A car goes from rest to a speed of 90 km/h in 10 seconds . What is the car's acceleration in m/s²
What is the equivalent resistance in a parallel circuit that has the following three resistors: 6.8 ohms, 9.0 ohms, and 15.0 ohms? . A.. 10.3 ohms. B.. 30.8 ohms. C.. 3.08 ohms. D.. 0.80 ohms. E.. 12.8 ohms
A train is slowing down with an average acceleration of −5.0 m/s2 (negative sign shows deceleration). If its initial velocity is 50. m/s, how far does it travel in 6.0 seconds?
Answer:
the train travels 210 m
Explanation:
Kinematics equations of motion
[tex]vf=vi+a*t[/tex], equation(1)
[tex]vf^{2} =vi^{2} +2*a*d[/tex] equation(2)
Vi= initial velocity (m/s)
Vf= final velocity (m/s)
a = acceleration [tex]m/s^{2}[/tex]
d= traveling distance (m)
known information:
vi=50m/s
a=-5[tex]m/s^{2}[/tex]
t=6 s
Calculation of the final speed replacing the information known in the equation 1
[tex]vf=50-5*6[/tex]
[tex]vf=50-30=20m/s[/tex]
Calculation of the distance replacing the information known and the final velocity in the equation 2
[tex]20^{2} =50^{2} -2*5*d\\400= 2500-10d\\10d=2500-400\\d=2100/d\\d=210m[/tex]
A space shuttle is in orbit about the earth at an altitude where the acceleration due to gravity is 8.70 m/s2. What is the shuttle's speed at this altitude?
2.65 × 10 3 m/s
7.45 × 10 3 m/s
7.68 × 10 3 m/s
7.91 × 10 3 m/s
Which steps are important when designing and conducting a scientific experiment?
Answer:
Identify the independent variable and address any confounndations variables
Explanation:
A pebble is thrown horizontally with an initial velocity of 12m/s to the right. How long does it take to fall 34 meters
Ganymede is one of the many moons of Jupiter. It is nearly spherical in shape. It is larger than the planet Mercury and slightly smaller than the planet Mars. If it is so large compared with the bodies around it, why is it called a moon and not a planet?
Answer:
C. It moves in an orbit around Jupiter.
Explanation:
What fact does Einstein's equation E = mc2 describe?
Emission of light from an atom occurs when the electron:
Answer: this happens when the atom drops from a higher to a lower energy level
Explanation:
The emission of light from an atom occurs when an electron is from a higher to a lower energy level.
What are electrons?
Electrons are negatively charged particles. Atom is the smallest particle of the molecule. Atoms have positively charged particles called protons. The negatively charged particle is called electrons.
The neutral particle is called the neutron. Electrons rotated in the valence shell. The electrons which are in the last shell are called the valence shell. The electrons in the valence shell move from the last shell to the second shell and then emits energy.
Absorption is the process by which an atom transitions from its ground state to an excited state by absorbing energy from its environment.
After absorbing the energy, the electron advances to a higher energy state. Up the opposite process, called emission, the electron releases the excess energy it had taken in and goes back to its ground state.
Therefore, The emission of light from an atom occurs when an electron is from a higher to a lower energy level.
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The being water held back by a dam possesses which type of energy? A) nuclear energy B) chemical energy C) potential energy D) kinetic energy
Answer: C. potential energy.
Explanation:
C. potential energy.
Water being held back by a dam will immediately rush through once the dam is removed. This is proof of the potential energy possessed by the water.
The being water held back by a dam possesses potential energy.
option C is the correct answer.
What is total energy ?
Total energy of any object under consideration is the sum of potential energy (P.E) and kinetic energy (K.E) and is constant throughout the motion. for example the ball is having maximum potential energy and zero kinetic energy at some finite height and as it is released its K.E increases and is maximum at ground position and P.E decreases and is zero at ground zero level position to have total energy same through out the motion of ball.
It should be noted that :
The energy possessed by a body by virtue of its motion is known as kinetic energy and the energy possessed by a body due to its position or configuration is known as potential energy.
Here, the water being held back by a dam possesses some potential height which implies that water is having Potential energy due to position of water placed away from ground level.
Therefore, water held back by a dam possesses potential energy.
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what happens when a colder drier air mass pushes against a warmer moister air mass
5000 j of heat are added to a system. it does 3500 j of work on the surroundings. what is δe in j?
Final answer:
The change in internal energy (ΔE) of the system is 1500 J, calculated using the first law of thermodynamics with the given 5000 J of heat added to the system and 3500 J of work performed by the system.
Explanation:
When considering the first law of thermodynamics, the change in internal energy (ΔE) of a system is determined by the heat added to the system (Q) and the work done by the system on the surroundings (W). The relationship is given by the equation ΔE = Q - W.
In this scenario, the system receives 5000 J of heat and performs 3500 J of work on its surroundings. Applying the first law, we can calculate the change in internal energy:
ΔE = Q - W = 5000 J - 3500 J = 1500 J
Therefore, the change in the system's internal energy is 1500 J.
True or false cold air can hold more moisture than warm air
a dump truck and a little toy matchbox car have the same velocity. which one has the greater momentum?
A) dumb truck
B) matchbox car
C) they have the same momentum
D) there is no way to tell
What is the average velocity of the particle from rest to 15 seconds?
A.) 1.1 meters/second
B.) 1.2 meters/second
C.) 1.3 meters/second
D.) 1.4 meters/second
Answer : The correct option is, (D) 1.4 meters/second
Solution :
Average velocity : It is defined as the displacement per unit time.
Formula used for average velocity :
[tex]v_{av}=\frac{d}{t}[/tex]
where,
[tex]v_{av}[/tex] = average velocity
d = displacement of the particle
t = time taken
Now put all the given values in the above formula, we get the average velocity of the particle.
[tex]v_{av}=\frac{(21-0)m}{15s}=1.4m/s[/tex]
Therefore, the average velocity of the particle is, 1.4 meter/second.
A ball with a horizontal speed of 1.25 m/s rolls off a bench 1.00 m above the floor. part a how long will it take the ball to hit the floor?
Answer:
The brainliest response is wrong. The correct answer is t= 0.45s.
Explanation:
A parallel-plate capacitor has a plate area of 0.2 m2 and a plate separation of 0.1 mm. to obtain an electric field of 2.0 × 106 v/m between the plates, the magnitude of the charge on each plate should be
The magnitude of the charge on the plates of a parallel-plate capacitor necessary to establish an electric field of 2.0 x 10^6 V/m, with an area of 0.2 m^2 and plate separation of 0.1 mm, would be 4 x 10^5 C.
Explanation:In relation to your question about a parallel-plate capacitor, the electric field (E) between the plates is proportional to the surface charge density, which is defined as the charge (Q) on each plate divided by the area (A) of the plate. By determining the charge on each plate, we use the equation E = Q/A. We can rearrange this equation to find the charge Q = E x A. Substituting the given values: Q = 2.0 x 106 V/m x 0.2 m2, gives us a result of Q = 4 x 105 C. Therefore, to obtain an electric field of 2.0 x 106 V/m between the plates of a parallel-plate capacitor, with a plate area of 0.2 m2 and a plate separation of 0.1 mm, the magnitude of the charge on each plate should be 4 x 105 C.
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The magnitude of the charge on each plate of the capacitor should be 3.54 µC.
To determine the magnitude of the charge on each plate of a parallel-plate capacitor given the electric field and other parameters, follow these steps:
Given:
Plate area [tex](\( A \))[/tex] = 0.2 m²Plate separation [tex](\( d \))[/tex] = 0.1 mm = 0.1 × 10⁻³ m = 0.0001 mElectric field [tex](\( E \))[/tex] = 2.0 × 10⁶ V/mFormulae:
1. Electric Field Relation:
The electric field [tex]\( E \)[/tex] between the plates of a capacitor is given by:
[tex]\[ E = \frac{V}{d} \][/tex]
where [tex]\( V \)[/tex] is the voltage across the plates and [tex]\( d \)[/tex] is the separation between the plates.
Rearranging to find [tex]\( V \)[/tex]:
[tex]\[ V = E \times d \][/tex]
Substituting the given values:
[tex]\[ V = 2.0 \times 10^6 \, \text{V/m} \times 0.0001 \, \text{m} = 200 \, \text{V} \][/tex]
2. Capacitance:
The capacitance [tex]\( C \)[/tex] of a parallel-plate capacitor is given by:
[tex]\[ C = \frac{\varepsilon_0 A}{d} \][/tex]
where [tex]\( \varepsilon_0 \) (the permittivity of free space) is \( 8.854 \times 10^{-12} \, \text{F/m} \)[/tex].
Substituting the given values:
[tex]\[ C = \frac{8.854 \times 10^{-12} \, \text{F/m} \times 0.2 \, \text{m}^2}{0.0001 \, \text{m}} \][/tex]
[tex]\[ C = \frac{1.7708 \times 10^{-12} \, \text{F}}{0.0001} \][/tex]
[tex]\[ C = 1.7708 \times 10^{-8} \, \text{F} = 17.7 \, \text{nF} \][/tex]
3. Charge:
The charge [tex]\( Q \)[/tex] on the capacitor is given by:
[tex]\[ Q = C \times V \][/tex]
Substituting the capacitance and voltage:
[tex]\[ Q = 17.7 \times 10^{-9} \, \text{F} \times 200 \, \text{V} \][/tex]
[tex]\[ Q = 3.54 \times 10^{-6} \, \text{C} = 3.54 \, \text{µC} \][/tex]
on the surface of planet x, a body with a mass of 10 kilograms weighs 40. newtons. the magnitude of the acceleration due to gravity on the surface of planet X is
The acceleration due to gravity of the body is 4 ms-2.
We define the weight of an object as the product of the mass of the object and acceleration due to gravity. The value of the acceleration due to gravity varies from place to place in the universe.
From the information presented in the question;
W = mg
m = 10 kilograms
W = 40 newtons
g = W/m
g = 40 newtons/10 kilograms
g = 4 ms-2
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Does the inertia of an object change as the object’s velocity changes explain
(true or false) electromagnetic energy is the kind created by horseshoe magnets
The statement is false; horseshoe magnets produce magnetic fields, not electromagnetic energy. Electromagnetic energy is transmitted by waves with electric and magnetic fields, such as light and radio waves.
The statement (true or false) electromagnetic energy is the kind created by horseshoe magnets is false. Horseshoe magnets create magnetic fields due to their permanent magnetic properties, not electromagnetic energy. However, when electric current is used to create a magnet, as in an electromagnet, we can say that the magnetic field is created by electrical energy. On the other hand, electromagnetic energy refers to the energy transmitted by electromagnetic waves, which include light, radio waves, and x-rays. These waves have both electric and magnetic field components and carry energy through space, even in the absence of a physical medium.
To understand this better, consider that fields of force, like the ones that occur in the space around magnets, can carry energy across space. This demonstrates that the electromagnetic waves, which are basically vibrations in the electric and magnetic fields, are capable of transporting energy. So, while horseshoe magnets produce magnetic fields, they are not the source of electromagnetic energy in the way that electromagnetic waves are.
How many moles of MgCl2 are there in 315 g of the compound? mol
A longitudinal wave is a type of wave that transfers energy _____ to the direction of wave motion. A transverse wave, on the other hand, is a type of wave that transfers energy _____ to the direction of wave motion.
parallel then perpendicular
In a Longitudinal wave, the direction of the wave motion is parallel to the direction of the energy transfer. The correct blanks are parallel and perpendicular.
Longitudinal wave:
In this direction of the wave motion is parallel to the direction of the energy transfer.It requires a medium to travel.Transverse wave:
In this direction of the wave motion is perpendicular to the direction of the energy transfer.It does not require any medium.Therefore, the correct blanks are parallel and perpendicular.
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A rocket initially at rest on the ground lifts off vertically with a constant acceleration of 2.0 Ã 101 meters per second2 . how long will it take the rocket to reach an altitude of 9.0 Ã 103 meters?
Answer:
Time taken, t = 30 seconds
Explanation:
It is given that,
Initial speed of the rocket, u = 0
It is lifted with a constant acceleration of, [tex]a=2\times 10^1\ m/s^2=20\ m/s^2[/tex]
Height to be attained, [tex]d=9\times 10^3\ m[/tex]
Let t is the time taken by the rocket to reach an altitude of [tex]9\times 10^3\ m[/tex]. Using the second equation of kinematics to find it as :
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
[tex]d=\dfrac{1}{2}at^2[/tex]
[tex]t=\sqrt{\dfrac{2d}{a}}[/tex]
[tex]t=\sqrt{\dfrac{2\times 9\times 10^3}{20}}[/tex]
t = 30 seconds
So, the time taken by the rocket to reach given height is 30 seconds. Hence, this is the required solution.
Which of the examples below is an example of convection? A) rubbing your hands together. B) heating a fish tank. C) basking in the sun. D) striking a match.
the right answer is heating a fish tank.
What is the average acceleration of the particle between 0 seconds and 4 seconds?
The average acceleration of the particle between 0 seconds and 2 seconds is 4 m/s², and it is constant. From 2 seconds to 4 seconds, the particle experiences no acceleration as it moves at a constant velocity.
The question asks about the average acceleration of a particle between 0 seconds and 4 seconds. Since the acceleration is constant and equal to 4 m/s² along the x-direction, this value itself represents the average acceleration over the given time interval. There's no need to perform any additional calculations if the acceleration doesn't change with time, as is the case here.
However, it's important to note that the value of the constant acceleration (4 m/s²) applies only between 0 seconds and 2 seconds, after which the particle travels at constant velocity and the acceleration is zero.
An electrical insulator has
A.electrons tightly bound to its atoms
B.more protons than electrons
C.electrons that freely move
D.negatively charged ions
An electrical insulator has" Electrons tightly bound to its atoms."The correct option is A.
An electrical insulator typically has electrons tightly bound to its atoms. This prevents the electrons from moving freely and thus inhibits the flow of electric current through the material. The lack of mobile electrons is a fundamental property that distinguishes insulators from conductors or semiconductors.
B. more protons than electrons: This option is not true because an electrical insulator can have an equal number of protons and electrons or even more electrons than protons. The balance between protons and electrons does not determine whether a material is an insulator or not.
C. Electrons that freely move: This option is not true for electrical insulators. Insulators are materials that do not conduct electricity easily, and one of the main reasons is that their electrons are tightly bound to their atoms. This lack of electron mobility prevents the easy flow of electric current.
D. Negatively charged ions: This option is not true for electrical insulators in general. Negatively charged ions refer to atoms or molecules that have gained extra electrons and carry a net negative charge. While some insulators may contain negatively charged ions, it is not a defining characteristic of electrical insulators as a whole. The primary characteristic of insulators is the inability to allow the free flow of electrons.
Therefore, The correct answer is option A.
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which of the materials would be able to scratch Quartz
A flatbed truck is carrying a 20.0 kg crate along a level road. the coefficient of static friction between the crate and the bed is 0.400, and the coefficient of kinetic friction is 0.300. what is the maximum acceleration that the truck can have if the crate is to stay in place relative to the truck?
Which of the following is not true?
A) Absolute zero on the Kelvin scale is -273°C.
B) Liquefaction of the gas occurs at approximately -155°C.
C) The gas pressure increases as the temperature decreases.
D) The gas follows a linear relationship between volume and temperature.
The gas pressure increases as the temperature decreases is an incorrect statement. Option C is correct.
What is pressure?The force applied perpendicular to the surface of an item per unit area across which that force is spread is known as pressure.
It is denoted by P. The pressure relative to the ambient pressure is known as gauge pressure.
When you heat a gas, the molecules get more energy and travel quicker. Cooling the molecules, on the other hand, causes them to slow down, lowering the pressure.
The gas pressure increases as the temperature decreases is an incorrect statement.
Hence,option C is correct.
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Final answer:
The statement that is not true among the provided options is C) The gas pressure increases as the temperature decreases, because according to Gay-Lussac's law, the pressure of a gas should decrease as the temperature decreases when volume is held constant.
Explanation:
The question is asking which statement is not true regarding the behavior of gases, absolute zero, and the Kelvin scale.
Statement A) Absolute zero on the Kelvin scale is -273°C is true, because by definition absolute zero corresponds to -273.15°C, which is rounded to -273°C. This is the temperature where an ideal gas would theoretically reach zero volume.
Statement B) Liquefaction of the gas occurs at approximately -155°C is irrelevant to the correctness without additional gas-specific information, since the liquefaction temperature varies for different gases.
Statement C) The gas pressure increases as the temperature decreases is false. According to Gay-Lussac's law, for a given amount of gas at constant volume, the pressure of a gas is directly proportional to its temperature. Therefore, as temperature decreases, the pressure should also decrease assuming volume is held constant, which is not what the statement suggests.
Statement D) The gas follows a linear relationship between volume and temperature is true for an ideal gas. Figures presented in the information confirm that volume and temperature are directly and positively related for a gas following ideal behavior, with the relationship being linear up until liquefaction.
The not true statement among the options is C) The gas pressure increases as the temperature decreases.
You leave a light on in your house for 10 minutes (600 seconds). The lightbulb draws 0.5 amps at 120 volts. What is the power rating of the lightbulb and how much energy is consumed in the 10 minutes?
A) 60 watts and 0.1 joules
B) 60 watts and 36,000 joules
C) 240 watts and 0.4 joules
D) 2400 watts and 144,00 joules
> What is the power rating?
The power rating can actually be calculated by the product of current and volts. Therefore:
Power = I V
Given that current I = 0.5 A and V = 120 volts, therefore:
Power = (0.5 A) (120 V)
Power = 60 Watts
> How much energy is consumed in 10 minutes
Energy is simply the product of power and time in seconds, therefore:
Energy = Power * time
Energy = 60 Watts * (600 seconds)
Energy = 36,000 Joules
B