Answer:
39.2 m/s
Explanation:
Find the time for the first one to hit the ground
h = vo t - 4.9 t^2 with h = o
0 = 49 t - 4.9 t^2 t = 10
second stone hits ground in 10 - 2 - 8 seconds
0 = vo (8) - 4.9(8)^2
vo = 39.2 m/s
When a stone is thrown vertically upwards at a velocity of 49m/s, and after 2s another stone is thrown vertically upwards, If the two stones strike the ground at the same time the velocity with which the second stone will be 39.2 m/s.
velocity is rate of change of displacement with respect to time. it is measured in m/s.
When a stone is thrown vertically upwards acceleration due to gravity acts opposite to the velocity. At the maximum height, final velocity becomes equal to zero. hence according to kinematic equation.
v₂² = v₁² - 2as = 0
v₁² = 2as
49² = 2×9.8×s
s = 49² ÷ 2×9.8
s = 122.5 m
This is maximum height attained by the a stone.
Time required for the first stone to attain max height,
s = ut -1/2at²
122.5 = 49t - 1/2*9.8t²
9.8t²-98t+245= 0 this is quadratic equation in t, solving it we get,
t= 5s
Total time of the flight of the first stone is 10s
According to the problem, Both the stones falls at same time, hence Total time of flight of second stone will be 10-2 = 8s
According to to projectile motion time of the flight is given by,
t = 2vsinθ ÷ g
here θ = 90°
t = 2v/g
8 = 2v/9.8
v = 8×9.8/2
v = 39.2 m/s
The velocity of the second stone with which it was thrown is 39.2 m/s.
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Fill in the blanks:
Words: Increases, decreases, Dimmer, is the same
1) When we add another lamp into a series circuit, the total resistance _____, this means that the total current _____. Also, the potential difference across each of the lamps ______. This means that the lamps all become_____.
2)When we add another lamp into a parallel circuit in a new branch, the total resistance ________, the current through each lamp ______. Also, the potential difference across each of the lamps ______. This means that the lamps have the same brightness.
Answer:
See Below
Explanation:
1) When we add another lamp into a series circuit, the total resistance increases, this means that the total current is the same. Also, the potential difference across each of the lamps decreases. This means that the lamps all become dimmer.
2)When we add another lamp into a parallel circuit in a new branch, the total resistance decreases, the current through each lamp decreases. Also, the potential difference across each of the lamps is the same. This means that the lamps have the same brightness.
14*3(36/2(1*3)/6
[tex]14 \times 3(36 \div 2(1 \times 3) \div 6[/tex]
1 × 3 = 3
step 3. find 36 divided by 236 ÷ 2 = 18
step 4. add the values together18 + 3 = 21
step 5. find 14 times 314 × 3 = 42 you can also do 7 × 6 and will get the same result because 7 is half of 14 and 3 is half of 6
step 6. add what is outside the parentheses21 + 42 = 63
step 7. divide by 663 ÷ 6 = 10.5 [tex]-- >[/tex] 10 remainder of 3 remainder means left over
Which notation is commonly used on force diagrams to show forces acting on an object?
FD
Fz
FN
Fx
Answer:
FD (Force Diagram)
Explanation:
Is putting ice cubes into soup convection, conduction or radiation
The glass is attracting the pieces of paper. What does
this tell you about the charges on the glass and the
paper?
Answer:
If the charges of both the paper and glass attract we can deduce that both charges with opposite signs. If they were repelling each other then their charges would have the same sign.
so in this case:
ONE HAS A POSITIVE CHARGE WHILE THE OTHER HAS A NEGATIVE CHARGE
Kinetic energy and mass are ____ proportional.
Answer:
directly
Explanation:
Answer: Directly
Explanation:
The skateboarder starts at the top of the ramps, and rolls down and back up the other side. Which graph shows the most Kinetic Energy?
Answer:
C
Explanation:
Usually when you are at the bottom you are at peak speed. It also shows that Kinetic Energy is the green bar and in picture C the green bar is highest.
Explain the use of each part of screw gauge.
Answer:
Ratchet- To rotate the screw by turning it so that the object is gently held between the shud and spindle of the screw.
Sleeve- To mark main scale and base line.
Thimble- To mark circular scale.
Main scale- To read length correct up to 1mm.
Circular scale- Helps to read length correct up to 0.01mm.
What is one way that plants can harm the environment?
Answer:
Invasive plants also degrade the environment by changing the species composition and the ecology of invaded ecosystems
Explanation:
Answer:
they can harm the enviroment by changing the species composition and the ecology of invaded ecosystems !!
As the wavelength of electromagnetic radiation increase
Answer:
the frequency and the radiation of radiation decreases.
Explanation:
Describe the unique characteristics of fluids.
Answer:
Surface tension, capillary action, and viscosity are unique properties of liquids that depend on the nature of intermolecular interactions. Surface tension is the energy required to increase the surface area of a liquid by a given amount. The stronger the intermolecular interactions, the greater the surface tension
Astronomers classify galaxies into three basic types: spiral, elliptical, and irregular. If the Sun and Earth were located on the edge of an elliptical galaxy, what would you expect to see when you look up in the sky at night
Most of the night sky would be dark with only a few stars if the solar system were moved on the edge of galaxy.
What we can see at night if sun and earth moved to the edge?If the Sun and Earth were moved on the edge of an elliptical galaxy, we can see most of dark and few stars in the sky at night because stars are present at large number at the center of galaxy and fewer at th edges.
So we can conclude that most of the night sky would be dark with only a few stars if the solar system were moved on the edge of galaxy.
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Ralph is studying chemical potential energy. Which of the following activities would help Ralph in his studies?
A. Determining the energy in the bonds of a water molecule
B. Measuring the change in length of a stretched rubber band
C. Observing objects of different masses being dropped from a height
D. Calculating the rate at which a car increases speed moving downhill
Answer:
A
Explanation:
D measusers the speed
C measures GPE
B tests Hookes Law
A is rhe only one that isnt related to physics and has chemistry involved
What is wave motion ?
Explanation:
Literally wave motion is a motion which is like wave .It denotes to transfer of energy and momentum.It is denoted to transfer of matter between two mediums virtually not actually.The force acting on a body of mass 200 g is equal to 0. Determine the velocity of the body 3 seconds after the start of the observation, if at the initial moment of the observation its velocity is 5 m / s?
Answer:
You do a study of hypnotherapy to determine how effective it is in increasing the number of hourse of sleep subjects get each night. You measure hours of sleep for 12 subjects with the following results. Construct a 95% confidence interval for the mean number of hours slept for the population (assumed normal) from which you took the data.
After a neutral object loses 2 electrons, it will have a
net charge of
A) -2 elementary charges
B) +2 elementary charges
C) -3.2 x 10-19 elementary charge
D) +3.2 x 10-19 elementary charge
Answer:
the measured charge will be -2 elementary charges.
Explanation:
If you ride a bicycle 36 m in 12 seconds, what is your speed?
O A. 0.3 m/s
O B. 3 m/s s
O C. 0.09 m/s
/
D. 2 m/s
Answer:
3m/s
Explanation:
Speed is distance/time,
36m/12s = 3m/s
Stefan pushes a cart with three books so it just reaches the end of a track. He puts six books onto the cart. What must he use next time so the cart reaches the end of the track?
Answer:
if its adding its 9 if its multiplying its 18 if its division its 2
Need Help Immediately. Brainly will be given to the best response!
Answer: Its (B)
Explanation
Answer:
Option B
Explanation:
See angular velocity is decreasing with respect to time , angular acceleration is negative .
The slope of the graph should be angular acceleration as slope is change in y with respect to x .
Here initial velocity made twice
so y intercept or vertical intercept should go twice up wards.
The horizontal intercept will also go twice rightwards because slope or angular acceleration is constant given .
If scale is one box=1units
new vertical intercept=2(3)=6New horizontal intercept=2(3)=6Draw a line to connect them .Remember that displacement will be doubled also
Does the moon have water?
Explanation:
after rereading: Yes, there is a term for water on the moon and it's called lunar water, pretty straightforward. you can check out moon.nasa.gov, or literally look this up in the magical (g-engine) and it'll gove you a few articles.
______________________
oh my, sorry, i thought the question asked if the moon moved water, in which case: I wouldn't say that the moon actually MOVES the water, but yes, its gravitational force is strong enough to affect tides on Earth. (i could've sworn that's what I saw but whatever, sorry!)
define health psychology
Answer:
"Health psychology is a specialty area that focuses on how biology, psychology, behavior, and social factors influence health and illness."
-Verywell Mind
Hope I helped!
Explanation:
In one or two sentences make and justify a claim about two aspects of the picture that illustrate behaviors of light.
We can make the claim that light can be reflected, which is justified by the reflection seen on the water as well as the colors seen in the photo.
How can we tell that light is being reflected?We can claim that light can and is being reflected in this image due to the reflection in the water as well as the colors. As the light traveling in the air collides with the water, it abruptly changes speed, causing a portion of these waves to be reflected back, thus creating a mirror image on the surface of the water. This is also the case with colors, which are caused by a material reflecting all but one wavelength of light.
Therefore, we can confirm that it is possible to make the claim that light can be reflected, which is justified by the reflection seen on the water as well as the colors seen in the photo.
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PLS HELP MEEEE
1. A large positive charge is placed very far away from a small negative charge. Which of the best explains the interaction between the two charges?
(Standard SPS10 c)
A. An attractive, weak force
B. A repulsion, strong force
C. A repulsive, weak force
D. An attractive, large force
Answer:
A. An attractive, weak force
Explanation:
I got it right
An attractive, weak force best explains the interaction between the two charges. The force between two charges is known as the Columb's force.
What is the charge?When the matter is put in an electromagnetic field, it has an electric charge, which causes it to experience a force. A positive or negative electric charge can exist.
Charges that are similar repel each other, whereas charges that are dissimilar attract each other. The term "neutral" refers to an item that has no net charge.
A large positive charge is placed very far away from a small negative charge. Due to the far distance, the force will be a weak force.
While due to the opposite polarity the charge is attractive in nature.
Hence an attractive, weak force best explains the interaction between the two charges
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A kid on a skateboard is halfway down a hill. If he has 500J of kinetic energy, what is the total energy in the system, his potential energy and his kinetic energy?
Give: Total energy [1] KE [2] PE [3]
as the skateboard moves halfway down the hill, kinetic energy will increase, and potential will decrease, but the total will stay 500 J
potential energy will go from 500 to (500÷ 2) = 250 J
kinetic will go from 0 to 250J halfway
wyzant
A 10 N force and a 30 N force act on an object in the SAME DIRECTION . What is the net force on the object?
Answer:
40N
Explanation:
the forces act in the same direction so we add the forces
Can I please get help to add onto this? Is there anything else i can add? Should i delete anything? Please let me know
Explain why applied force is plotted on the vertical axis of the graph even though it is the independent variable in this investigation.
-----------------------------------------------------------------
Force is an independent variable. Hooke's law states that the force required to stretch or compress a spring by a certain distance is proportional to that distance, which applies in the spring. When changing the force, you apply the displacement change. The greater the displacement, the more the spring contracts. The slope of the line tangent to the graph gives the spring constant. is what gets the spring's potential energy. multiplying by F * x to gets the work done
If the error in the angle is 0.50, the error in sin 90° is
The error in the measurement of sin 90 degrees at the given error in angle is 0.001.
Error in measurementThe error in measurement is obtained from the difference between the actual measurement and the observed measurement.
The error of sin 90 degrees is calculated as follows;
Actual measurement = sin 90 = 1
Observed measurement = sin(90 - 0.5)
Observed measurement = sin(89.5) = 0.999
Error in measurement of sin 90 degreesError in measurement = Actual measurement - Observed measurement Error in measurement = 1 - 0.999
Error in measurement = 0.001
Thus, the error in the measurement of sin 90 degrees at the given error in angle is 0.001.
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What is convectional current?.... .
Answer:
Convection is the transfer of heat from one place to another along with the motion of the object's particles. Water is a poor conductor. However, when the bottom water is heated, it turns out that the top water is also hot. This means that there is another way of transferring heat to the water, namely convection.
Explanation:
A convectional current is a process that involves the movement of energy from one place to another.
force and ___ work together cause objects to move or to stay in place
Answer:
frictional force
What is meant my magnetism ?
Magnetism is the property of a material produced, by the motion of electric charge resulting in attraction and repulsion between objects.