m/s
Tim = 1sec
Required
Horizontal distance S
Using the formula
S= ut+1/2gt²
S = 300(1)+1/2(9.8)(1)²
S = 300+4.9
S = 304.9m
Hence the distance travelled is 304.9m
A wooden plank rests in equilibrium on two rocks on opposite sides of a narrow
stream. Three forces P, Q and Ract on the plank.
P
RA
plank
Q
How are the sizes of the forces related?
AP+ Q = R
BP+R =
CP= Q = R
DP= Q +R
Answer: P+R = Q
Explanation: upward forces = downward forces
A mysterious box-shaped object is found on your front porch. It is 36 cm
long, 24 cm wide, and 12 cm tall. It has a mass of 104 g. What is the density of this
box-shaped object?
Answer:
p=0.01g/cm³
Explanation:
Lets find the volume
Length+Width+Height
36×24×12=10,368cm³
mass is 104g
Formula of finding density is
p=m/v
Lets substitute the known variables
p=104g/10368cm³
p=0.01g/cm³
a 950 N skydiver jumps from an altitude of 3000 m. What is the total work performed on the skydiver?
Answer:
2850000J
Explanation:
Given parameters:
Weight of diver = 950N
Altitude = 3000N
Unknown:
Total work done by the sky diver = ?
Solution:
To solve this problem, we use the expression:
Work done = Weight x height
Now insert the parameters:
Work done = 950 x 3000 = 2850000J
Which is an example of a solution?
OA.
flour and water
B.
sand and water
C.
salt and water
D.
oil and water
E.
ice and water
Answer:
C
Explanation:
plato
Answer:
c. Salt and Water
Explanation:
You must always include a direction when recording an amount of energy. Is this true?
2
1 point
What is the relationship between wavelength and frequency in the electromagnetic spectrum?
As wavelength increases, frequency will decrease.
As wavelength decreases, frequency will decrease.
There is no relationship between wavelength and frequency,
1
2
As wavelength increases, frequency will increase.
Humans landed on moon for the first time in 1969. Which of these statements best
explains why humans should continue to send manned missions to moon?
A. They prove all current facts about moon incorrect.
B. They supress cold war between different countries.
C. They help discard some myths about moon.
D. They increase human resistance to extreme conditions.
thanks so much y’all <3
Answer:
D
Explanation:
Giving brainliest to whoever can solve!! Light of wavelength 675 nm passes through a double slit , and makes its first minimum (m = 1) at an angle of 0.111 deg. What is the separation of the slits , d , in MILLIMETERS ?
Answer:
0.174
Explanation:
Using the equation with both the minimum and where you're solving for d, (1-1/2) 675/sin(0.111), you get 174210.2 so you convert that into millimeters by moving the decimal point up 6 (the difference of nm 10^-9 and millimeters 10^-3),leaving you with 0.174.
I hope this helped!
Answer: 0.174
Explanation:
what is a similarity between air pressure and temperature in the troposphere
Answer:
The temperatures
Explanation:
Heat rises
Find the slope of the line that passes through the points (-1, 3) and (2, -5)-
Answer:
m=−8/3
Explanation:
Answer:
-8/3
Explanation:
Slope m= y2-y1/ x2- x1
Describe reflection using the terms incident ray and reflected ray.
10 points fast
10 POINTS ASAP
Answer:
The normal line divides the angle between the incident ray and the reflected ray into two equal angles. ... The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection
The law of reflection is the idea that when light rays strike a smooth surface, the angle of incidence and the angle of reflection are both identical. Additionally, the incident ray, the reflected ray, and the surface normal all reside in the same plane.
What is reflection?Reflection of light refers to the act of light rays hitting a surface and reflecting back.
According to the law of reflection, the angle of the reflected ray, when reflecting from a smooth surface, is equal to the angle of the incident ray, with regard to the surface's normal, which is a line perpendicular to the surface at the point of contact.At the point of contact of the incident ray, the reflected ray is always in the plane defined by the incident ray and the normal to the surface.The law of reflection explains how both curved and planar mirrors form images.
Learn more about reflection here:
https://brainly.com/question/28969632
#SPJ2
PLEASE HELP WILL MARK AND 5 STARS I AM TIMED!!!!!!!!1
Answer:
is there a better picture
A wave has a speed of 65 m/s and a frequency of 13 Hz. What is the wavelength of
this wave in metres?
Answer:
Explanation:
Velocity or speed (v) = 65 m/s
Frequency (F) = 13 Hz
Wavelength (λ) = ?
We know
V = λ * f
65 = λ * 13
λ = 65 / 13
Therefore Wavelength (λ) = 5 meters
Hope it will help :)
The wavelength of the wave is 5 m.
The given parameters;
velocity of the wave, v = 65 m/s
frequency of the wave, f = 13 Hz
The wavelength of the wave is calculated as follows;
v = fλ
where;
λ is the wavelength of the waveThe wavelength of the wave is calculated by substituting the given parameters;
[tex]\lambda = \frac{v}{f} \\\\\lambda = \frac{65}{13} \\\\\lambda = 5 \ m[/tex]
Thus, the wavelength of the wave is 5 m.
Learn more here: https://brainly.com/question/4386945
Which number sentence is true? *
376,425 >367,419
337,425 >337,524
336,425 <335,426
327,425<327,416
Answer:
first one
Explanation:
376,425 is the biggest number in general
Answer:
the first line is true whuch is 376425>367419
a truck is moving at a constant speed of 46m/s. What is its acceleration?
Answer:
the distance from point C to D is 7.75m
Explanation:
A wave with a wavelength of 125 meters is moving at a speed of 20 m/s. What is it’s frequency
Answer:
0.16Hz
Explanation:
wavelength (λ) = 125 meters
speed (V) = 20 m/s
frequency (F) = ?
Recall that frequency is the number of cycles the wave complete in one
second. And its value depends on the wavelength and speed of the wave.
So, apply the formula V = F λ
Make F the subject formula
F = V / λ
F = 20 m/s / 125 meters
F = 0.16 Hz
8. Energy travels in what direction?
9. Draw how the amplitude is measured.
0.000000004004584 can be written as?
Answer:
40 229/5000
Explanation:
</3 PureBeauty
Answer:
0.000000004004584
Explanation:
1. When an object is not in motion, what is the sum of the forces acting upon that object?
2. How can forces cause an object to move, change direction, or stop?
3. In a baseball game, a batter is determined to hit a home run. Describe the motion needed from the batter to achieve this goal.
Answers needed ASAP, class in 30 minutes.
Answer:
Net external force is the sum of all of the forcing acting on an object. Just because there are forces acting on an object doesn't necessarily mean that there is a net external force; forces that are equal in magnitude but acting in opposite directions can cancel one another out.
Explanation:
Answer:
Kk so your answers are: 1 is The sum of all the forces acting on an object is the net force or resultant force. If all the forces cancel out, the resultant force is zero, else, the unbalanced force will cause acceleration of the object. Force is a vector and hence has both a direction and magnitude. 2 is Depending on the magnitude and direction of the force, it can cause an object to move, stop or change direction. For example, in baseball a pitcher throws the ball with a certain speed towards the hitter, who hits it, thus applying a force to it. and 3 is friction.
Explanation:
Make sure to mark as brainliest, and a tip: Try to reword these so its not copy and pasting from the internet!
Select the correct answer. How many sets make up a game in volleyball? ОА. Two OB. Three or Five Ос. Four or Six OD One
5 sets
Explanation:
Matches are played best of five sets. The first four sets are played to 25 points, with the final set being played to 15 points. A team must win a set by two points. There is no ceiling, so a set continues until one of the teams gains a two-point advantage. Previously, all sets were to 15 points, with the first four sets having a ceiling of 17 and the final set requiring at least a two-point winning advantage.
can somebody help me with this please ?
Answer:
Speed = Distance by Time
so, 105/5
= 21 km/hr
Explanation:
hope it helps....
Determine the number of turns of the primary winding of a transformer connected to a voltage of 380 V, if the number of turns of the secondary winding is 200 and the output voltage is 19 V.
Answer:
4000 turns
Explanation:
The formula to apply is ;
Voltage in secondary coil/ Voltage in primary coil = Turns on secondary coil/Turns in primary coil
Vs/Vp =Ns/Np
Given that;
Ns=200
Vp=380 V
Vs=19 V
Applying the formula as;
Vs/Vp = Ns/Np
19/380 = 200/Np
1/20 =200/Np
Np = 200/0.05
Np= 4000 turns
An object weighs 100 newtons on earth.What is its weight on the moon?
Answer:
a) The gravitational acceleration at the surface of the Moon is g moon=1.67 m/s
2
The ratio of weights (for a given mass ) is the ratio of g-values, so
W
moon
=(100N)(1.67/9.8)=17N.
(b) For the force on that object caused by Earth's gravity to equal 17 N, then the free fall acceleration at its location must be
ag
=1.67m/s
2
. Thus , .
ag
= r 2
Gm
E
⇒
a
g
Gm
=1.5×10
7
m
So the object would need to be a distance of r/R
E
=2.4 "radii" from Earth's center.
Answer:
20 N
Explanation:
Consider that earth's acceleration due to gravity is approximately 9.81 m/s^2. Also consider that the moon's acceleration due to gravity is about 1.62 m/s^2. Using these two values, we can easily find the weight of the object on the moon, given that the object weighs 100 N, and that F = ma.
First, let's break it up.
100/9.81 =
10.193679918450561 kg
10.193679918450561*1.62 =
16.513761467889908 N
≈ 20 N (with one significant digit, since that is the least amount of sig figs in the problem)
Which type of electromagnetic wave has more energy than ultraviolet waves
have?
O A. Visible light
B. Infrared
O C. X-rays
O D. Microwaves
Answer: C. X-Rays
Explanation:
Answer:
C I am pretty sure
Explanation:
Image below
I just need to know if I am correct. thanks!
what are the two key guides to drawing a circuit diagram
Answer:
1) The diagram is drawn with a ruler and a pencil. Always begin by tracing its general shape that is a rectangle. - 2) The standard symbols of the different electric components are located, preferably, in the middle of each side.Jan
Explanation:
When a ringing bell is caught with hands the sound ceases why
A 0.5 kg mass moving East with a velocity of 8 m/s is acted upon by a force of 20 N for 2.0 sec.
a) What is the initial momentum of the mass?
b) What impulse was given to the mass?
c) What is the final momentum of the mass?
d) What is the final velocity of the mass?
Answer:b
Explanation: