A boy threw a ball upward and it took 3 sec to reach the highest point. Determine the initial velocity of the ball.
Answer:
V initial = 29.4 m.s²
Explanation:
( Using the laws of motion)
V final = V initial + Acceleration × time
0 = V initial + ( -9.8)(3)
29.4 = V initial
* I took upward as positive that's why I substituted -9.8 *
* for V final we know that at maximum height the ball is not moving thats why is = 0 *
What is the resultant of the two vectors shown?
Explanation:
The correct is (c). cuz, the tail of A and the tip of B will join
One point charge has a magnitude 5.4x10-7 C. A second charge 0.25 meters away has a magnitude of 1.1x10-17 C. What is the electric force magnitude of one charge on the other?
The electric force on the charges will be equal and opposite in nature and the magnitude will be 8.5536 × 10⁻¹³ Newton.
Formula for electrostatic force is F = ( K q1 q2 )/ r²
where q1 and q2 represent the charges and r represents the distance between them and the value of K is 9 × 10⁹.
In question we have given
value of q1 = 5.4 x 10⁻⁷ C
value of q2 = 1.1 x 10⁻¹⁷ C
distance between the (r) = 0.25 m
Applying the formula
F = ( K x (5.4 x 10-7) x (1.1x10-17) )/ 0.25²
F = ( (9 × 10⁹ ) x (5.4 x 10-7) x (1.1x10-17) )/ 0.25²
F = ( (9 × 5.4 × 1.1) × ( 10⁹ × 10⁻⁷ x 10⁻¹⁷) )/ ( 6.25 × 10⁻² )
F = ( 53.46 × 10⁻¹⁵) / ( 6.25 × 10⁻² )
F = 8.5536 × 10⁻¹³ Newton
Electrostatic force = 8.5536 × 10⁻¹³ Newton
So, The point charges are possessing equal and opposite electrostatic force of magnitude 8.5536 × 10⁻¹³ Newton.
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Voltage is another name for the
difference. what word completes the sentence?
Question 10 of 25
Which of these is an advantage of hydroelectric energy?
OA. Is expensive to build or maintain
OB. Harms aquatic organisms
OC. Is a renewable energy source
OD. Is available in limited areas
SU
The main advantage of hydroelectric energy is the fact that it is a renewable energy source (Option C).
What is hydroelectric energy?Hydroelectric energy refers to the energy from water bodies that can be used to generate electricity.
Hydroelectric energy is stored as potential energy and then converted to kinetic motion energy to be converted into electricity.
Hydroelectric energy is renewable because it is indefinitely generated by water bodies in nature.
In conclusion, the main advantage of hydroelectric energy is the fact that it is a renewable energy source (Option C).
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How many groups are in the modern periodic table?
Answer:
18 groups are in the modern periodic table
Answer:
There's 18 groups I'm pretty sure
A train travels 8.81 m/s in a -51.0° direction. The train accelerated for 2.23 s, changing its velocity to 9.66 m/s in a 37.0° direction. What is (delta)x?
The value of the [tex]\rm \triangle x[/tex] will be 29.14 m. Delta represent the change.
What is velocity?The change of distance with respect to time is defined as speed. Speed is a scalar quantity. It is a time-based component. Its unit is m/sec.
The velocity in the part 1;
V₁ = 8.81
The velocity in the part 2;
V₂ = 9.66 m/sec
The resultant of the two vectors of velocity gives the velocity for the connecting path.
[tex]\rm V = \sqrt{8.81 ^2 + 9.66^2 } \\\\ V= 13.07 \ m/sec[/tex]
The time period for the train accelerates;
[tex]\rm \triangle x = v \times t \\\\ \triangle x = 13.07 \ m/sec \times 2.23 \ sec \\\\ \triangle x = 29.14 \ m[/tex]
Hence the value of the [tex]\rm \triangle x[/tex] will be 29.14 m.
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Answer:
the answer is 14.77 for ∆x
the answer for ∆y is 1.16
If you double the current through a resistor, by what factor does the power dissipated by the resistor change?.
If you double the current through a resistor, the power dissipated by the resistor change by factor of 4.
What is electric current?The stream of positive charges which flow from the positive terminal to the negative terminal of the battery attached in a circuit.
Power dissipated through a resistor is related to current as
P =I²R
When the current is doubled, the new power will be
P' = (2I)²R
P' = 4 I²R
P' = 4P
Thus, the power change by the factor of 4.
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The world record for pole vaulting is 6.15 m. If the pole vaulter’s gravitational potential is 4942 J, what is his mass?
From the calculations, the mass of the pole is 82 Kg.
What is potential energy?The term potential energy has to do with the energy that is possessed by a body by virtue of its position.
Given that;
height = 6.15 m
PE = 4942 J
mass = ??
g = 9.8 m/s^2
Now
PE = mgh
m = PE/gh
m = 4942 J/9.8 m/s^2 * 6.15 m
m = 82 Kg
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Objects A and B have been projected from the same point at angles 30° and 60° with the ground, respectively. If both objects
reach the same height what is the ratio of their velocities Va and Vb
A). 3:1
B). 2:1
C). 1:1
D). 2:1
If both objects reach the same height, the ratio of their velocities Va and Vb is 3:1. The correct option is A.
What is projectile?When an object is thrown at an angle from the horizontal direction, the object is said to be in projectile motion. The object which follows the projectile motion.
Objects A and B have been projected from the same point at angles 30° and 60° with the ground, respectively. If both objects reach the same height.
The maximum height of the objects A and B are same, so
H = Va² sin²30 / 2g = Vb² sin²60 / 2g
Va²/Vb² = sin²60/ sin²30
Va/Vb = 3:1
Thus, the correct option is A.
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If a star is moving away from you at constant speed, the absorption lines in its spectrum will.
Answer:
The absorption lines will shift to the red (become longer).
This is because of the extra distance that a wavelength λ must travel between the vibrations of the source producing the spectrum.
Note that the Doppler effect of the source is slightly different for light waves than it is for sound waves because sound waves require a medium in which to travel while light waves do not require such a medium (example air).
If the slowest instruction in the SCA executes in 12.5 ns, then what is maximum system clock frequency in MHz
Since the slowest instruction in the SCA executes in 12.5 ns, the maximum system clock frequency is 80 MHz
To answer the question, we need to know what frequency is.
What is frequency?Frequency is the number of oscillations per second of a wave.
It is given by f = 1/T where T = period of wave
Now, given that the slowest instruction in the SCA executes in t = 12.5 ns, we need to calculate maximum system clock frequency, f.
What is the maximum system clock frequency?So, f = 1/t
= 1/12.5 ns
= 1/(12.5 × 10⁻⁹ s)
= 1/12.5 × 10⁹ Hz
= 0.08 × 10⁹ Hz
= 80 × 10⁻³ × 10⁹ Hz
= 80 × 10⁶ Hz
= 80 MHz
So, the maximum system clock frequency is 80 MHz
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6.Riding his bike, Mike can start from rest and get going at 10 m/s in 4 seconds. Joy can get
going 15 m/s in 5 seconds. Who has a greater acceleration? How do you know?
Answer:
Joy has a greater acceleration.
Explanation:
Mike
v = v₀ + at
10 = 0 + 4a
a = 2.5 m/s²
Joy
v = v₀ + at
15 = 0 + 5a
a = 3 m/s²
--
Using the UAM equations, we can determine that Joy's acceleration is 3 m/s² while Mike's acceleration is only 2.5 m/s².
Describe how a star is formed?
____________________________
Answer:
Star Formation
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
hy XD ~
as resistors are added in series
Answer:
decrease,inverse
Explanation:
........................
Which bronchus is about 5cm long and slightly narrower and more horizontal than the one on the opposite side
The bronchus of 5cm long, slightly narrower and more horizontal than the one on the opposite side is the left main bronchus.
What is a bronchus?A bronchus is a tubular structure that links the trachea with the lungs in the respiratory airways.
The main function of the bronchus is to transport oxygen during gas exchange, which is required in cellular respiration.
In conclusion, the bronchus of 5cm long, slightly narrower and more horizontal than the one on the opposite side is the left main bronchus.
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A chain of length L has a mass of m which is uniformly distributed. When it is placed on a smooth horizontal table, 1/4 of its length hangs over the edge of the table (as shown in the figure). Then the chain slides away from the table freely, how much gravitational potential energy has changed from the beginning to the chain just sliding away from the table? (The height of the table from the ground is much greater than L)
Gravitational potential energy has changed from the beginning to the chain just sliding away from the table willl be MgL/24.
What is gravitational potential energy?The energy that an item has due to its location in a gravitational field is known as gravitational potential energy.
Length of hanging part, L/4
The gravitational potential energy is;
Work = Gravitational potential energy
Work done =force×displacement
[tex]\rm W = \frac{Mg}{3} \times \frac{L}{8} \\\\ W = \frac{MgL}{24}[/tex]
Hence, gravitational potential energy has changed from the beginning to the chain just sliding away from the table willl be MgL/24.
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If you float a piece of wood in a container half-full of water that rests on a weighing scale, the weight reading on the scale will
If you float a piece of wood in a container half-full of water that rests on a weighing scale, the weight reading on the scale will increase.
What is Buoyancy?Buoyancy is the force through your fluids or total or submerged bodies. Also known as Archimedes' theorem. The fluid of the direction on the body produces a resultant force but with the direction of the weight, with the opposite direction, upwards.
All material submerged in a liquid under the action of buoyancy, for this reason we have that the value on the scale will be increased with a system of a wood floating in water.
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One exciting fairground ride acts like a giant catapult. The capsule which the ‘rider’ is strapped in is fired high into the sky by rubber straps. Explain the energy changes taking place on the ride.
Answer:
- elastic energy of rubber straps → KE of capsule
- KE → GPE as capsule
Explanation:
A cube of metal of side 10cm is fully immersed in a liquid of relative density 0.8.Calculate the upthrust experienced by the body. Take density of water=1000kgm3 and g=10ms-1
The upthrust experienced by the cube of metal is determined as 7.84 N.
Upthrust experienced by the body
The upthrust experienced by the body is calculated as follows;
Fu = ρVg
where;
ρ is density of the bodyV is volume of the bodyg is acceleration due to gravityDensity of the bodyS.G = density of the body / density of water
density of the body = S.G x density of water
ρ = 0.8 x 1000 kg/m³
ρ = 800 kg/m³
Volume of the bodyV = L³
V = (0.1)³
V = 0.001 m³
Upthrust = ρVg
Upthrust = 800 x 0.001 x 9.8
Upthrust = 7.84 N
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which will have longer shadow: ben whose height is 5 feet tall and 2 inches or his brother mike who is 6 feet and 2 inches when they both stand under the sun around 10am? i need help asap and anyone get my answer now i will give branliest
Answer: I believe his brother, Mike, who is 6'2, will have the longer shadow.
Cancer and diabetes are two common hereditary diseases.
It is a true statement that cancer and diabetes are two common hereditary diseases.
What are hereditary diseases?The term hereditary diseases are those diseases that occur in parents and could also be found in their offspring. For many of these hereditary diseases, the mechanism of inheritance is unclear.
However, it is a true statement that cancer and diabetes are two common hereditary diseases.
Missing parts:
Cancer and diabetes are two common hereditary diseases. A. True B. False.
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A car traveling along the highway needs a certain amount of force exerted on it to stop it in a certain distance. More stopping force is required when the car has:.
More stopping force is required when the car has to stop in a shorter distance.
What is the relationship between force and acceleration?Force is directly proportional to acceleration according to Newton's second law of motion.
This means that acceleration increases when force increases.
Stopping of a moving car is negative acceleration.
Therefore, more stopping force is required when the car has to stop in a shorter distance.
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can you please help me with this
Answer:
1.76 seconds/cycle
Explanation:
Frequency is 10 cycles / 17.6 seconds
PERIOD is 1/frequency = 17.6 seconds/10 cycles = 1.76 s/c
cycle is a vibration , so the unit may be 1.76 second / vibration
Derive that efficiency is the ratio of output and input work.
Answer:
The efficiency of a simple machine is defined as the ratio of useful work done by a machine (output work) to the total work put into the machine (input work). For ideal or perfect machine, work output is equal to the work input.
Explanation:
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why aren't there lunar and solar eclipses every month?
The moon's orbital plane is different from that of the earth's orbit around the sun due to which lunar and solar eclipses do not occur every month.
What is a solar eclipse?When the moon passes in front of Earth and the sun, it creates a solar eclipse and casts a shadow across the globe.
Only during the new moon phase, when the moon travels squarely between the sun and Earth and casts shadows on its surface, can a solar eclipse occur.
Due to the moon's orbit being five degrees off-center from Earth's orbit around the Sun, lunar eclipses do not happen every month and the Moon often passes above or below the shadow.
Lunar eclipses would happen every month if there were no tilt. Eclipses of the sun and the moon happen equally often.
Hence lunar and solar eclipses aren't coming every month.
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The reason why lunar and solar eclipses do not occur every month is because; the plane of orbit of the moon around the earth is not same as that of earth around the sun.
Why don't lunar and solar eclipses occur every month?When the Moon passes between Earth and the Sun, there's solar eclipse while when the earth passes between the Sun and the Moon, casting a shadow on the Moon, there's lunar eclipse.
Hence, because the plane of orbit of the moon around the earth is not same as that of earth around the sun, we do not have lunar and solar eclipses every month.
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A compound microscope that has an eyepiece lens with a magnification of 10X and an objective lens with a magnification of 25X will have a total magnification of __________ times.
Answer:
35
Explanation:
total magnification = eyepiece lens x objective lens
TM = 10X x 25X
TM = 250X
how can you determine the relative ages of the moon's maria and highlands? (select all that apply.)
The relative ages of the moon's maria and highlands can be determined through the following:
Radioactive datingCrater densityLava flows.What is a Moon maria?This is referred to as the early geologic units of the moon which arose from asteroid impact and subsequent volcanic activity.
The ages can be measured using techniques such as radioactive dating and crater density.
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Where does the halo of a galaxy expand from?
a. the local group out to the dark matter
b. the bulge out to the edge of the disk
c. the irregular cluster out to the regular cluster
d. the edge of the disk out to the bulge
The halo of galaxy expand from the bulge out to the edge of the disk. The correct option is b.
What is universe?Universe is the whole cosmic system of matter and energy. The Earth, the Sun, the Moon, the planets, the stars along with the ,dust , gases, rocks forms the universe.
It went on expanding and stretched to grow as large as possible. It is still now expanding.
The universe consist of fully dark matter, interstellar gases or dust. The This universe began with a big bang , also known as the massive explosion. This universe is still on it way of expanding more.
The formation of stellar halos occurs naturally in a cold dark matter. Universe has halos which occurs from the bottom-up or the large structure of galaxies is formed starting with small objects.
Thus, the correct option is b.
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A results force of 25newtons acts on a mass of 0.50kilogram starting from rest .find acceleretion in m/s2 , the final velocity after 20seconds, the distance moved in m
Answer: See below
Explanation:
a) Using Newton's 2nd Law, rearranging and solving for acceleration
[tex]a &= \frac{F}{m}\\ &= \frac{25\ \text{N}}{0.5\ \text{kg}}\\ &= \boxed{50\ \text{m/s}^2}[/tex]
b) Using the acceleration 50 m/s^2 and the initial velocity v = 0 (since the object starts from rest), the final velocity at t = 20, v can be determined using a suitable equation as follows:
[tex]v &= u+ at\\ &= 0+ 50\ \text{m/s}^2(20\ \text{s})\\ &= \boxed{100\ \text{m/s}}[/tex]
c) To determine the distance s traveled in the 20 seconds, we'll use a suitable equation:
[tex]s &= ut+\frac{1}{2}at^2\\ &= 0+\frac{1}{2}(50 \text{m/s}^2)(20\ \text{s})^2\\ &= \boxed{10\ 000\ \text{m}}[/tex]