Answer:
= 10 g
Explanation:
Half life is the time taken by a radioactive substance to decay by half of the original mass or initial amount.
Therefore, to get the new mass after decay;
New mass = Original mass × (1/2)^n ; where n is the number of half lives.
n = 60 seconds/20 seconds
= 3
Therefore;
New mass = 80 g × (1/2)^3
= 80 g × 1/8
= 10 g
Convert to find the equivalent rate.
The answer is 20,260,000
You serve a volleyball with a mass of 2.1 kg. The ball leaves your hand with a speed of 30 m/s. The ball has—— energy. Calculate it
Answer:
945 j
Explanation:
You have just given the ball kinetic energy, which is given by the following equation:
KE= 1⁄2 m v2 = 1⁄2 (2.1 kg)(30 m/s)2 = 945 Joules
What causes ocean water around the equator to be warmer then the ocean water farther south of the equator
A. Gyres in the northern hemisphere flow clockwise.
B. Upwellings spew warm water toward the equator.
C. The sun heats earth and it’s oceans unevenly.
D. Deep sea vents pump stream into oceans unevenly.
C. The sun heats earth and it’s oceans unevenly.
Hope this helps chu
Have a great day
☆ Dont forget to mark brainliest ☆
Answer:
The correct answer is option C. "The sun heats earth and it’s oceans unevenly".
Explanation:
Ocean water is warmer around the equator than the currents that come farther south of the equator. This phenomenon happens because the sun heats earth and its oceans unevenly since the amount of energy that reaches the Earth is a function of latitude. The equator has a 0 degree latitude, and is at this point at which the Earth receives more heat from the Sun
Refer to the table. Complete the following equations to convert millimeters of mercury to kilopascals or atmospheres to kilopascals.
3.0000 atm =
kPa
7.000 mmHg =
kPa
10.00 kPa =
atm
15.00 kPa =
mmHg
table
Answer:
3.0000 atm = 303.98 kPq
7.000 mmHg = 0.9333 kPa
10.00 kPa = 0.09869 atm
15.00 kPa = 112.5 mmHg
Explanation:
Just did this on edge, all these answers are correct!
which of these is an indication that a chemical reaction has occurred?
1) melting of a substance
2) boiling of a substance
3) formation of a precipitate
4) freezing of a substance
3.
If the reaction forms a new substance it's a chemical reaction.
Why are plane mirrors and convex mirrors unable to form real images?
A. They cannot reflect light.
B. They cannot make light rays converge.
C. They both show only small views of images.
Answer:
B. They cannot make light rays converge.
Explanation:
Real images are defined as the image in which light rays will converge at a point after reflection through the mirror
if the light rays converge and meet at a point in front of mirror then the point of convergence is known as real image
while if the light rays will not converge and the light will diverge after reflection through the mirror then it will appear to meet at a point behind the mirror
this imaginary point is known virtual image
so here in case of plane mirror and convex mirror the light rays will not converge at a point after reflection through the mirror
so it can not form real images
so correct answer will be
B. They cannot make light rays converge.
The light reflected from the surface of a pool of water is observed through a polarizer. How can you tell if the reflected light is polarized?
To determine if the light reflected from the surface of a pool of water is polarized, you can use a polarizer and observe if any changes occur when the polarizer is rotated.
What is a polarizer?A polarizer is a virtuously optical device that can convert an unpolarized light beam into a polarised light beam in some way.
Here,
To determine if the light reflected from the surface of a pool of water is polarized, you can use a polarizer and observe if any changes occur when the polarizer is rotated.
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On vacation at the beach, you bring a radio to the beach. The radio can pick up several different radio stations.Which is the best explanation for this?
A) Sound waves can travel from through the air from the station to your radio.
B) Radio stations broadcast from different locations using their own transmitters.
C) Sound of different pitches are used to transmit information from each radio station. These sound waves can travel over land.
D) Waves are used to transmit the radio signal through the air. These waves are encoded at different frequencies for different stations.
D) waves are used to transmit the rail signal though the air. these waves are encoded at different frequencies for different stations
Answer:
The correct answer is D.
Explanation:
The radio can pick up several different stations because the waves are used to transmit the radio signal through the air. These waves are coded at different frequencies, assigned to different radios. The waves do not mix, so we can tune several radio stations.
Have a nice day!
Which of the following substances is a compound?
A.
solid bronze (an alloy of copper and tin)
B.
a salt water solution
C.
solid iron metal (Fe)
D.
hydrogen sulfide gas (H2S)
Answer:
D. hydrogen sulfide gas (H2S)
Explanation:
A compound is composed of two or more elements chemically bound together.
In this case, hydrogen is chemically bounded with sulfur to form a gaseous compound called hydrogen sulfide.
Answer:
D. hydrogen sulfide gas (H2S)
Explanation:
A compound is composed of two or more elements chemically bound together.
In this case, hydrogen is chemically bounded with sulfur to form a gaseous compound called hydrogen sulfide.
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Explanation:
NEED HELP ASAP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
What is "change" when we are talking about natural and physical systems?
A.
Information that has been proven to be true
B.
A process for using knowledge and skills to acquire new knowledge
C.
Repeated processes that are used in a variety of ways
D.
A variable or alteration to one part that affects an entire system
It would be c repeated processes-that are used in a variety of ways
Answer:
the correct answer would be D. A variable or alteration to one part that affects an entire system.
the other ones dont make sense
~batmans wife dun dun dun....
An amateur player is about to throw a dart with an initial velocity of 15 meters/second onto a dartboard that is at a distance of 2.7 meters. Calculate the vertical distance by which the player will miss the target if he throws the dart horizontally, in line with the dartboard.
A.
0.08 meters
B.
0.16 meters
C.
0.32 meters
D.
1.8 meters
Answer:
B. 0.16 m
Explanation:
The vertical distance by which the player will miss the target is equal to the vertical distance covered by the dart during its motion.
Since the dart is thrown horizontally, the initial vertical velocity is zero:
[tex]v_y = 0[/tex]
While the horizontal velocity is
[tex]v_x = 15 m/s[/tex]
The horizontal distance covered is
[tex]d_x = 2.7 m[/tex]
Since the dart moves by uniform motion along the horizontal direction, the time it takes for covering this distance is
[tex]t=\frac{d_x}{v_x}=\frac{2.7 m}{15 m/s}=0.18 s[/tex]
along the vertical direction, the motion is a uniformly accelerated motion with constant downward acceleration g=9.8 m/s^2, so the vertical distance covered is given by
[tex]d_y = \frac{1}{2}gt^2=\frac{1}{2}(9.8 m/s^)(0.18 s)^2=0.16 m[/tex]
Answer:
0.16 m
Explanation:
How much work is done if you push a 200 N box across a floor with a force of 50 N for a distance of 20m
The Work [tex]W[/tex] done by a Force [tex]F[/tex] refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path.
It should be noted that it is a scalar magnitude, and its unit in the International System of Units is the Joule (like energy). Therefore, 1 Joule is the work done by a force of 1 Newton when moving an object, in the direction of the force, along 1 meter:
[tex]1J=(1N)(1m)=Nm[/tex]
Now, when the applied force is constant and the direction of the force and the direction of the movement are parallel, the equation to calculate it is:
[tex]W=(F)(d)[/tex] (1)
When they are not parallel, both directions form an angle, let's call it [tex]\alpha[/tex]. In that case the expression to calculate the Work is:
[tex]W=Fdcos{\alpha}[/tex] (2)
For example, in order to push the 200 N box across the floor, you have to apply a force along the distance [tex]d[/tex] to overcome the resistance of the weight of the box (its 200 N).
In this case both (the force and the distance in the path) are parallel, so the work [tex]W[/tex] performed is the product of the force exerted to push the box [tex]F=50N[/tex] by the distance traveled [tex]d[/tex]. as shown in equation (1).
Hence:
[tex]W=(50N)(20m)[/tex]
[tex]W=1000Nm=1000J[/tex] >>>>This is the work
A 2.0-ohm resistor is connected in a series with a 20.0 -V battery and a three-branch parallel network with branches whose resistance are 8.0 ohms each. Ignoring the battery’s internal resistance, what is the current in the batter? Show your work.
Answer:
Explanation:
Resolving the parallel resistor branches
[tex]\frac{1}{Rtotal} =\frac{1}{8.0ohm} +\frac{1}{8.0ohm} +\frac{1}{8.0ohm} =2.67Ohm[/tex]
The equivalent resistor is now in series with the 2.0 Ohm resistor
so, by using Ohm's Law
[tex]I=\frac{V}{Rtotal+R} \\I=\frac{20.0V}{2.67Ohm+2.0Ohm} \\\\I= 4.28A[/tex]
What is the difference between three types of mechanical waves?
Answer:
In longitudinal waves, particles travel in the direction parallel to that of the wave motion where as in transverse waves, particles move perpendicular to the direction of the wave motion and in surface waves, particles in the medium move in a circular motion.A good example of longitudinal waves is sound waves. Vibrating a string on the ground can serve as an example of transverse wave.For surface waves, the ocean waves travelling on the surface can illustrate the cicular movement of particles in the water.
Answer:
There are three kinds of mechanical waves depending upon the direction in which they travel or propagate through the medium.
(i) Longitudinal waves
(ii) Transverse waves
(iii) Surface waves
In transverse waves, the particles tend to move in a direction at right angles to the waves whereas in longitudinal waves, they move in parallel direction to each other. When it comes to surface waves they lie in circular motion.
Which excited electron has the lowest energy?
Answer:
The lowest energy of electron is the ground state.
Explanation:
The excited electrons has the lowest energy when it is in the ground state.
What are electrons?The electrons are the spinning objects around the nucleus of the atom of the element in an orbit.
Energy of any exited state is given by E = nh/2π where n =0,1,2,3....
As, the number of excited state increases the energy associated with the electron increases.
So, for n=0, the energy is the lowest and is said to be in the ground state.
Thus, the correct option is B.
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A person with a mass of 15kg is walking uphill at a velocity of2m/s. What is the walker's momentum?
Answer:
30 kgm/s
Explanation:
The momentum of a body is given by the product of mass and its velocity.
∴ momentum = mv
= 15 × 2
= 30 kgm/s
A missile is fired from a jet flying horizontally at Mach 2 (2200 ft/s). The missile has a horizontal acceleration of 1000 ft/s2. Calculate its horizontal velocity at 10.0 seconds after it is fired. (Assume constant acceleration of the missile throughout its flight.) 12,200 ft/s 10,000 ft/s 2300 ft/s 7800 ft/s
Answer:
12200 ft/s
Explanation:
The question is on constant acceleration
→Uniform acceleration motion is given by⇒⇒⇒ Vf=Vo+ at..............(a)
→Where Vf= final velocity=?
Vo=initial velocity =2200 ft/s
a= acceleration= 1000ft/s²
t= 10.0 sec
Substitute values in (a) above
Vf=Vo+ at
Vf= 2200 + ( 1000×10) = 12200 ft/s
Answer:
12,200
Explanation:
got it right on odessyware
2. Periods are
that run from left to right
3. Elements in the same period have the same
Every element in the first period has
element in the second period has
pattern?
shell for its
for its
Every
See the
5. Groups are
that run from top to bottom.
6. The elements of a group have the same number of
shell.
in their
7. Every element in group one has
element in group two has
electron in its outer shell. Every
electrons in its outer shell.
8. Hydrogen is special because it can act like two groups,
and
9. Hydrogen sometimes is
electron.
an electron and sometimes it has an
electrons in its outer shell, it is grouped
10. Although helium has only
with elements that have
elements. They each
11. The green elements on this table are called
have two electrons in their outer shell.
Answer:
8bfdyg8oea
Explanation:
Final answer:
Periods on the periodic table are horizontal rows that reflect the number of electron shells of elements, which range from 1 to 7. As you move across a period, the number of electrons increases. In contrast, groups are vertical columns where elements share the same number of valence electrons, leading to similar chemical properties.
Explanation:
In the context of the periodic table, periods are horizontal rows that define the arrangement of elements. These periods range from left to right and are numbered 1 through 7, starting at the top of the table. Periods indicate the number of electron shells an element has, with each period beginning when a new principal energy level commences to fill with electrons. For instance, period 1 has only two elements: hydrogen and helium. Other periods have more elements, reflecting additional electrons filling the subsequent principal energy levels.
The elements within a period have the same number of electron shells, but as you move from left to right across the table, the number of electrons in the outer shell increases for the elements. This progression affects their chemical and physical properties. When it comes to groups, the vertical columns of the periodic table, elements in the same group have identical numbers of electrons in their valence shell, contributing to similar chemical behavior.
how did advances in technology influence the development of the microscope/ check all that apply
Answer:
New technology allowed microscopes to make it easier to view things that had never been seen before, such as cells.
Explanation:
Answer:
BCDE
Explanation:
Select the temperature scale that matches each boiling point for water. Water boils at 373 . Water boils at 100 . Water boils at 212
degrees Celsius
Degree Fahrenheit
Kelvins
Answer:
100 degree Celsius
373 Kelvin
212 Fahrenheit
Explanation:
The boiling point of water on celsius scale is 100 degree C.
Convert 100 degree C into kelvin
C = K - 273
100 degree C = 100 + 273 = 373 K
Convert 100 degree C into degree F
C = 5 / 9 ( F - 32)
F = 9 / 5 x 100 + 32 = 212
Water boils at 373
✔ kelvins
.
Water boils at 100
✔ degrees Celsius
.
Water boils at 212
✔ degrees Fahrenheit
.
What is the resultant acceleration?
A option is the right option
Answer: The sum of all the acceleration vectors. Hope this helps. :)
Explanation:
The forensic examiner tells the detective that he thinks the body was killed in the country before they found it in New York what type of evidence the need to get to tha conclusion
Dirt samples from clothing to anikise the types then match to the soil of hypothetical location
The table indicates that nitrogen and oxygen are the main components of the atmosphere by volume. Together these two gases make up approximately 99% of the dry atmosphere. Why are these gases important?
A) They are essential to life on Earth.
B) They have a great influence on climate.
C) They absorb ultraviolet radiation from the sun.
D) They increased over time causing global warming.
Answer:
the answer is A. they are essential to life on Earth
Explanation:
Answer: the answer is a
Explanation:
because that is how we live
One of the two places where air enters your body
The answer is Your mouth or nose
Answer ======= the mouth/nose.
Which represents a longitudinal wave?
the motion of a spring
the motion of a shaking rope
the motion of a tight rubber band
the motion of an ocean wave
In longitudinal waves, the vibration or oscillation is parallel to the propagation direction of the wave itself . These disturbances are due to the successive compressions of the medium, where the particles move back and forth in the same direction as the wave.
This means, the closer together the particles are, the greater the amplitude of the wave. This is because of the distance between particles of the medium that is being compresed by the perturbation.
In this sense, the best example is the motion of a spring, since the air particles that are around the spring coil will oscillate in the same direction in which the waves propagate.
Answer: The motion of spring
Explanation: because the motion of spring represents a longitudinal wave
A lightbulb has a resistance of 195 Ω and carries a current of 0.62 A.
The power rating of the lightbulb, to the nearest whole number, is
______ W.
Answer:
75
Explanation:
Power is current times voltage:
P = IV
Voltage is current times resistance:
V = IR
Therefore:
P = I²R
Given I = 0.62 A and R = 195 Ω:
P = (0.62 A)² (195 Ω)
P ≈ 75 W
A positive charge of +0.300 c moves horizontally due +x at speed of 250 m/s. It entered a magnetic field direction of -y with a magnitude of 0.400 T. What is the magnitude and direction of the force on the charge?
Answer: The direction of the magnetic field of a large magnet is toward you. ... Q: 650 kg cart is moving along a roller coaster track at 3.50 m/s at ... Q: Lab 8- Magnetic Fields: solenoids, forces on charged particles and ..... Q: Problem 7 A uniform magnetic field of magnitude 0.173 T is directed along the positive x axis.
Explanation:
The magnitude and direction of the force on the charge will be 30 N towards the +x direction.
What is Lorentz force?Lorentz's force is defined as the force acting on a point charge when it is moving in an electric and magnetic field. Under the electric and magnetic field, a force is to act on the charge, known as the Lorentz force.
The given data in the problem is ;
q is the value of charge = +0.300 c
B is the magnetic field strength = 0.400 T.
v is the velocity of moving charge = 250 m/s.
Mathematically, the Lorentz force is given by;
[tex]\rm F=qvB \\\\ F= 0.300 \times 250 \times 0.400 \\\\ F= 30 \ N[/tex]
Hence, the magnitude and direction of the force on the charge will be 30 N towards the +x direction.
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Calculate the current through R2.
Calculate the current through R1.
Calculate the potential drop across R2.
Calculate the total power developed in the circuit.
Calculate the total resistance.
Calculate the potential drop across R1.
Answer:
The total resistance is 15 Ω, the total current is 1A, The potential drop in R1 and R2 are 10V and 5V respectively and the total power develped is 15 W.
Explanation:
First it is necessary to simplify the circuit. We can do this by calculating the total or equivalent resistance Re. For series resistance arrangement, Re is computed as:
RT = R1 + R2 = 5 Ω + 10 Ω = 15 Ω
According to Ohm’s law the total current can be calculated dividing the total voltage V by Re:
I = V/Re = 15V/15Ω = 1A
This current will be the same current through R1 and R2. Then we can compute the potential drop across R2 multiplying the current across R1 by the resistance:
VR1 = I*R2 = 1 A * 10 Ω = 10 V
The potential drop across R2 is obtained in the same way as R1, considering R2 resistance:
VR2 = I*R1 = 1 A * 5Ω = 5 V
The total power could be calculated multiplying the total current I by the total voltage:
P = I*V = 1 A * 15 V = 15 W
Calculations related to the flow of current, potential drop, power and total resistance in a circuit can be determined through the application of Ohm's Law and Power formulas. Specific values are needed for exact calculations.
Explanation:In order to calculate the current, potential drop, total power developed, and total resistance in a circuit, we first need to understand some basic physics concepts. The current passing through a resistor, like R1 or R2, can be calculated using Ohm's Law, which states: Current (I) = voltage (V) / resistance (R). Similarly, the potential drop across a resistor can also be determined using Ohm's law: Potential Drop = Current * Resistance. Lastly, total power developed in a circuit can be determined using the formula: Power (P) = Voltage * Current, and total resistance can be obtained using the appropriate formula based on whether the resistors are connected in series or in parallel. Without specific values provided for voltage, resistance, or current, exact calculations cannot be done here.
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A wave has a wavelength of 3.3m and a speed of 5.6m/s . What is the frequency of this wave?
Frequency = (speed) / (wavelength)
Frequency = (5.6 m/s) / (3.3 m)
Frequency = (5.6 / 3.3) per sec
Frequency = 1.7 Hz
The magnetic field around a current carrying wire at a distance of 1cm is twice as strong as 2cm . How does the Ford strength at 0.5cm compare to the field strength at 1cm
Answer:
It is half the field strength at 0.5cm
Explanation:
Final answer:
The magnetic field at 0.5 cm from a current-carrying wire would be twice as strong as the field at 1 cm, based on the inverse proportional relationship between magnetic field strength and distance from the wire.
Explanation:
The magnetic field strength around a current-carrying wire follows an inverse relationship with distance, meaning as the distance from the wire increases, the magnetic field strength decreases.
Since the magnetic field at 1 cm is twice as strong as at 2 cm, we can conclude that the field follows an inverse proportional relationship with distance in this region (ignoring the complex equations at very close distances). Therefore, at half the distance from the wire (0.5 cm), the field strength would be twice as much compared to at 1 cm. This is because if doubling the distance (from 1 cm to 2 cm) halves the field, then halving the distance (from 1 cm to 0.5 cm) should double the field strength.