Explanation : According to the law, it says that F ∝ Mm ÷ R²
Where :
F = Gravitational forceM = Mass of the first bodym = mass of the second bodyR = Distance between the 2 bodiesFor calculating the gravitational force (F), we must have an equation. According to the law, we are ain't getting any equation. Hence, we must convert it by putting a constant.
A constant is any value that is fixed, and it won't change under any circumstance. And in this case, the value of the gravitational constant (G) is 6.67 x 10⁻¹¹.
Now, here comes the final equation : F = GMm ÷ R²
Where :
F = Gravitational forceG = Gravitational constant (6.67 x 10⁻¹¹)M = Mass of the first bodym = Mass of the second bodyR = Distance between the 2 bodiesHence, the main purpose of the universal gravitational constant (G) is to have an equation, which is F = GMm ÷ R².
A 0.150 kg ball on the end of a 1.10 m long cord (negligible mass)is swung in a vertical circle..
(a) what is the minimum speed the ball must have at the top of its arc so that the ball continues moving in a circle?
calculate the tension in the cord at the bottom of the arc assuming the ball is moving at twice the speed of part (a) ...?
Answer:
[tex]v = 3.28 m/s[/tex]
Explanation:
At the top position of the arc if ball continue in its circular path then we can say that tension force must be zero at that position for the minimum value of the speed.
So we will have
[tex]T + mg = \frac{mv^2}{R}[/tex]
so if minimum speed is required to complete the circle T = 0
[tex]0 + mg = \frac{mv^2}{R}[/tex]
so we will have
[tex]v = \sqrt{Rg}[/tex]
again we will have
[tex]v = \sqrt{1.10\times 9.81}[/tex]
[tex]v = 3.28 m/s[/tex]
A group of atoms with aligned magnetic poles are known as which of the following?
A. current
B. poles
C. domains
D. fields ...?
Answer:
The correct answer is option C. "domains".
Explanation:
The regions within a magnet at which the magnetization is in a uniform direction are known as magnetic domains. These domains are group of atoms with aligned magnetic poles, this means that the magnetic moments of the atoms are aligned and that their point to the same direction. The magnetic domains are the ones that give the magnetic behavior of ferromagnetic materials.
The strength of the force of gravity depends on a. the masses of the objects and their speeds. b. the masses of the objects and the distance between them. c. the weight of the objects and their speeds. d. the masses of the objects and their weights.
Frequency is measured in units called?
The frequency of a wave is the inverse of time period. Hence, its unit is s⁻¹ which is equivalent to Hz unit. The standard unit of frequency is Hz.
What is frequency ?Frequency of an event is the number of cycles of that event per unit time. For a wave frequency is the number of wave cycles per second. Hence, frequency is the inverse of time period.
Frequency of a wave is directly proportional to the energy of the wave and inversely proportional to the wavelength. Hence, the high frequency waves are shorter waves.
The unit of frequency is called Hertz (Hz) which is equal to s⁻¹ because, it is the frequency is inverse of the time period of the wave. Therefore, frequency is measured in units called Hertz.
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Which of the following statements is true for a cell placed in beaker containing an isotonic solution?
Select one of the options below as your answer:
A.
Water molecules flow from the cell into the beaker.
B.
Water molecules flow from the beaker into the cell.
C.
Water molecules flow in both directions at the same rate.
D.
There is no movement of water molecules.
....i dont even know how to nswer this one becasue i dont know wht and isotonic solution means
The gravitational force between the Sun (mass = 1.99 × 1030 kg) and Mercury (mass = 3.30 × 1023 kg) is 8.99 × 1021 N. How far is Mercury from the Sun?
Answer : Distance, d=6.98 × 10⁷ Km
Explanation :
Given that,
Mass of the sun, m₁ = 1.99 × 10³⁰ kg
Mass of Mercury, m₂ = 3.30 × 10²³ kg
Gravitational force between the sun and mercury, F = 8.99 × 10²¹ N
According to Universal law of gravitation,
[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]
d is the distance of mercury from the sun
[tex]d=\sqrt{\dfrac{Gm_1m_2}{F}}[/tex]
[tex]d=\sqrt{\dfrac{6.67\times 10^{-11}\times 1.99\times {30}\times 3.30\times 10^{23}}{8.99\times 10^{21}}}[/tex]
[tex]d=\sqrt{4.87\times 10^{21}} m[/tex]
[tex]d=6.98\times 10^{10}\ m[/tex]
or
[tex]d=6.98\times 10^{7}\ Km[/tex]
So, mercury is [tex]6.98\times 10^{7}\ Km[/tex] far from the sun.
A 95 kg fullback, running at 8.2 m/s, collides in midair with a 128 kg defensive tackle moving in the opposite direction. Both players end up with zero speed.
A) What was the change in the fullbacks momentum?
B) What Was the change in the defensive momentum?
C) What was the defensive tackle's original momentum?
D) How fast was the defensive tackle moving origianally? ...?
So,option A)Change in the fullback's momentum:779 kg·m/s,B)Change in the defensive tackle's momentum: -779 kg·m/s,C)Defensive tackle's original momentum:-779 kg·m/s (opposite direction),D)The original speed of the defensive tackle:6.09 m/s.
Understanding Momentum and Collision:
A) Change in the fullback's momentum: Momentum is the product of mass and velocity. For the fullback running at 8.2 m/s with a mass of 95 kg, his initial momentum was 95 kg × 8.2 m/s = 779 kg·m/s. After the collision, since they stop, the fullback's speed is 0 m/s, giving a final momentum of 0 kg·m/s. Therefore, the change in momentum is 779 kg·m/s - 0 kg·m/s = 779 kg·m/s.
B) Change in the defensive tackle's momentum: The defensive tackle has mass 128 kg and final speed 0 m/s. Since we are not given the initial velocity, we cannot calculate the change directly; however, by conservation of momentum, the change will be equal and opposite to the fullback's, which is -779 kg·m/s.
C) Defensive tackle's original momentum: As mentioned above, the change in momentum is the negative of the fullback's, so if the fullback's momentum decreased by 779 kg·m/s, the tackle's momentum increased by this amount, meaning it was -779 kg·m/s (opposite direction).
D) The original speed of the defensive tackle: To find the original speed, we take the original momentum (from C) and divide by the tackle's mass. This gives us -779 kg·m/s ÷ 128 kg = -6.09 m/s. The negative indicates that he was moving in the opposite direction to the fullback.
Note that 'negative' here is used to indicate direction in one-dimensional motion, and the actual speed is just the absolute value, 6.09 m/s.
a 727 jet needs to attain a speed of 200 mph to take off. if it can accelerate from 0 to 200 mph in 30 seconds, how long must the runway be? (assume constant acceleration) ...?
Using the equations of motion, the length of the runway required for the 727 jet to take off can be determined. By calculating the acceleration and using the distance formula, we find that the runway must be at least 44.7039 meters long.
Explanation:To determine the length of the runway required for the 727 jet to take off, we can use the equations of motion.
First, convert the speed from mph to m/s: 1 mph = 0.44704 m/s.Next, calculate the acceleration of the jet using the formula:acceleration = change in velocity / timeGiven: final velocity = 200 mph = 200 * 0.44704 = 89.408 m/sInitial velocity = 0 m/sTime = 30 secondsacceleration = (89.408 - 0) / 30 = 2.98027 m/s².Finally, use the equation:distance = initial velocity * time + (1/2) * acceleration * time²Given: initial velocity = 0 m/sacceleration = 2.98027 m/s²time = 30 secondsdistance = 0 * 30 + (1/2) * 2.98027 * (30)² = 0 + 44.7039 = 44.7039 metersTherefore, the runway must be at least 44.7039 meters long for the 727 jet to take off.
Cindy runs 2 kilometers every morning. She takes 2 minutes for the first 250 meters, 4 minutes for the next 1,000 meters, 1 minute for the next 350 meters, and 3 minutes for the rest.
Cindy’s average speed for the entire run is __ meters per minute. One kilometer is the same as 1,000 meters.
Hint: Average Speed = Total Distance/Total Time
It's 200 on Edmentum
can someone check my answer thanks ! 2.The ability to do work or cause change is called A.velocity. B.energy.(I PICK B.) C.transfer. D.friction. 3.Which type of energy is demonstrated by a person jogging?
A.electrical energy B.nuclear energy C.electromagnetic energy D.kinetic energy(I PICK D) 4.Which is the type of energy available in food? A.electromagnetic B.gravitational C.chemical(I PICK C) D.kinetic 5.Dan does 188.0 J of work raking leaves. If the rake does 128.0 J of work, what is the efficiency of the rake?
A.68.1 percent(I PICK A) B.147.0 percent C.60.0 percent D.316.0 percent 6.Which type of energy transformation is taking place when natural gas is used to heat water?
A.chemical energy into thermal energy(I PICK A) B.thermal energy into mechanical energy C.mechanical energy into electromagnetic energy D.electromagnetic energy into chemical energy 7.The energy associated with the motion and position of an object is called
A.kinetic energy. B.potential energy. C.gravitational potential energy. D.mechanical energy.(I PICK D) ****I ACTUALLY HAD 2 CHOICES FOR 7 SO MY OTHER ANSWER IS A*****
Answer:
2. B. energy
3. D.kinetic energy
4. C. chemical
5. A.68.1 percent
6. A.chemical energy into thermal energy
7. D.mechanical energy
Explanation:
2. Energy is the ability of matter to produce work in the form of movement, light, heat, etc.
3. The kinetic energy of a body is that energy it possesses due to its movement.
4 .Chemical energy is the energy stored in the bonds of chemical compounds (atoms and molecules).
5. Efficiency can be calculated as (128J/188J)*100= 68%
6. Chemical energy is defined in item 4 and thermal energy is a type of energy that bodies possess when exposed to the effect of heat. It is precisely what produces that the atoms that make up the molecules are in constant motion either moving or vibrating.
7. Mechanical energy is the energy that bodies present because of their movement (kinetic energy), and their situation with respect to another body, usually the earth.
All your selected answers are correct. The ability to do work is energy, a person jogging has kinetic energy, energy in food is chemical, the rake has 68.1 percent efficiency, natural gas heating water is a chemical to thermal energy transformation process, and motion and position of an object relate to mechanical energy.
Explanation:Yes, you are correct with your answers. The ability to do work or cause change is indeed called B.energy. A person jogging demonstrates D.kinetic energy as they are in motion. The type of energy available in food is C.chemical energy which is stored and can be transformed into other energy forms our body needs. With the work done raking leaves, if Dan does 188.0 J of work and the rake itself does 128.0 J of work then the efficiency of the rake would be (128.0 / 188.0) * 100 = 68.1 percent, hence, it is A.68.1 percent. The transformation of energy taking place when natural gas is used to heat water is A. Chemical energy into thermal energy. Finally, the energy associated with the motion and position of an object falls under D. mechanical energy, although if considering only the motion aspect, it is indeed A. Kinetic energy.
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In an electrical circuit, which of the following controls whether or not electrons flow through the circuit?
What happens to light that shines on an object but is not transmitted?
A. It is scattered or refracted.
B. It is polarized or absorbed.
C. It is reflected or refracted.
D. It is reflected or absorbed.
If you know the components of a vector, what mathematical relationship can be used to find the magnitude of the vector?
Which of the following is a difference between a mercury barometer and an aneroid barometer?
a. The mercury barometer is smaller
b. The mercury barometer can provide a continuous record of pressure changes
c. The aneroid barometer does not use mercury to measure pressure changes
d. The aneroid barometer is not as portable
The key difference between a mercury and an aneroid barometer is that an aneroid barometer does not use mercury to measure pressure changes, instead utilizing a mechanical metal chamber that expands and contracts in response to atmospheric pressure.
An aneroid barometer measures pressure changes without the need of mercury, which is how it differs from a mercury barometer. A mercury barometer consists of a glass tube filled with mercury, measuring atmospheric pressure by the height of the mercury column. In contrast, an aneroid barometer uses a sealed, evacuated and flexible metal chamber known as an aneroid cell, which expands and contracts with atmospheric pressure changes. These mechanical movements are then translated into pressure readings.
Comparatively speaking, the statement 'The aneroid barometer does not use mercury to measure pressure changes' is the correct difference between the two types of barometers. Therefore, the answer to the student's question is option (c).
Barometers using water are impractical because they would need to be extremely tall, over 30 feet, due to water's lower density compared to mercury, which allows for a more compact design in mercury barometers.
The formula for degrees Celsius is: C = 5/9 (F − 32), where F stands for degrees Fahrenheit.
Part 1: Solve the equation for F and show all steps.
Part 2: Determine how many degrees Fahrenheit 20 degrees Celsius is.
To solve for F in the conversion formula, multiply both sides by 9/5 followed by adding 32 to isolate F. When converting 20 degrees Celsius using the formula, the result is 68 degrees Fahrenheit.
Part 1: Solving the equation for F
To solve the equation C = 5/9 (F - 32) for F, perform the following steps:
Multiply both sides by 9/5 to get rid of the fraction on the right side: 9/5 × C = F - 32.
Add 32 to both sides of the equation to isolate F on one side: 9/5 × C + 32 = F.
Part 2: Converting 20 degrees Celsius to Fahrenheit
To find out how many degrees Fahrenheit 20 degrees Celsius is, plug 20 into the rearranged equation:
F = (9/5) × 20 + 32.
Therefore, F = 36 + 32 = 68 degrees Fahrenheit.
The waves with the lowest energy and lowest frequencies of the electromagnetic spectrum are the
a. x rays.
b. radio waves.
c. microwaves.
d. gamma rays.
Gas is confined in a tank at a pressure of 11.0 atm and a temperature of 25.0 degrees C. If two-thirds of the gas is withdrawn and the temperature is raised to 75.0 degrees C, what is the new pressure of the gas remaining in the tank?
Please help!
Which of the following processes is most affected by pressure?
A. freezing
B. boiling
C. melting Which of the following processes is most affected by pressure?
A. freezing
B. boiling
C. melting
Answer:
The answer is: B. boiling.
Explanation:
The value of the melting and boiling points are affected by the value of the atmospheric pressure.
The Celsius degree is the unit corresponding to the melting and boiling temperatures of water at 1 atm pressure. Celsius: Melting 0 ℃, Boil 100 ℃.
When a food is frozen at normal atmospheric pressure, its temperature drops to 0 ° C, at which time the water begins to turn into ice.
Normally, the atmospheric pressure that exists at sea level is taken as a reference. There it takes a value of 1 atmosphere.
Therefore, although the pressure is 1 atmosphere for all processes, the one that needs more temperature is the Boiling, which is 100 ° C.
The answer is: B. boiling.
Felipe drives his car at a velocity of 28 m/s. He applies the brake, which slows the vehicle down at a rate of 6.4 m/s2 and causes it to slow to a stop. How long does it take for the car to stop? Round your answer to the nearest tenth.
I'm supposed to use derived formulas to find the answer but I don't know which one to use.
Why is a protective apron or lab coat important to use when working with acids?
Answer:
c
Explanation:
At the beginning of a basketball game, a referee tosses the ball straight up with a speed of 4.6 m/s. A player cannot touch the ball until after it reaches its max height and begins to fall down. What is the minimum time that a player must wait before touching the ball?
Final answer:
The minimum time a player must wait before touching the basketball after it has been tossed straight up by the referee is approximately 0.469 seconds, which is the time taken for the ball to reach its maximum height.
Explanation:
The student is asking about the time it takes for an object (a basketball in this case) to reach its maximum height when thrown vertically upwards. This situation can be analyzed using the equations of motion under constant acceleration due to gravity. Since gravity will be slowing down the ball until it stops and starts falling, we can use the initial velocity and the acceleration due to gravity to find the time taken to reach the maximum height.
Using the equation v = u + at, where v is the final velocity (0 m/s at the maximum height), u is the initial upward velocity (4.6 m/s), a is the acceleration due to gravity (-9.8 [tex]m/s^2[/tex]), and t is the time in seconds, we can solve for t. Here, the negative sign for acceleration indicates that gravity is acting opposite to the direction of the initial velocity.
Substituting the known values, we get:
0 = 4.6 m/s - (9.8 [tex]m/s^2[/tex] × t)
t = 4.6 m/s / 9.8 [tex]m/s^2[/tex]
t = 0.469 seconds (rounded to three decimal places)
This is the time for the ball to reach the peak of its motion. To find the minimum time that a player must wait before touching the ball, we just consider this time, since the ball starts to fall immediately after reaching its maximum height.
Magnetic induction is used for what?
Which is true about atoms?
a.atoms have no mass
b.atoms are mostly empty space
c.most of the space in an atom is taken up by the nucleus?
While skiing, Ellen encounters a ledge that sends her flying horizontally at a rate of 12 m/s. How far away will she land if the ledge is 7 meters high? ...?
What is the difference between stretching a t shirt and stretching a rubber band?
A wave has a wavelength of 45 meters and a period of 9.0 seconds. What is the frequency of the wave?
Answer: The correct answer is 0.11 Hz.
Explanation:
The relation between frequency of the wave and time period is as follows;
[tex]f=\frac{1}{T}[/tex]
Here, f is the frequency of the wave and T is the time period.
Here, the frequency is inversely proportional to the time period.
It is given in the problem that a wave has a wavelength of 45 meters and a period of 9.0 seconds.
Calculate the frequency of the wave.
[tex]f=\frac{1}{T}[/tex]
Put T= 9 s.
[tex]f=\frac{1}{9}[/tex]
f=0.11 Hz
Therefore, the frequency of the wave is 0.11 Hz.
What type of machine is a seesaw?
A.
simple machine
B.
compound machine
Answer: Option (A) is the correct answer.
Explanation:
A seesaw is a simple machine which has a long board and on a fixed part it is balanced in the middle.
For example, a seesaw on which children play in the park is balanced at the middle on a fixed point so that children sitting on both the sides can move up and down with the same force.
Thus, we can conclude that seesaw is a simple machine type of machine.
Seesaw is classified as a simple machine. The correct option is( A)
What is simple machine ?A seesaw is categorized as a basic machine since it functions using the levering principle. One of the six traditional simple machines, together with the inclined plane, wedge, screw, wheel and axle, and pulley is the lever.
The lever in the case of a seesaw is a long, rigid beam that pivots on a fulcrum. A back-and-forth motion is possible because of the effort put in on one end of the seesaw, which forces the other end to rise and fall.
Therefore, The correct option is ( A)
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what is the energy of a photon whose frequency is 5.2 x 10 to the 15th s -1? Cassie(:
physical science help please!
I will up-vote all answers!
The Periodic Table is organized so that atoms of elements with the same number of valence electrons are in __________.
cells
columns
diagonals
rows
Answer:
Columns
Explanation:
The groups are arranged in columns on the Periodic Table.
As we learn more, _________ are often revised. scientific laws scientific theories observation experiments
Answer:
Scientific theories
Explanation: