Newton's first law of motion states that an object remains at rest unless a(n) external force acts on it.
What is Newton's first law of motion?
Newton's first law can be defined as if an object is at rest it remains at rest, or if in motion, remains in motion which has a constant velocity unless acted on by a net external force.
The equation for Newton’s first law is as follows:
F = dp /dt
or
F = d(mv)/dt
In this statement, p is the momentum. As p=mv, the second equation replaces p with mv. V is the object’s velocity, t is the time, and F is for force.
Newton's first law can also be called as the law of inertia because inertia refers to the amount of resistance of an object can be related to a velocity change. Here, Velocity change can be described in terms of the speed of the object or its direction.
When we known with the different part of inertia is the tendency to continue which moves in the same direction line at a constant speed when no forces act on them. Thus, it can be described as an object remains at rest unless an external force acts on it.
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Final answer:
Newton's first law of motion, or the law of inertia, indicates that an object at rest stays at rest and an object in motion maintains its velocity unless acted on by a net external force.
Explanation:
Newton's first law of motion, also known as the law of inertia, states that an object remains at rest or if in motion, continues to move at a constant velocity unless acted upon by a net external force. This principle explains why an object will not change its state of motion unless a force is applied to it. For example, a soccer ball on the ground will not move until a player kicks it, applying a net external force to overcome its inertia.
The space shuttle travels at about 28,000 km per hour. Using that information, estimate how many hours it will take the shuttle to reach Saturn from Earth. Show your work. Convert your answer into scientific notation if necessary.
Increasing the mass attached to a spring will increase its vibrational period.
True or false? ...?
What net force is required to accelerate a car at a rate of 2 m/s2 if the car has a mass of 3,000 kg?
A 1430 kg car speeds up from 7.5 m/s to 11 m/s in 9.3 s. Ignoring friction, how much power did that require?
if you had a trapped gas and continued to cool it until the lowest possible temperature is reached the temperature is called
Answer:
Absolute Zero
Explanation:
The lowest limit of thermodynamic temperature is called as absolute zero. By international agreement, on kelvin scale it is 0 K and on Celsius scale it is equal to -273.15° C. This is considered as the lowest possible temperature. At this temperature the particle vibration is minimum and no heat energy remain in the substance.
What does a calorimeter directly measure?
change in temperature
kinetic energy
specific heat
radiation
All of the following describe climate except
it is hot today
the average temperature of a place
the average precipitation of a place
the average number of sunny days of a place
As a solid reaches its melting point intermolecular bonds have been disrupted, causing:
A: increased particle vibration
B: a change in particle position
C: breaking of intermolecular bonds
D: all of the above
Answer:
Explanation: B. A change in particle position
Answer: Option (B) is the correct answer.
Explanation:
Melting point is defined as the point at which a solid substance changes into liquid state.
During the melting point temperature of substance remains constant until the whole solid substance changes into liquid state.
At the melting point, particles of the solid vibrate rapidly and as a result position of the particles changes from one place to another.
Thus, we can conclude that as a solid reaches its melting point intermolecular bonds have been disrupted, causing a change in particle position.
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A car is traveling at a constant velocity of 60 km/h for 4 hours.
Choose the correct statement about the acceleration of the car.
A) The acceleration of this car is zero.
B) The acceleration of this car is positive.
C) The acceleration of this car is negative.
D) The acceleration of this car is 15 m/s.
Work is equal to _____.
force times size
velocity times force
distance times force
Answer : The correct option is, distance times force
Explanation :
Work : It is defined as the force acting on an object to cause a displacement. Or we can defined as the work is equal to the product of the force of an object and displacement of an object.
The formula of the work is written as,
[tex]W=F\times d[/tex]
where,
W = work done
F = force applied on an object
d = displacement of an object
Hence, the work is equal to distance times force.
Work is equal to distance times force in Physics. The force must be directly causing motion of the object for work to be calculated. For instance, pushing a box 5 meters with a force of 10 Newtons would result in 50 Joules of work.
Explanation:In the field of Physics, work is defined as the force applied on an object times the distance that the object moves. In other words, work is equal to the product of distance times force. The force must be causing the object to move in the direction of the force in order for work to happen. For example, if you push a box 5 meters with a force of 10 Newtons, the work done would be 50 Joules (10 Newtons x 5 meters).
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The amount of a light a star gives off is called___?
how does a free body diagram tell you about the net force of an object
Explanation:
A free body diagram shows all the forces acting on the object- all the magnitudes and the directions. The forces acting at an angle on an object are written in the form of their components in the horizontal and vertical direction. The forces in the single direction are added up. Thus, a free body diagram shows the net force acting on an object.
The greater the force exerted by the engine of a car over a set distance, the greater the change in ?
The greater the force exerted by the engine of a car over a set distance, the greater the change in momentum.
What is force?The definition of force in physics is: The push or pull on a massed object changes its velocity.
An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. A spring balance can be used to calculate the Force. Newton is the SI unit of force.
According to Newton's second law of motion:
Force = rate of change in momentum per unit time.
Hence, The magnitude of the change in momentum increases with the amount of force applied by a car's engine over a given distance.
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Which statement is true because of Newton's second law?
A)when the net force on an object decreases, the objects acceleration increases.
B)When the net force on an object increases,the objects acceleration decreases.
c)When the net force on an object decreases,the acceleration doesn't change.
D)When the net on an object decreases,the object's acceleration decreases.
Women in the United States have 10 hours more leisure time per week than men.
Please select the best answer from the choices provided
T F
Egenuity says the answer is False ^-^
Answer: The given statement is false.
Explanation:
In the United states, both men and women are treated equally and like men, women also work for living.
Also women has the responsibility to do house hold chores so most of the time women are busy with their family or work. Hence, they do not get enough leisure time.
Therefore, the statement women in the United States have 10 hours more leisure time per week than men, is false.
if the coolant in a refrigerator was not compressed back into a liquid after it flowed through the refrigerator what would happen
Less heat would be removed from the refrigerator.
find the velocity of an object dropped from a height of 300 m at the moment it hits the ground?
The velocity of an object dropped from a height of 300m at the moment it hits the ground is approximately 77.46 m/s.
Explanation:The subject of the question is on kinematics under gravity, also referred to as free-fall motion. Here, you are asked to find the velocity of an object just before it hits the ground, having dropped from a height of 300m.
We can use the equation of motion for this operation: v² = u² + 2gH, where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity (approx 9.8 m/s²) and H is height. In this case, the object is dropped, meaning its initial velocity (u) is zero. Substituting the values, we have v² = 0 + 2*9.8*300. Solving this, we get v = sqrt(2*9.8*300) = 77.46 m/s (approx). This is the velocity of the object at the moment it hits the ground when it is dropped from a height of 300 m.
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Electrostatic forces hold which of the following together?
Cu atoms and localized electrons in copper
K+ and Br in KBr
He atoms in helium gas
oxygen and hydrogen atoms in OH
A bird flies from the South Pole to the North Pole. Part of the journey is 1000 miles that takes 2 weeks. What is the bird’s velocity in that time? Show work for credit and include final units. help please
The correct answer to the question is : 2.976 miles/hour.
CALCULATION:
As per the question, the distance travelled by the bird X = 1000 miles.
The time taken by the bird to cover that distance t = 2 weeks.
= 2 × 7× 24 hours
= 336 hours
We are asked to calculate the speed of the bird.
The speed of the bird is calculated as -
speed v = [tex]\frac{distance}{time}[/tex]
= [tex]\frac{1000}{336}\ miles/hour[/tex]
= 2.976 miles/hour [ans]
Hence, the velocity of the bird is 2.976 miles/hour.
A student hangs a mass of 150 g on a force table at an angle of 150 degrees . If she then hangs a mass of 220 g at 270 degrees.
A) at what angle should she hang a mass of 195 g so that the ring is in equilibrium?
B) Draw the vectors
The amount of water vapor in the air is known as the
Which of the following represents the greatest speed? 40 m/s 400 cm/s 0.4 km/s 40,000 mm/s
Answer:
0.4km/s
Explanation:
To be able to know the greatest speed out of all the speed values, we will have to convert the velocities value to m/s.
Converting velocity of 400cm/s to m/s, we have;
400cm/s × 1m/100cm
= 4m/s
Since 100cm = 1m
For velocity of 0.4km/s, we have;
0.4km/s × 1000m/1km
= 400m/s
Note that 1000m = 1km
For velocity 40,000mm/s, we have;
40,000mm/s× 1m/1000mm
= 40m/s
Since 1000mm = 1m
Therefore among all the converted values, the velocity of 0.4km/s which is equivalent to 400m/s is the greatest.
A 50-cm3 block of wood is floating partially submerged in water, and a 50-cm3 block of iron is totally submerged in water. Which block has the greater buoyant force on it?
A) the wood
B) the iron
C) Both have the same buoyant force.
D) The answer cannot be determined without knowing the densities of the blocks.
Answer: Option A
Explanation: The buoyant force depends on the amount of displaced fluid (in this case water)
As the wood is less dense than the iron, the wood requires a lot less upwards force to float, and it only displaces a little bit of fluid, in the other case, the iron requires a lot more of force to do it, so it displaces a lot of water and is totally submerged, and the iron block can never float actually, so it sinks down, at the point that the buoyant force applied is negative (the weight of the water upside the block is bigger than the force upwards)
The Buoyant force can be calculated as:
B = weight on-air - weight on water.
The block of wood is floating, so the weight on the water is zero, and the buoyant force is equal to his weight in the air.
For the block of iron, we have:
B = Weight on-air - weight on water, here in both cases we have positive numbers, but not enough information to know them.
Then the only information that we have is that the woodblock displaces less water than the other block, so with this, we only can know that the buoyant force in the woodblock is smaller.
What causes an electric charge?
Question 1 options:
The movement of electrons due to a difference in electric potential energy
The movement of protons due to a difference in electric potential energy
The movement of neutrons due to a waterfall
The movement of electrons due to kinetic energy
The movement of electrons due to a difference in electric potential energy is the electric charge.
The movement of protons due to difference in the electric potential is not the definition of potential energy. The movement of the neutrons as a result of waterfall is also not the electric charge. The movement of electrons because of kinetic energy is also not the electric charge. The electric charge can be defined as the movement of the electrons from one direction to another as a result it causes a development of potential difference resulting in development of potential energy. Hence, the movement of electrons due to a difference in electric potential energy is the electric charge is the correct option.Learn more about electric charge:
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An arrow is shot vertically upward at a velocity of 50.0 m/s. what was its velocity after 2.00 seconds?
Is it possible to travel a great distance without any displacement? Prove your answer.
Answer: Yes
Explanation: The definition of displacement is the change on the position, So if i start in my home, then i go to the mall, and after that i return home, the total displacement over that period of time is 0, because i started in my house and ended in my house. But in that proces i traveled the distance between my house and the mall two times. So is possible to travel great distances without any displacement, only if the endpoint of the travel is the same as the start point.
What are gamma rays? How are they used?
Answer:
Gamma rays and its uses are discussed below.
Explanation:
Characteristics of Gamma rays
Radiation of short wavelength and high frequency.Gamma rays do not deflect in a magnetic field.Gamma rays have strong penetration energyUses of Gamma rays
Medical: Gamma rays are used as a medicine to kill the carcinogens cells and prevent them to grow again.Industrial: Gamma rays are used in the industry to check the oil pipeline and discover the weak points.
what best illustrates that light behaves like particles
Static electricity occurs because_____________ are relatively easy to scrape off atoms ...?
Static electricity occurs when electrons are transferred between atoms, often triggered by friction (triboelectric effect). This effect can be observed in real-life examples such as rubbing a balloon against hair or the operation of a Van de Graaff generator. Materials' conductivity affects the ease of electron transfer and therefore, static electricity production.
Explanation:Static electricity occurs because electrons, which carry negative charge, are relatively easy to scrape off or transfer between atoms. In everyday scenarios, static electricity is often produced by friction - a process scientifically referred to as 'triboelectric effect'. For instance, when you rub a balloon on your hair, the friction between the balloon and the hair can strip electrons off from your hair atoms. Consequently, the balloon becomes negatively charged and your hair positively charged, enabling them to attract each other due to the interaction of their opposite charges.
The behavior of static electricity can also be illustrated by the principle working behind the Van de Graaff generator. Inside it, electrons are transferred from one part to another through physical contact and motion, creating a build-up of static charge. This further causes the charges to repel each other and spread to the outer surface of the machine.
It's important to note that not every material conducts static electricity equally well. Conductors, such as metals, have free electrons that allow easy flow of electricity. Insulating materials, on the contrary, resist the flow of electricity due to the absence of free electrons.
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An air bubble at the bottom of a lake 43.5m deep has a volume of 1.00cm/cubed. If the temperature at the bottom is 5.5 degrees celcius and at the top 21.0 degrees celcius, what is the volume of the bubble just before it reaches the surface.
...?
The answer is 15.0 mL