Answer:
14m/s2
Explanation:
initial velocity=2m/s
final velocity =?
time=4s
acceleration=3.0m/s
v=u+at
v=(2)+(3*4)
v=14m/s
by substituting the values in the equation we get the value 14m/s.
The method of heat transfer by radiation, convention and conduction
Answer:
summary
Conduction is heat transfer through stationary matter by physical contact. ...
Convection is the heat transfer by the macroscopic movement of a fluid. ...
Heat transfer by radiation occurs when microwaves, infrared radiation, visible light, or another form of electromagnetic radiation is emitted or absorbed
Explanation:
21. The number of significant figures in 7316000 are 1 (a)7 (b) 6 (d) 4 (c)5
Answer:
no.7 is answer
Explanation:
because you understand by your self ok
When are hypotheses supported in science? (Site 1).
A hypothesis is said to be a scientific hypothesis. It should be supported by the majority or done through a careful experimentation process. A scientific hypothesis is the main element in the scientific method and experiment.
What is a hypothesis?
The hypothesis is a proposed explanation of the research or a test that has to do in the future.
It is an assumption made before an experiment to get the road map of the research as well as to prove it right through testing and research activities.
It is said to be the theoretical way of a practical solution. A hypothesis is must form before research. It is making for the objective of being tested.
Therefore hypothesis is supported when it is carried out by proper experiment and testing.
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2. A football player kicks a ball with a force of 50N. Find the impulse on the ball if his foot stays in
contact with the football for 0.01s.
a
3.A hockey player applies an average force of 80N to a 0.25kg hockey puck for a time of 0.2s.
Determine the impulse experienced by the hockey puck.
Answer:
you should know
[tex]i = ft[/tex]
where f is an average force.
First Question
i = 50N ×0.01s = 0.5 N•s
Second Question
i = 80N ×0.2s = 16N•s
A 45 kg object has a momentum of 225 kg-m/s northward. What is the object's velocity?
Answer: 5 m/s North
Explanation:
Velocity = Momentum/Mass
Velocity = 225 kg*m/s/45kg
Velocity = 5 m/s North
2. The electrostatic force of attraction between two small spheres that are 1.0 m apart is F. If the distance between the spheres is decreased to 0.5 m, the electrostatic force will then be
The electrostatic force between the two spheres when their distance is decrease to 0.5 m will be 4F
Data obtained from the question Initial distance apart (r₁) = 1 mInitial force (F₁) = FFinal distance apart (r₂) = 0.5 mFinal force (F₂) =? How to determine the final forceFrom Coulomb's law,
F = Kq₁q₂ / r²
Cross multiply
Fr² = Kq₁q₂
Kq₁q₂ = constant
F₁r₁² = F₂r₂²
With the above formula, we can obtain the final force as follow:
F₁r₁² = F₂r₂²
F × 1² = F₂ × 0.5²
F = F₂ × 0.25
Divide both side by 0.25
F₂ = F / 0.25
F₂ = 4F
Thus, we can conclude that the final force will increase by a factor of 4
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WILL GIVE BRAINLIEST !!!
Which measurement shows the largest volume? (1 ml = 1 cm^3)
A)27 cm
B)25cm
C) 801mL
D)2L
Answer:
D) 2L. two liters......
A circus performer walks a tightrope 315 m above the ground. Suppose a coin falls from his pocket during his walk. How much potential energy does the coin (m = 0.015 kg) have when its speed is 60.0m/s?
The potential energy of the coin is mathematically given as
P.E=26.99949J
Potential energy of coinQuestion Parameters:
A circus performer walks a tightrope 315 m above the ground.
(m = 0.015 kg) have when its speed is 60.0m/s
Generally the equation for the Newtons equation is mathematically given as
v 2 - u 2 =2aS
Therefore
S = [ v 2 - u2 ] / 2a
S = [ 60-0 ] / 2*9.8
S= 183.67 m
Therefore,P.E
P.E=mgh
hence
P.E=0.015*9.8*183.67
P.E=26.99949J
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What do scientists use to study the patterns and impacts of climate change over time?
A. all of the above
B. tree rings and ice formed thousands of years ago
C. fossilized pollen and tree rings
D. chemical isotopes in foraminifera shells and fossilized pollen
Scientists use the following to study the patterns and impacts of climate change over time :
Tree rings and ice formed thousands of years agoFossilized pollen and tree ringsChemical isotopes in foraminifera shells and fossilized pollenWhat is Climate?
This is defined as the atmospheric condition of a place over a long period of time.
Scientists use physical, chemical and biological methods to study impacts of climate change which makes option A the most appropriate.
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please answer correctly and ill give branliest
5) Spinning blades may injure or kill aquatic species.
6) During high tide, the ocean's waters creep up the shore, deepening the water. This happens as a body of water gets closer to one of the two bulges created by the moon's gravitational force
Nina O'Brień of the US competes in the Giant Slalom. The vertical drop is 424
meters, and took Nina 58.81 seconds to complete the course. What is her
average speed?
please help A 10 kg box initially at rest is pulled with a 50 N horizontal force for 4 m across a level surface. The force of friction acting on the box is a constant 20 N. How much work is done by the gravitational force?
A. 100 J
B. 0 J
C. 10 J
D. 50 J
The box is being pulled horizontally, so any work done on the box must be done by forces that are parallel to the ground. But gravity always points downward, which is perpendicular to the surface in this case, so the gravitational force performs B. 0 J of work.
A cylindrical tank with radius 5 m is being filled with water at a rate of 2 m3/min. How fast is the height of the water increasing?.
V(volume of cylinder) = A.h = πr².h
V = 25π.h m³
rate (Q) = V : t
[tex]\tt t=\dfrac{V}{Q}=\dfrac{25\pi h~m^3}{2~m^3/min}=12.5\pi h~min[/tex]
Please define parameters
Answer:
a numerical or other measurable factor forming one of a set that defines a system or sets the conditions of its operation.
Answer: A variable for which the range of possible values identifies a collection of distinct cases in a problem.
Explanation: A numerical or other measurable factor forming one of a set that defines a system or sets the conditions of its operation.
For example: "the transmission will not let you downshift unless your speed is within the lower gear's parameters".
A few alpha particles bounce off a thin sheet of gold foil. What did scientists
inter about atoms from this experimental result?
O A Atoms are made up of smaller particles.
2. Atoms of different elements are composed differently.
O C. Atoms have a dense, positively charged center
D. Electrons have more energy the farther they are from the nucleus.
Answer:
I world say A is the answer 80% sure
A polymerization process is used to create a synthetic rubber material known as styrene butadiene copolymer. Explain the difference between a chemical formula and a chemical equation, using this copolymer as an example.
Answer:
the picture is so blured can you type it in comment i will wait:(
Milan is measuring the density of ethanol. He weighs a bottle three times:
first, empty; then filled with water; then filled with ethanol. Here are his
results:
mass of empty bottle = 30.0g
mass of bottle filled with water = 90.0g
mass of bottle filled with ethanol = = 78.0g
i Calculate the volume of the bottle.
[tex]\\ \tt\hookrightarrow Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \tt\hookrightarrow Volume=\dfrac{Mass}{Density}[/tex]
[tex]\\ \tt\hookrightarrow volume=\dfrac{48}{0.789}[/tex]
[tex]\\ \tt\hookrightarrow Volume=68.83cm^3[/tex]
Density of ethanol[tex]=0.789g/cm^3[/tex]
Mass of ethanol[tex]=78-30=48g[/tex]
[tex]Density = \frac{Mass}{Volume} [/tex]
[tex]Volume = \frac{Mass}{Density}[/tex]
[tex]Volume = \frac{48}{0.789}[/tex]
[tex]Volume = 68.83cm³[/tex]
help please, this is unit about work, power, force in physics.
Thermodynamics
Heat engines were first envisioned and built during the Industrial Revolution. Explain the thermodynamics of a heat engine, commenting on its efficiency.
Answer:
A heat engine is a device that converts internal energy into work. Internal energy is increased by the addition of heat. The efficiency of a heat engine is a measurement of how efficiently it works. Efficiency compares the amount of useful energy extracted from a process to the total energy input. The heat engine will be more efficient if the percentage is higher.
Explanation:
Choose the word to fill in the blank, which best completes the sentence. Light entering a clear glass prism. A rainbow exits the prism on the opposite side. Prisms made of glass will ________ light and create colored rainbows on a wall, as is shown in the image above. A. Transmit c. Refract b. Transfer d. Absorb Please select the best answer from the choices provided A B C D.
Answer:c. Refract
When light splits into multiple colours by a prism, it is called refraction.
Answer:ccccccccccccc or refract
Explanation:truuust lol
Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 400 mA, then the current through the second diode is _____ mA.
The current in the second diode is 400mA
Data;
First Voltage = 0.75VSecond Voltage = 0.8VFirst Current (I) = 400mASecond Current(I) = ?Current In a SeriesThe current in the first diode is equal to 400mA. In a series circuit, the current passing the diodes are equal. This implies that the current in the series are equal.
Diodes connected in series will be the equal.
[tex]I_1 = I_2[/tex]
Since I1 is 400mA, I2 will be equal to 400mA
[tex]I_1 = I_2\\I_1 = 400mA\\I_2 = 400mA[/tex]
The current in the second diode is 400mA
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Initial State: A mountain climber stands at the bottom of a tall cliff.
Final State: A mountain climber stands at the top of the tall cliff.
Notes: The system includes the mountain climber and earth. The mountain climber uses the rock outcroppings to slowly climb the cliff.
Directions: Move the arrows to adjust the bar heights. Show the direction of the energy transfer (if any). Adjust energy transfer afterwards
Energy is transformed from potential to kinetic energy a s the climber climbs the mountain.
What is energy transformation?Energy transformation involves the change in the form of energy from one form to another according to the law of thermodynamics.
At the bottom of the mountain, the mountain climber has potential energy. The potential energy decreases and transforms to kinetic energy as he climbs the mountain. Maximum potential energy is attained again at the top of the mountain.
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Who is known as the "father of modern chemistry” because he first organized all known elements into four different groups?
Answer:
Antoine Lavoisier
Explanation:
calculate the deceleration of the car
Answer:
C
Explanation:
Answer:
i think the answer is a because of division
Explanation:
Please help me with this question
Answer:
5m
Explanation:
the amplitude of a wave is basically if you cut the wave in half horizontally and went from the half point to either the lowest or highest point of the wave. and the midpoint of wave A is 0 and u can either go up 5 to get to the highest point, or down 5 to get to the lowest point (;
Can someone please help me I need it fast
Answer:
The Earth has different compositional and mechanical layers. Compositional layers are determined by their components, while mechanical layers are determined by their physical properties.
the first periodic table of elements mandeleev created contained only 45 elements. true or false
Answer:
false
Explanation:
how could a scale be used to measure magnetic force
Answer:
The magnetic pull strength is measured by using the calibrated scale and a ferrous test piece to determine the breakaway force, typically measured in pounds or ounces. (I don't take credit for this answer)
Explanation:
A crate of mass 50kg is pushed along a floor with a force of 20N for a distance of
5m. Calculate the work done.
Answer:
F=50kg
D=5m
W=FD
therefore work done is 250Nm
The work done will be 100 J. It is obtained as the product of the force and displacement.
What is work done?Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work may be zero, positive and negative.it depends on the direction of the body displaced. if the body is displaced in the same direction of the force it will be positive.
The given data in the problem is;
m is the mass of the crate = 50 kg
F is the force of 20 N
d is the distance = 5 m
W is the work done.
[tex]\rm W =F \times d \\\\ \rm W =20 \times 5 \\\\ W= 100 \ J[/tex]
Hence the work done will be 100 J.
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Thermal energy can be converted into motion by which of the following devices?
A.Microwave oven
B.Solar panel
C.Steam engine
D.Electric toaster