Answer:
Many of planet earth's water pollution crises are due to the use of items that are not degradable biologically;Her address to the United Nations said we have to return to the use of degradable materialsThey are currently producing oxo-degradable materialsSweden is the third nation to perfect and implement the total use of bio-degradable plastic bagsPepsi Cola Company was reported to have promised to discontinue the use of bottles that were not degradable biologicallyAdverse weather conditions eventually make every matter degradable. Some just take longer than otherdetergents are degradable.
Cheers
A student walks 3 km in 30 minutes. What is the student's average speed in km/h?
Answer:
6km/hr
Explanation:
3km = 30mins
x(km) = 1hr
1hr = 60 x 60 = 3600secs
30min = 30 x 60 = 1800secs
3 x 3,600/x X 1,800
x = 10,800/1,800
x = 6km/hr
To solve the problem we must know about speed, distance, and time.
What is the relationship between Speed, distance, and Time?
We know that speed, distance, and time all are in a relationship with each other. this relationship can be given as,
[tex]\rm{Speed = \dfrac{Distance}{Time}[/tex]
Given to us
A student walks 3 km in 30 minutes.
We know distance can be written as the product of speed and time, therefore,
[tex]\rm Distance = \rm speed \times \rm Time[/tex]
Substituting the values we get,
[tex]\rm 3\ km = Speed \times 0.5\ hour[/tex]
[tex]\rm speed = \dfrac{3\ km}{0.5\ hour}[/tex]
speed = 15 km\h
Hence, the speed of the student is 15 km\hour.
Learn more about speed, distance, and time:
https://brainly.com/question/15100898
Water raises a boat once every 3.0 seconds. What is the frequency (f) of the waves passing the boat?
3.0 Hz
0.33 Hz
0.1 Hz
334 Hz
Answer:
I think its A
Explanation:
if its every 3 seconds wouldnt it be 3.0 Hz
Ill give brainliest! 1. Which item below describes a quick change to
Earth's landscape?
A. a stone becoming smooth
B. dirt moving down a steep hill
C. flat land becoming a canyon
D. a glacier flattening the land below it
Answer:
hmmmmm
Explanation:
I am gonna say D.
if I am right plz give me a brainliest
The displacement current density between the plates of a parallel-plate capacitor is uniform and has a magnitude of 19.9 A/m2 as the capacitor is being charged. What is dE/dt, the rate at which the electric field strength is changing between the plates
Answer:
[tex]\dfrac{dE}{dt} \approx 2.261 \overline {36} \times 10^{12} \ V/ms[/tex]
Explanation:
The parameters given in the question are;
The magnitude of the displacement current density between the plates of a parallel-plate capacitor, J = 19.9 A/m²
We have;
[tex]i_d = \epsilon _0 \times \dfrac{d \Phi_E}{dt} =\epsilon _0 \times A \times \dfrac{d E}{dt}[/tex]
Therefore;
[tex]\therefore \dfrac{dE}{dt} =\dfrac{i_d}{\epsilon _0 \cdot A} =\dfrac{J}{\epsilon_0} = \dfrac{19.9}{8.8 \times 10^{-12}} \approx 2.261 \overline {36} \times 10^{12}[/tex]
Therefore;
[tex]\therefore \dfrac{dE}{dt} \approx 2.261 \overline {36} \times 10^{12} \ V/ms[/tex]
A 50kg block is at rest on the ground.
(a) Draw a diagram of the block and draw in the forces acting on the block (label these forces)
(b) Determine the magnitude and direction of weight of the block and the normal force acting on the block.
Answer:
(b) 490 N downwards
Explanation:
(b) Formula : w= mg
m is the mass of the object
g is a gravitational constant (9.8)
w= mg
= 50×9.8
= 490 N downwards
Most metallic elements, such as copper
and iron, have high melting points. This
is a useful property because
F. it keeps cars made of metal from
becoming hot on summer days
G. it enables people to use pots and pans
made of metal to cook food
H. it prevents machine parts made of
metal from rusting
J. it makes metals easier to melt so they
can be poured into molds to make
precision tools
Answer:
G. it enables people to use pots and pans made of metal to cook food
Explanation:
Metals are known to be substances with a relative high melting point, which means that it takes a very high temperature to melt them. As used in this question, copper (Cu) and iron (Fe) at metallic elements that have high melting points.
One advantage of this property based on the options provided is that "it enables people to use pots and pans made of metal to cook food". This is because cooking food requires subjecting them to a constant temperature from a heat source e.g cooker or stove.
The material used to hold the food being cooked must possess a very high melting point to withstand the heat, hence, the importance of these metallic substances. Most pots and pans are made of steel, an alloy of iron, hence, they have high melting point.
Identifying Obstacles
Since the purpose of these strategies is to help overcome obstacles and set-backs in your exercise routine, take a minute and think about the most obvious obstacle you have. If you do not have any obstacles at the present time, think about a potential obstacle to your exercise that could occur.
Answer:
Thx!
Explanation:
in each of the following divide the second number by the first number and find the quotient:3/4,-3/8
Answer:
[tex]\dfrac{-1}{2}[/tex]
Explanation:
We need to divide the second number by the first number and the numbers are 3/4,-3/8.
First number = 3/4
Second number = -3/8
Dividing the second number by the first number.
So,
[tex]\dfrac{\dfrac{-3}{8}}{\dfrac{3}{4}}[/tex]
We know that,
[tex]\dfrac{\dfrac{a}{b}}{\dfrac{c}{d}}=\dfrac{a}{b}\times \dfrac{d}{c}[/tex]
So,
[tex]\dfrac{\dfrac{-3}{8}}{\dfrac{3}{4}}=\dfrac{-3}{8}\times \dfrac{4}{3}\\\\=\dfrac{-1}{2}[/tex]
So, the answer is (-1/2)
can u get this right?
Water in a tank which is positioned 5 feet above the ground is _____ potential energy? (answers would be like thermal, electric, mechanical)
Answer:
Mechanical
Explanation:
The tank is at rest. And energy of any substance at rest is known as potential energy.
Now, in forms of energy, potential energy is a type of mechanical energy.
Thus, the correct option is mechanical Energy.
Step 3: Create your graphs. a) Decide how many graphs you will need to show the energy transformation. b) You should have at least 3 graphs, so that the steps of the transformation will be clear. c) Each graph should be clearly labeled. d) Careful use of color on your graphs will make them easy to read and understand. It's for Edge. Project: Energy Transformation Poster. Thank you!
the distance and direction between starting and ending positions
Answer:
The length traveled by an object moving in any direction or even changing direction is called distance. The location of an object in a frame of reference is called position. For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement
Explanation:
good luck
A girl who is watching a plane fly tells her friend that the plane isn't moving at all. Describe a frame of reference in which the girl's description would be true.
The girl's reference frame must be moving with the same speed as the plane.
If an observer is stationary and he watches a car moving he can observe that the car has a momentum and is moving with certain speed. But if the observer is in the car or moving with same speed, the car does not appear to move away form the observer. Likewise, two observers moving with different speed will have different observation about the same car.
Similarly, if the girl describes the plane is not moving that means either she is in the plane or moving with the same speed along with the plane.
Learn more about frame of reference:
https://brainly.com/question/20897534
a horizontal force of 25 newtons eastward causes a 10 kg box to have a displacement of 5m eastward. The total work done by the 25 Newton force is?
Answer:
125 J
Explanation:
Work done = force * distance
work = 25 * 5
work = 125 J
Newton's Third Law of Motion relates to action and reaction. Which of the following
scenarios accurately names the correct action and reaction pair to apply to Newton's
Third Law?
A) An arrow hitting a tree (action) after being launched (reaction)
B)
A car accelerating forward (action) after the driver pushes the acceleration
pedal (reaction)
C) A skateboard moving (action) after being pushed (reaction)
D)
An ax being used to hit wood (action) and the wood splitting after being hit
by the ax (reaction)
Answer:
An ax being used to hit wood (action) and the wood splitting after being hit
by the ax (reaction)
Explanation:
Answer:
d
Explanation:
Kara started a new exercise program. Kara’s sister works out with her on a regular basis and even talks to Kara about her progress. In this scenario, what is another name for Kara’s sister?
A.
goal-setter
B.
self-monitor
C.
support system
D.
nutritionist
As a projectile travels down its trajectory path, it covers _____.
A. more distance each second
B. a distance that depends on how it was dropped
C. the same amount of distance each second
D. less distance each second
Answer:
it is C.
definitely C
Explanation:
if I am right.
plz help me out and give brainliest
- 3000 J of work is done on a 2kg object over a distance of 10m. What is the force acting on the object?
A.1500N
B.300N
C.3000N
D.600ON
pls helppp :)List several examples of applied force, normal force, and friction that you’ve observed in your life.
ill mark brainliest if the answer is actually helpful:p
Answer:
an example for applied force is
Explanation:
The applied force is the force applied to the object to either displace it or change its shape.
HOPE THIS HELPS
The vertical columns on the periodic table of elements are called groups.
A True
B. False
Answer:
True
Explanation:
PLS HELP, WILL GIVE BRAINLIEST
what is the right part of a chemical equation called?
2H2 + O2 ---> 2H2O(what is this part called)
a. chemical equation
b. products
c. reactants
d. yields
Answer:
I'm pretty sure its product.
Explanation:
Hope this helps and have a wonderful day!!!!
Which layer of the earth is the thickest?
A) Crust
B) Mantle
C) Outer core
D) Inner core
C) OUTER CORE
IT IS THE THICKEST
A car is traveling at 120 kilometers per hour with 35,000 joules of kinetic energy on the freeway when it suddenly applies its brakes and comes to a screeching stop. How much of the original 35,000 joules of energy is left?
Answer:
0 J is left (No amount of the original 35000 J energy is left)
Explanation:
From the question
Kinetic Energy (K.E) = 1/2mv²................... Equation 1
Where m = mass of the car, v = velocity of the car.
make m the subject of the equation.
m = 2K.E/v²..................... Equation 2
Given: K.E = 35000 Joules, v = 120 km/h = (120×3600/1000) = 432 m/s
Substitute these values into equation 2
m = (2×35000)/432²
m = 0.375 kg.
If a brake is suddenly apply,
Then, the velocity of the car = 0 m/s.
Therefore,
K.E = 1/2(0.375×0²)
K.E = 0 J.
From the baove analysis, No amount of the original 35000 J energy is left.