Answer:
a = 7.4 m / s²
Explanation:
The centripetal acceleration of an object that has constant speed is
a = v² / r
linear and angular velocity are related
v = w r
let's substitute
a = w² r
the angular velocity is related to the period
w = 2π / T
we substitute
a = [tex]\frac{4\pi ^2 \ r}{T^2}[/tex]
let's calculate
a = 4π² 3.00 /4²
a = 7.4 m / s²
What do u mean by 1 energy work?
Answer:
In physics we say that work is done on an object when you transfer energy to that object. If one object transfers (gives) energy to a second object, then the first object does work on the second object. Work is the application of a force over a distance. ... Energy can be defined as the capacity for doing work.
Sergio wants to begin a sensible weight loss program. Along with healthy nutrition which fitness product would benefit him the most in this weight loss goal?
Answer:
b. Comfortable pair of athletic shoes.
Explanation:
Analyzing the information and the options, the fitness product that would most assist Sergio in reaching his weight loss goals would be the pair of comfortable sports shoes, which he could use to do running exercises.
For beginning practitioners it is ideal to start exercising with short 30-minute walks until the body adapts and you gain physical conditioning and endurance.
Running has the advantage of being an excellent exercise that can be practiced anywhere, and helps in the production of dopamine, which produces a feeling of well-being and also helps in reducing hunger, in addition to working and strengthening various muscle groups in the body, activate blood circulation, decrease anxiety, improve cholesterol levels, control blood pressure, etc.
Answer:
b. Comfortable pair of athletic shoes.
Explanation:
HELP PLEASE
Which of the following is one way to decrease momentum?
A. increase impulse
B. increase force
C. increase velocity
D. increase friction
Answer:
Increase friction
Explanation:
The others would make the object move faster
What happens when condensation causes clouds to become very heavy?
a
evaporation
b
condensation
c
precipitation
d
accumulation
Answer:
C. precipitation
Explanation:
if clouds store too much water from evaporation, it will rain which is precipitation
what is one weird thing that happens at absolute zero?
Answer:
Atoms cannot move.
Explanation:
what kind of energy is called mechanical energy?
Answer:
can be called kinetic or potential energy
Explanation:
The direct transfer of heat from one substance to another substance that is touching or in direct contact is referred to as...
Answer:
Heat refers to the energy transferred from a hotter object to a cooler one. Heat is transferred in three ways: radiation, conduction, and convection. ... The direct transfer of heat from one substance to another substance that it is touching is called conduction.
Explanation:
CAN SOMEONE HELP ME PLEASE
How fast does a 500 Hz wave travel if its wavelength is 0.5 m?
Answer:
250 m/s
Explanation:
Answer:
250m/s
Explanation:
Frequency = velocity/wavelength
Then rearrange,
Velocity = frequency x wavelength
Velocity = 500 x 9.5 = 250m/s
Importance of liquid pressure
Answer:
hope it helps...
Explanation:
Both the water in the ocean and the air in the atmosphere exert pressure because of their moving particles. ... This causes greater pressure. Denser fluids such as water exert more pressure than less dense fluids such as air. The particles of denser fluids are closer together, so there are more collisions in a given area.
Date:
A body has a mass m and velocity v , if the mass is increased to 4 times and velocity is decreased to 2 times calculate the ratio of kinetic energy
Explanation:
Mass = m
Velocity = v
If Mass is increased 4 times = 4m
New velocity = 2v
Kinetic Energy
[tex] \frac{1}{2}m {v}^{2} [/tex]
So it will be 1/2 × 4m × 2v × 2v
[tex]8m {v}^{2} [/tex]
so Kinetic Energy will increase 4 times
why is solid carbon dioxide known as dry ice
Hey there..
It gets this name because it does not melt into a liquid when heated; instead, it changes directly into a gas (a process known as sublimation).
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help me, please with this queastion
Answer:
Kinetic energy is the energy due to motion. Potential energy is energy stored in matter. The joule (J) is the SI unit of energy and equals (kg×m2s2) ( kg × m 2 s 2 ) .
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What term is used when heat is transferred from one piece of matter to another until they are of equal temperature? A. combustion B. phase change C. equilibrium
The term used when heat is transferred from one piece of matter to another until they are of equal temperature is equilibrium so, option C is correct.
What is heat?Heat is energy that is transmitted from one body to another when temperatures are different. When two bodies of different temperatures are brought together, energy is exchanged, or heat flows, from the hotter body to the colder.
An increase in the temperature of the colder body and a reduction in the temperature of the hotter body is typical, though not always, the results of this energy transfer.
The system (or collection of systems) is said to be in thermal equilibrium when these temperatures equalize and heat no longer flows through them. The absence of substance flowing into or out of the system is another implication of thermal equilibrium.
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Hen Mount St. Helen's erupted in 1980, it sent volcanic ash 18 kilometers into Earth's atmosphere. Which portions of Earth's atmosphere were contaminated by the volcanic ash?
Answer:
Astronomical location of Mount St. Helen's is 46°12′01″N 122°11′22″O, meaning that such statovolcano is located at middle latitudes. In middle latitudes, troposphere is 17 kilometers high, which is below stratosphere, whose height is 10 kilometers at middle latitudes. Hence, the eruption of Mount St. Helen's in 1980 contiminated troposphere and lower parts of stratosphere due to volcanic ash.
Explanation:
Astronomical location of Mount St. Helen's is 46°12′01″N 122°11′22″O, meaning that such statovolcano is located at middle latitudes. In middle latitudes, troposphere is 17 kilometers high, which is below stratosphere, whose height is 10 kilometers at middle latitudes. Hence, the eruption of Mount St. Helen's in 1980 contiminated troposphere and lower parts of stratosphere due to volcanic ash.
Which change occurs when an atom undergoes alpha decay?
The nucleus loses mass and a new element is produced.
The nucleus gains a proton and a new element is produced.
The nucleus loses energy and remains the same element.
The nucleus loses a neutron and remains the same element.
The change that should arise at the time when an atom undergoes alpha decay is that nucleus loses mass and a new element is produced.
What is alpha decay?It is the type of radioactive decay where the atomic nucleus should be emitted an alpha particle and due to which it transforms and it should be distinct atomic nucleus.
Therefore we can say that The change that should arise at the time when an atom undergoes alpha decay is that nucleus loses mass and a new element is produced.
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Scientists observe an approaching asteroid that is on a collision course with
Earth. They devise a plan to launch a rocket that will collide with the asteroid
inelastically and stop it. The mass of the asteroid is 11,000 kg, and it is
approaching Earth at 50 m/s. If the rocket has a mass of 1700 kg,
approximately what velocity must it have to completely stop the asteroid after
collision?
A. -516 m/s
B. 105 m/s
O C. -324 m/s
D. 212 m/s
Answer:
The approximate velocity the rocket must have to stop the asteroid completely after the collision is;
C. -324 m/s
Explanation:
The parameters of the asteroid and the rocket are;
The mass of the asteroid, m₁ = 11,000 kg
The initial velocity with which the asteroid is approaching Earth, v₁ = 50 m/s
The mass of the rocket, m₂ = 1700 kg
The initial velocity of the rocket = v₂
The final velocity of the combined asteroid and rocket after the collision, v₃ = 0 m/s
By the law of conservation of linear momentum, we have;
The total initial momentum = The total final momentum
m₁·v₁ + m₂·v₂ = (m₁ + m₂)·v₃
Substituting the known values, we get;
11,000 kg × 50 m/s + 1,700 kg × v₂ = (11,000 kg + 1,700 kg) × 0 m/s
11,000 kg × 50 m/s + 1,700 kg × v₂ = 0
∴ 1,700 kg × v₂ = -11,000 kg × 50 m/s
v₂ = (-11,000 kg × 50 m/s)/(1,700 kg) = -323.529412 m/s ≈ -324 m/s
The approximate initial velocity the jet must have to completely stop the asteroid after the collision is -324 m/s.
A2.0kg arrow is fired at 10m/s into a stationary 10 kg block of ice as shown below: the arrow sticks into the block of ice and they start moving . What is the velocity of the arrow/ice combination after the collison
Answer:
the velocity is 1.67 m/s
Explanation:
The computation of the velocity of the arrow/ice combination after the collison is shown below:
Here the law of conservation is applied
[tex]p_i = p_f\\\\m_av_a+m_b+v_b= (m_a + m_b)v[/tex]
Here
[tex]m_a = 2.0 kg\\\\v_a = 10m/s\\\\m_b = 10 kg\\\\v_b = 0[/tex]
Now
[tex]v = \frac{m_av_a+ m_bv_b}{m_a + m_b} \\\\= \frac{(2.0kg) (10 m/s) + 0}{2.0kg + 10.0kg}[/tex]
= 1.67 m/s
hence, the velocity is 1.67 m/s
A roller coaster car picks up speed as it rolls down the slope. As it starts down the slope, its speed is 4m/s. It accelerates at a rate of 6 m/s/s. What is its velocity after 3 seconds?
Answer:
6 m/s^2
Explanation:
Science Why did trilobites go extinct and why are index fossil so important
Explanation:
Because they evolved rapidly, and moulted like other arthropods,trilobites serve as excellent index fossils, enabling geologists to date the age of the rock in which they are found
Ka Lon pushed a 18 kg ball off of a bridge. The ball's velocity just before
it hit the water below was 23 meters per second. Find the ball's kinetic
energy.
4761 Joules
414 Joules
207 Joules
9522 Joules
Answer:
4761J
Explanation:
Given parameters:
Mass of the ball = 18kg
Velocity before it hits the water below = 23m/s
Unknown:
Kinetic energy of the ball = ?
Solution:
Kinetic energy is the energy due to the motion of a body. It is mathematically expressed as:
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
So;
Kinetic energy = [tex]\frac{1}{2}[/tex] x 18 x 23² = 4761J
According to Archimedes' Principle, what condition has to be met for an object to float?you will get branliest
Explanation:
The buoyant force must be greater to float, otherwise it would sink, its like a barrel in water, the more water weight in it the more it sinks, the more air weight the more it rises.
When an object is dropped what happens to potential and kinetic energy as it falls
Answer:
potential energy decreases
kinetic energy increases
3. An earthquake occurs at 12:02 p.m. A seismic station records the first S-wave at 12:19 p.m. Which set
of data shows the approximate arrival time of the first P-wave and the distance to epicenter
Answer:
what y'all teachers be on
please help!!
A single constant force is exerted on an object. The graph describes the objects energy. How much work was done to increase the speed of the object from 1.0 m/s to 3.0 m/s?
A: 1.5 J
B: 2.0 J
C: 4.0 J
D: 4.5 J
Answer:
C. 4.0 J
Explanation:
Work is equal to the change in kinetic energy or kinetic energy final - kinetic energy initial. 1/2 mv^2 is the equation for kinetic energy. SInce the mass is the same, you don't have to include it when solving. 1/2 times 1^2 = 1/2. 1/2 times 3^2 = 4.5. 4.5 - 0.5 = 4 J
Usually, large amount of curent flows in a
Circuit due to two reasons ———— and ————.
Answer:
Explanation:
Possible causes for overcurrent include short circuits, excessive load, incorrect design, an arc fault, or a ground fault. Fuses, circuit breakers, and current limiters are commonly used overcurrent protection (OCP) mechanisms to control the risks
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teacher drops a book to wake up his class, and the book hits the ground after 0.5 seconds. How high was the book?
1. What is the kinetic Energy of a 1500kg object moving at 21 m/s?
2. A cat decides to jump down from the top of a bookshelf. It has 68 J of mechanical energy and 19 J of gravitational potential energy. What is the kinetic energy of the cat?
3. What is the kinetic energy of a 423 kg object moving at 14 m/s?
please i needed for grade
Which of the following refers to an attractive force between two objects due
to their mass?
A. Gravity
B. Friction
C. Free fall
D. Magnetism
what is simple machine
Answer:
ϟ [tex] \huge{ \boxed{ \purple{ \text{Simple \: Machine}}}}[/tex]
⤥ We use different types of devices in our life to make our work easier. A spade is used to dig , a broom is used to sweep , a hammer is used to pass a nail on the wall and a plank is used to drag a load up to a certain height. All these simple things or devices , which are used in our daily life are called simple machines. Such simple machines do not do our work themselves but we have to use force on them to work with them. Thus , Simple machines are those tools or devices which make our work easier and convenient to do in the direction of force.
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▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁
Explanation:
a simple machine is a device having simple structure which makes our work is a faster and more convenient.
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