Answer:
1b. 9.51 s
1c. 93.18 m/s.
Explanation:
1a. From the question given above, the following data were obtained:
Initial velocity (u) = 0 m/s
Height (h) = 443 m
Acceleration due to gravity (g) = 9.8 m/s²
1b. Determination of the time it takes for the penny to get to the ground.
Height (h) = 443 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
443 = ½ × 9.8 × t²
443 = 4.9 × t²
Divide both side by 4.9
t² = 443/4.9
Take the square root of both side
t = √(443/4.9)
t = 9.51 s
1c. Determination of the speed of the penny before it hits the ground.
Initial velocity (u) = 0 m/s
Height (h) = 443 m
Acceleration due to gravity (g) = 9.8 m/s²
Final velocity (v) =.?
v² = u² + 2gh
v² = 0² + 2 × 9.8 × 443
v² = 0 + 8682.8
v² = 8682.8
Take the square root of both side
v = √8682.8
v = 93.18 m/s
What is the frequency of this wave?
O 1
)2.
O 3
o 4
Answer:
The frequency, represented by the Greek letter nu (ν), is the number of waves that pass a certain point in a specified amount of time. Typically, frequency is measured in units of cycles per second or waves per second. One wave per second is also called a Hertz (Hz) and in SI units is a reciprocal second (s−1).
You are moving a box across the floor with constant force of 50 N, the friction between the box and the floor is 20 N. After moving the box a distance of 10 m, what are: (a) net work done on the box. (b) your work done on the box. (c) work done by the friction? * 0 points
Answer:
(a) net work done on the box 300 J
(b) your work done on the box 500 J
(c) work done by the friction 200 J
Explanation:
Given;
applied force on the box, f = 50 N
frictional force between the box and the floor, fk = 20 N
distance you moved box, d = 10 m
(b) Work done on the box as a result of the applied force;
W = F x d
W = 50 x 10 = 500 J
(c) Work done against the box by friction;
Wk = 20 x 10 = 200 J
(a) net work on the box;
∑W = W - Wk
∑W = 500 J - 200 J
∑W = 300 J
Which shows the correct pathway for nitrification? A. Ammonium Æ Nitrite Æ Nitrate B. Ammonia Æ Nitrite Æ Nitrate C. Ammonia Æ Nitrate Æ Nitrite D. Both A and
Answer:
Both Option A and B.
Explanation:
Both Option A and B are correct because Nitrification is the process whereby ammonium or ammonia is oxidized by ammonia oxidizing bacteria or nitrosofying bacteria like nitrosomonas, niitrosococcus into nitrite and also the process whereby nitrite is oxidized to nitrate by nitibacter bacteria
3. An object accelerates from rest, with a constant acceleration of 4.5 m/s, what will its
velocity be after 30 s?
An object accelerates from the rest, which means that the initial speed of the object is 0 m/s, so the final velocity after 30 seconds will be equal to 135 m/s.
What is acceleration?Acceleration refers to the rate of change in both speed and direction of velocity over time. When something moves slower or faster in a straight line, it is said to have been accelerated. So because direction is always shifting, motion on a circular accelerates even while the speed is constant. Both factors add to the acceleration for every other types of motion.
It is a vector quantity, since acceleration has a magnitude and a direction. Another vector quantity is velocity. The velocity vector change during a certain period of time, split by that period of time, is the concept of acceleration.
The given information in the question is,
Initial speed, u = 0 m/s
Time, t = 30 s
Acceleration, a = 4.5 m/s²
Use the equation of motion,
v = u + at
v = 0 + (4.5)(30)
v = 135 m/s
Therefore, the final velocity of the object will be 135 m/s.
To know more about acceleration:
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PLEASE help me with 1-8 !!
On Earth, a scale shows that you weigh 360 N. What is your mass?
Answer:
36.7097837 kilograms-force
Explanation:
:3 Ight byez
How is ice more reflective than water?
Answer:
In fact, ice is slightly less reflective than water. The reflectivity is related to the refractive index (in a rather complicated way) and the refractive index of ice is 1.31 while the refractive index of water is 1.33. The slightly lower refractive index of ice will cause a slightly lower reflectivity. In both cases, the reflectivity is about 0.05 i.e. at an air/water or air/ice surface about 5% of the light is reflected.
Explanation:
Answer:
In fact ice is slightly less reflective than water. ... The net result is that much more of the light is reflected from snow. So the difference isn't anything fundamental, it's just because water is continuous while snow isn't.
hope it will help u
plz follow me
PLZ HELP IM SO CONFUSED
Answer:
convection
Explanation:
I'm right ya know
Answer:
I don't have an answer but your so pretty I'm jelly lol
A tire is dragged behind a NON LIVING truck on the ground with a chain attached to the tire and the truck. what type of force is this?
Answer:
Kinetic Energy
Explanation:
If your talking about potential and kinetic energy then here's a example,
A hammer when raised up has potential energy (the energy of position or state) But when falling down has kinetic energy (the energy of motion)
You're taking your first dive in ALVIN (Fig 10.13) to witness a hot spot on the ocean floor. As you descend and arrive on site, what are your first impressions?
Answer:
Explanation:
The experience is magnanimous and wonderful when witnessing the hotspot site. It was a great feeling! I could witness the red hot lava oozing out to the ocean floor from the subsurface like water from a hot-spring, and immediately, a cooling effect occurs. At that current time, the gas was coming up in the form of gas bubbles. I believed there was a mini-volcano located inside the ocean! The scene was fascinating, just like inserting a red-hot metallic-iron ball into the cool water, thereby creating a fizzing of gas and the ball's immediate cooling. It was a remarkable experience of witnessing an underwater volcano with the erupting lava and its immediate cooling to form a solid material.
In the “Little Prince,” the Prince visits a small asteroid called B612. If the asteroid has a radius of 20.0 m and a mass of 2.00 x 10^4kg, what is the acceleration due to gravity on the asteroid (G=6.67x10-11N m2/kg2)?
Answer:
[tex]g= 3.33\times 10^{-9}\ m/s^2[/tex]
Explanation:
Given that,
The mas of asteroid is [tex]2\times 10^4\ kg[/tex]
The radius of asteroid is 20 m
We need to find the acceleration due to gravity on the asteroid. The formula for this is given by :
[tex]g=\dfrac{GM}{r^2}[/tex]
Where G is universal gravitational constant
[tex]g=\dfrac{6.67\times 10^{-11}\times 2\times 10^4}{(20)^2}\\\\g=3.33\times 10^{-9}\ m/s^2[/tex]
So, the acceleration due to gravity on the asteroid is [tex]3.33\times 10^{-9}\ m/s^2[/tex].
A student in Europe performs the same experiment, but the AC frequency there is 50 Hz. How different length of sensitized tape will he need in order to get 25 spark marks, compared to the length of your tape for the same number of marks? Give the result in centimeters.
Answer and Explanation:
The computation is shown below:
The ac frequency in the United States is 60 Hz
The ac frequency in Europe is 50 Hz
So,
Time for 25 spark in United stated is 25 ÷ 60 s
Time for 25 spark in Europe is 25 ÷ 50 s
Now
Tape length in United States is
= 0.5 × 9.8 × (25 ÷ 60)^2
= 0.85 m
= 85 cm
And,
Tape length in europe is
= 0.5 × 9.8 × (25 ÷ 50)^2
= 1.225 m
= 122.5 cm
So, As it can be seen that
= 122.5 cm - 85 cm
= 37.5 cm
Europe has 37.5 cm more than in the United States
How many temporal lobes are located in the brain?
Answer:
There's 1 temporal lobe that's located in the brain.
Explanation:
Answer: There are 4 lobes in the brain
Explanation:
The gravitational force between two objects is F. If the mass of one of the two objects is tripled but nothing else has changed, what would the new force be in terms of F
A)F/9
B)6F
C)3F
D)F/3
Answer:
3F
Explanation:
Gravitational Force is directly proportional to the mass; thus if one mass is tripled then the force is triples as well.
Please help, this has to do with kinematic equations
A body moving with uniform acceleration has a velocity of 15.9 cm/s when its x coordinate is 4.26 cm.
If its x coordinate 2.62 s later is −3.18 cm, what is the x-component of its acceleration?
Answer in units of cm/s²
Answer:
[tex]a=-14.3\ cm/s^2[/tex]
Explanation:
Given that,
Initial velocity of a body, u = 15.9 m/s
Initial position, [tex]x_i=4.26\ cm=0.0426\ m[/tex]
Final position, [tex]x_f=-3.18\ cm=-0.0318\ m[/tex]
Time, t = 2.62 s
We need to find the x-component of its acceleration. using second equation of motion to find it as follows :
[tex]x_f-x_i=ut+\dfrac{1}{2}at^2[/tex]
Putting all the values to find a.
[tex]-3.18-4.26=15.9(2.62)+\dfrac{1}{2}a(2.62)^2\\\\-49.098=3.4322a\\\\a=-14.3\ cm/s^2[/tex]
So, the acceleration of a body is [tex]-14.3\ cm/s^2[/tex].
Silver is a white metal that is an excellent conductor. Silver tarnishes when exposed to air and light. The density of silver is 10.49 g/cm3. The melting point is 962oC and the boiling point is 2000oC. A chemical property of silver is A) density. B) melting point. C) tarnishes in air. D) that it is a conductor.
Answer:
C) tarnishes in air.
Explanation:
Silver is a white metal that tarnishes when it is exposed to air that has the presence of sulphur gases. When exposed, it begins to undergo discoloration. It starts to darken as a result of the reaction with the gases causing the silver object to be disfigured. The commonest sulphur containing gas is hydrogen sulfide. As relative humidity goes up, silver can also tarnish faster.
how many electrons would be in an atom of carbon that has six protons and six neutrons?
Distance vs. Time
80
70
60
B
50
Distance (m)
40
А
30
20
10
10 20
30 40 50
Time (s)
60
70
80
1. How far has the student walked in 25 seconds?
2. Describe the motion of the student from 25 seconds to 60 seconds.
3. How long did it take the student to walk 40 meters?
4. What is the independent variable?
5. What is the dependent variable?
Answer:
1. 50m
2. they are motionless
3. 20s
4. time
5. distance
Which of the following most likely describes a Group 10 element?
O Good conductor of heat
O Gas at room temperature
O A member of the carbon group
O Poor conductor of electricity
Answer:
A. Good conductor of heat
Explanation:
The group 10 elements are a group of chemical elements as part of VIII elements and they include nickel, platinum, palladium etc. These group of chemical elements are all d-block transition metals, highly ductile and lustrous and are mostly white to light grey in color.
The statement which most likely describes a Group 10 element is that they are good conductor of heat because they have some of the chemical and physical properties of metals.
___________ force is a supportive force that surfaces exert in order to prevent solid objects from passing through one another.
A. Contact
B. Regular
C. Normal
D. Field
A stone is projected vertically upwards with a velocity of 12ms'. Calculate or find:
a) How long it took the stone to reach its maximum height.
b) Maximum height reached by the stone.
Answer:
The acceleration of the stone will be -9.8 m/s^2, because of the acceleration of earth's gravity, the initial velocity will be 12 m/s, and the final velocity will be 0 m/s. Therefore, we can solve using a kinematic equation to solve the problems:
a)
Final Velocity = Initial Velocity + Acceleration * Time
0 = 12 + -9.8*t
-12 = -9.8*t
t = 12/9.8 ≈ 1.224
Therefore, the time is equal to 12/9.8 ≈ 1.2245 seconds.
b)
Displacement = (Initial Velocity + Final Velocity)/2 * Time
d = (12+0)/2*1.2245
d = 6*1.2245
d = 7.347
Therefore, the maximum height is approximately equal to 7.347 meters.
Which shows the correct order of forces, from weakest to strongest?
o weak, strong, gravitational, electromagnetic
O electromagnetic, weak, strong, gravitational
O gravitational, weak, electromagnetic, strong
O weak, electromagnetic, gravitational, strong
Answer:Helle dudes
Explanation:
im the Batman
Answer: C. gravitational, weak, electromagnetic, strong
Explanation:
Got it right!!
URGENT! Why are vectors important to the concept of relative velocity?
Answer:
Explanation:
In physics, vectors are useful because they can visually represent position, displacement, velocity and acceleration. When drawing vectors, you often do not have enough space to draw them to the scale they are representing, so it is important to denote somewhere what scale they are being drawn at.
Local winds and global winds are generally a result of which of the following?
O Earth's tilted axis.
O Unpredictable changes in the atmosphere.
O Variations in the energy received from the sun.
O Unequal heating of Earth's surface.
Answer: Unequal heating of Earth's surface
Explanation:
A blue car is traveling at a rate of 20 m/s. A red car is traveling at a rate of 40 m/s. The cars have equal masses.
Compare the kinetic energy of the two cars.
The maximum kinetic energy of photoelectrons does not depend on
Answer:
intensity
Explanation:
When a photoelectric effect is observed, the number of electrons ejected is proportional to the intensity of the incident light. However, the maximum kinetic energy (KEMAX) of the photoelectrons is independent of the light intensity.
Use the clues provided to fill in the blanks. NOT ALL OF THE WORDS IN THE WORD BANK WILL BE USED!!
Also don't mind the numbers that are in the blanks...
You just need to fill in the blanks using the words provided in the word bank.
Thank you.
Is the speed of water molecules different in hot
and cold water?
What specific object do you think of when you hear "an object in motion"?
(Example: I think of a soccer ball on a soccer field!)
Answer:
I think of somone throwing a ball or a ball rolling off of a table.
Explanation:
A 75.0 kg man is standing at rest on ice while holding a 4.00kg ball. If the man throws the ball at a velocity of 3.50m/s forward what will his resulting velocity be
Explanation
According to law of conservation of momentum
m1u1 + m2u2 = (m1+m2)v
m1 is mass of the man 75kg
u1 is the velocity of the man 0m/s
m2 is the mass of the ball = 4kg
u2 is the velocity of the ball = 3.5m/s
We are to find v
Substitute
75(0)+4(3.5) = (75+4)v
0 + 14 = 79v
v = 14/79
v = 0.177m/s
Hence his resulting velocity will be 0.177m/s