Answer:
Our kinetic energy becomes 4 times bigger
What is the initial velocity of a projectile that is launched at a 25o angle and travles 70 km in 25 seconds?
Answer: The initial velocity of the projectile is 3.1 km/s
Explanation:
There is a problem with the question because we do not know in which direction the projectile travels 70 km.
I will assume that the projectile travels 70 km horizontally, as is the usual case.
I will also assume that 25 seconds after the projectile is fired, it hits the ground.
Suppose that the initial velocity of the projectile is V0, and this velocity V0 can be thought as the hypotenuse of a triangle rectangle, then the x-component and the y-component of the velocity will be the catheti of this triangle rectangle, then we can write:
Vy = V0*sin(25°)
Vx = V0*cos(25°).
Now, the vertical problem does not affect the horizontal one, so we can see only the horizontal case.
Here we don't have any force, then there is no acceleration, then the velocity is constant and it is equal to:
v(t) = V0*cos(25°)
For the horizontal position we can integrate over time to get:
p(t) = V0*cos(25°)*t + p0
where p0 is the initial position, and we can assume that it is equal to zero.
Then:
p(t) = V0*cos(25°)*t
Now we know that in t = 25s, the position is 70km
(because the projectile travelled 70km in 25 seconds) then:
p(25s) = 70km = V0*cos(25°)*25s
Now we can solve this for V0.
V0 = 70km/(cos(25°)*25s) = 3.1 km/s
The initial velocity of the projectile is 3.1 km/s
The thing you can get from this is that we can analyze the vertical problem and the horizontal problem separately (for example, here we only solved the horizontal case and we ignored the vertical one).
Suppose you stand on the rim of a space station. If the radius of the station is 12,000
meters, at what tangential speed must the rim of the station move in order for you to have the same weight as on the Earth?
[HINT: F=mv2/r = mg]
Answer:
circle
Explanation:
because Earth is not oblong
You see a flash of lightning and hear thunder 3 seconds later. If the air temperature is 24°C that day, determine how far away the storm is.
Answer:
Explanation:
speed of sound in 24 degrees celsius
345.48m/s
hence 345.48m/s x 3s = 1036.44m
The body of the runner was found in the park one early, hot summer morning. Her body shows rigor in her face, neck, arms, and torso. How long has been dead?
for a long time but has been preserved by ice
a wall is painted yellow with yellow paint. explain why the paint makes the wall look yellow
What is the acceleration of an object that goes from 45m/s to 10 m/s in 5 seconds?
Answer:
[tex]\boxed {\boxed {\sf a= -7 \ m/s^2}}[/tex]
Explanation:
Acceleration is the change in velocity over time.
[tex]a= \frac {v_f-v_i}{t}[/tex]
The object accelerates from 45 meters per second to 10 meters per second in 5 seconds. Therefore,
[tex]v_f=10 \ m/s \\v_i= 45 \ m/s \\t= 5 \ s[/tex]
Substitute the values into the formula.
[tex]a= \frac{ 10 \ m/s - 45 \ m/s}{5 \ s}[/tex]
Solve the numerator.
[tex]a= \frac { -35 \ m/s}{5 \ s}[/tex]
Divide.
[tex]a= -7 \ m/s/s[/tex]
[tex]a= -7 \ m/s^2[/tex]
The acceleration of the object is -7 meters per square second. The acceleration is negative because the object's velocity decreases and the object slows down.
PLEASE PLEASE HELP AND PUT A REAL ANSWER ;-;. ALSO WILL GIVE BRAINLEST!!
High pressure systems are found in the:
troposphere
stratosphere
mesosphere
thermosphere
Answer:
Troposphere
High-pressure areas form due to downward motion through the troposphere, the atmospheric layer where weather occurs.
Tonks changes her hair color for a party with a red color rinse. The next day, she washes the color out of her hair and it returns to its original brown color. Has a chemical change occurred? Explain your answer.
Answer: No , a chemical change has not occured as it was easily reversed.
Explanation:
Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances. It can only be reversed with the help of a chemical reaction.
Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.It can be easily reversed.
As the hair colour was washed out and returned to its original brown colour, it was a physical change.
A boat trip travels are 15 miles in the direction of 45° east of north for an hour the boat then turn and travels at 18 m/s in a direction 5° north of East for an hour
Answer:
Hello your question is incomplete below is the missing piece
What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number.
answer : 25.73 m/s
Explanation:
Given
V1 = 15 miles/hour = 6.71 m/s [ 45° EN ]
V2 = 18 m/s [ 5° NE ]
Calculate the resultant velocity
Vr = 6.71 m/s[45°] + 18m/s[5°].
Vr = ( 6.71 *Cos45° + 6.71 *sin45°) + ( 18 *Cos5° + 18*sin5° )
Vr = ( 4.74 + 4.74 i )+ ( 17.93 + 1.57i) = 22.67 + 12.18i.
Therefore the magnitude
= [tex]\sqrt{22.67^2 + 12.18^2}[/tex] = 25.73 m/s
why are negative charges more mobile than positive charges?
Answer:
This is because the protons have more mass and are harder to get moving. Although electrons are very small, their negative electrical charges are still quite strong. Remember, the negative charge of an electron is the same as the positive electrical charge of the much larger in size proton.~Tori
Explanation:
brick falls from a height of 10 m. Calculate the time taken for the brick to reach the ground.
Use physics kinematic equations to solve for t. Lookup physics kinematic problems on Kahn for more understanding.
How did the police catch the Golden State Killer?
Answer:
lhf
Explanation:
.
Alondra applies 24 N of force to the end of a stick (a type of lever) to open a can of paint.
The lid resists with 6 N of force. What is the mechanical advantage?
Answer:
1/4
Explanation:
Mechanical Advantage = Load/Effort
Given
Effort applied = 24N
Load = 6N
Substitute
MA = 6/24
MA = 1/4
Hence the mechanical advantage is 1/4
Answer:
4
Explanation:
24n/6n=4
What is the formation of a shadow?
Answer:
Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow
Explanation:
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A small coin of mass m is initially at rest. It is dropped from a height h above ground level.
The coin has a speed v as it hits the ground.
The gravitational field strength g is equal to 10N/kg.
(a) State an expression for:
• the gravitational potential energy of the coin at a height h above ground level
gravitational potential energy = .........................................................................................
• the kinetic energy of the coin when travelling at a speed v.
kinetic energy = .................................................................................................................[2] (b) The coin is dropped from the top of a building of height 380m.
Determine the speed of the coin as it hits the ground. You may ignore air resistance.
Explanation:
(a) The gravitational potential energy of the coin above the ground level is given by :
[tex]E=mgh[/tex]
Where
m is mass of the object
g is acceleration
h is height
The kinetic energy of the coin when travelling at a speed v is given by :
[tex]E_k=\dfrac{1}{2}mv^2[/tex]
(b) The coin is dropped from the top of a building of height 380m. Let v the speed of the coin as it hits the ground. Using the conservation of energy.
[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 390} \\\\v=87.42\ m/s[/tex]
Hence, this is the required solution.
Yass QUEEN. What is the relationship between Pressure, Area, and Force?
Answer:
pressure=force/area is therelationship between Pressure, Area, and Force.
how might have atomic numbers of elements indicate that newly discovered elements would have to have very high atomic numbers
Answer:
The scientists who discovered them will start things off by proposing a name. But it will be down to the International Union of Pure and Applied Chemistry (IUPAC) to approve it.
I'm slow...
Newly discovered elements often occur at the bottom of the groups where they occur in the periodic table hence they must have very high atomic numbers.
In the periodic table, the properties of elements are arranged in increasing order of their atomic numbers according to the modern periodic law. As you move down the group, the atomic numbers of elements continue to increase.
Since the properties of elements are periodic, newly discovered elements often occur at the bottom of the group hence they have very high atomic numbers.
Learn more: https://brainly.com/question/17274608
What is a soundwave please quick
In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain.
Which of the following best describes how the spinal cord and the brain work together?
A
Messages travel to and from the brain to other parts of the body through the spinal cord.
B
The spinal cord controls the body’s movement, and the brain controls coordination.
C
The spinal cord sends messages to the brain, telling it what functions to perform.
D
The spinal cord is a bone in the back that supports your skull, which houses the brain.
Messages travel to and from the brain to other parts of the body through the spinal cord. Thus, brain and spinal cord works together and option A is the correct answer.
How does the brain and spinal cord work together?The spinal nerves connect the brain to the nerves in the major part of the body. Other nerves connect the brain to the eyes, ears, and other parts of the head directly. This network of nerves relays messages between the brain and the rest of the body.
The brain and spinal cord comprise the central nervous system. The brain is in charge of how we think, learn, move, and feel. The spinal cord relays messages from the brain to the nerves that run throughout the body.
Therefore, brain and spinal cord works together as messages travel to and from the brain to other parts of the body through the spinal cord.
To learn more about brain and spinal cord, click here:
https://brainly.com/question/5430113
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8. Give the net force for the following:
10 N
30 N
3N
3N
2N →
4N->
Js
SN
Answer:
i think it's is 30N
Explanation:
i got it right
A ball rolls from point A to point B. The total energy of the ball at point A isn’t the same as the sum of its potential energy and kinetic energy at point B. Which statement best explains this situation?
The rolling ball doesn’t follow the law of conservation of energy.
Some of the ball’s energy is transformed to thermal energy.
The rolling ball loses some of its energy because of gravity.
The ball absorbs some of its own potential energy.
Answer:
option b
Explanation:
because the law of conservation
it means that energy can never created nor be destroyed
even it will change into another form if energy
Answer: B
Explanation:
calculate the gravitational attraction force between a man with a mass of 100kg and a child with a mass of 20kg if they are 100mm apart.
Answer:(G=6.67×10−11Nm2/kg2)
Explanation:
Hi people; there's a question that has been so confusing for me and a friend of mine.
0°C + 0°C = 64°F
Is this correct or wrong?
Answer:
The correct answer is: 0°C + 0°C = 32°F
Explanation:
We need to remember the conversion equation from Celsius to Fahrenheit:
[tex]y^{\circ}F=(x^{\circ}C * \frac{9}{5})+32[/tex]
In our case x = 0, then y will be:
[tex](0^{\circ}C * \frac{9}{5})+32=32[/tex]
[tex]y=32^{\circ}F[/tex]
Now 0°C + 0°C is just 0°C because if we add a body at a certain temperature to another body with the same temperature the total temperature will the same.
Then, knowing that 0°C = 32°F we can conclude that:
[tex]0^{\circ}C+0^{\circ}C=32^{\circ}F[/tex]
I hope it helps you!
True or false question scientists can predict when an earthquake will occur
Answer:
False
Explanation:
Neither the USGS nor any other scientists have ever predicted a major earthquake. USGS scientists can only calculate the probability that a significant earthquake will occur in a specific area within a certain number of years.
A child riding a bike has a total mass of 60kg. What is the momentum of the child-bike system if the child rides a distance of 200 m in 5 seconds at a constant speed?
Answer:
Momentum = 2,400 Pa
Explanation:
Given:
Total mass = 60 kg
Distance travel = 200 m
Time = 5 sec
Find:
Momentum
Computation:
Velocity = Distance / time
Velocity = 200 / 5
Velocity = 40 m/s
Momentum = Mass x Velocity
Momentum = 60 x 40
Momentum = 2,400 Pa
Which of the following elements is NOT vital to all living organisms? *
-Selenium
-Oxygen
-Carbon
-Hydrogen
hydrogen
Explanation:
Selenium is an element whose trace amounts are essential for life, as proven in 1979 based on its cumulative function with vitamin E [23]. Increasing deficiency of selenium in different parts of the world leads to the occurrence of many pathological disorders
A nail is inserted in the trunk of a tree at a height of 1 meter from the ground
level. After 3 years, where will the nail be present?
Answer:
15m
Explanation:
Hello! first to solve this problem we must find that so much that the tree grew in the 15 years this is achieved by dividing the height of the tree before and after
the tree grew 10 times its initial length in 15 years, so to find how tall the nail is, we multiply this factor by 1.5m
X=(1.5m)(10)=15m
the nail is 15 meters above ground level
what is ohms law of a resistor?
Answer:
La Ley de Ohm muestra la relación que existe entre una resistencia, la tensión o voltaje en sus terminales y la corriente que pasa a través de ella.
Explanation:
Which way do the trade winds usually blow in the Pacific Ocean
Answer:
Hey mate.....
Explanation:
This is ur answer......
Winds and currents in the Pacific flow predominantly from East to West. Above the equator Pacific Ocean trade winds blow from the northeast. Below the equator they blow from the southeast.
Hope it helps!
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What is the root cause of earths magnetic field?
Answer:
I'm not sure but I think it is electric currents in the outer core