Answer:
D. if it is dark, then an owl will find a mouse by the sound the mouse makes
BMW has introduced a program of covered scheduled maintenance for its cars. That is, when you bring in your vehicle for maintenance at a BMW dealership, BMW will cover the costs of everything (except for worn-out tires). This practice specifically targets which stage of the product life cycle?
Answer:
Usage
Explanation:
A product life cycle refers to the duration from the introduction of the product into the market until it's taken off the shelves.
A program of covered scheduled maintenance for the cars refers to the practice in which the dealership will cover the costs of everything when you bring in your vehicle for maintenance.
In this question, the mentioned practice specifically targets the stage - Usage of the product life cycle
who has a iphone (age range 15-19 )
Hi friend! I have an iPhone. why do you ask????
A block of wood has a mass of 8 g and occupies a volume of 10 cm3. What is its density?
Answer:
0.8 g/cm³
Explanation:
recall that the definition of density is the mass per unit volume of an object.
or mathematically:
density = mass / volume
here we are given that mass = 8 g and volume = 10 cm³
hence,
density = 8 g / 10cm³ = 0.8 g/cm³
The block has a mass of 8 g with a volume of 10 cm³. It density is mass divided by volume that is 0.8 g/cm³.
What is density?
Density of a substance is the measure of its mass per unit volume. Density is dependent on some other factors beside mass and volume such as bond type, temperature and pressure.
The ratio of density of a substance to the density of water is called its specific gravity. If the substance is denser than water it will sink on water otherwise it will float on it.
The mass of the block of wood = 8 g
volume = 10 cm³
Density = mass / volume
= 8 g/ 10 cm³
= 0.8 g/ cm³
Therefore, the density of the wood block is 0.8 g/ cm³.
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Which has more momentum? A 60 kg object traveling at 3 m/s or a 9 kg object traveling at 23 m/s.
Answer:
If we compare 270 J and 2 380.5 J the higher is 2 380.5 J which is A 9 kg object traveling at 23 m/s
Explanation:
A 60 kg object traveling at 3 m/s
Given:
m = 60 kg
v = 3 m/s
Unknown:
KE or kinetic energy
Formula and solution:
KE = 1/2 mv²
KE = 1/2 (60kg) (3m/s)²
KE = (30kg) (9m²/s²)
Final Answer:
KE = 270 kg·m²/s² or simplify as 270 J
A 9 kg object traveling at 23 m/s
Given:
m = 9kg
v = 23m/s
Unknown:
KE or kinetic energy
Formula and solution:
KE = 1/2 mv²
KE = 1/2 (9kg) (23m/s)²
KE = (4.5kg) (529m²/s²)
Final Answer:
KE = 2 380.5 kg·m²/s² or simplify as 2 380.5 J
A closed system consists of a pendulum that is swinging back and forth. If
the pendulum's kinetic energy decreases, what else must happen to the
energy of the system?
a
A. Its gravitational potential energy must decrease.
B. Its total mechanical energy must increase.
O C. Its total mechanical energy must decrease.
O D. Its gravitational potential energy must increase.
Answer:
The correct choice is D. Its gravitational potential energy must increase
Explanation:
Conservation of Mechanical Energy
The total amount of mechanical energy, in a closed system in the absence of dissipative forces like friction or air resistance, remains constant.
This means that energy cannot disappear or appear and that potential energy can become kinetic energy or vice versa.
In a closed system like a pendulum, two types of energies are considered: Gravitational potential (U) and kinetic (K). Thus, the sum of both energies must remain constant in time.
Suppose the pendulum is at a state where U=150 J, and K=350 J. The total mechanical energy is:
M = 150 J + 350 J = 500 J
If the kinetic energy decreases to a new value, say K = 200 J, then the gravitational potential must increase to compensate for this new condition, that is: U = 300 J
The correct choice is D. Its gravitational potential energy must increase
Taking into account the definition of kinetic, potencial and mechanical energy, the correct answer is option D: If the pendulum's kinetic energy decreases Its gravitational potential energy must increase.
Kinetic energyKinetic energy is a form of energy. It is defined as the energy associated with bodies that are in motion and this energy depends on the mass and speed of the body.
Kinetic energy is defined as the amount of work necessary to accelerate a body of a given mass and at rest, until it reaches a given speed. Once this point is reached, the amount of accumulated kinetic energy will remain the same unless there is a change in speed or the body returns to its state of rest by applying a force.
Potential energyOn the other hand, potential energy is the energy that measures the ability of a system to perform work based on its position. In other words, this is the energy that a body has at a certain height above the ground.
Gravitational potential energy is the energy associated with the gravitational force. This will depend on the relative height of an object to some reference point, the mass, and the force of gravity.
Mechanical energyFinally, mechanical energy is that which a body or a system obtains as a result of the speed of its movement or its specific position, and which is capable of producing mechanical work. Then:
Potential energy + kinetic energy = total mechanical energy
The principle of conservation of mechanical energy indicates that the mechanical energy of a body remains constant when all the forces acting on it are conservative (a force is conservative when the work it does on a body depends only on the initial and final points and not the path taken to get from one to the other.)
Therefore, if the potential energy decreases, the kinetic energy will increase. In the same way, if the kinetics decreases, the potential energy will increase.
This caseThis principle can be applied in this case. The mechanical energy of the pendulum remains constant when all the forces acting on it are conservative.
So, the correct answer is option D: If the pendulum's kinetic energy decreases Its gravitational potential energy must increase.
Learn more about mechanical energy:
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Answer:
workdone = force x displacement
= 27.5 x 12.3
= 338.25 J
If the total age of three brothers Jack Sam and DeMarco is 33 what are the ages of the boys if Sam is half of the age of Jack and DiMarco is two years younger than Jack
Answer:
Jack is 14, DiMarco is 12, Sam is 7
Explanation:
Please this question
Answer:
1. 7
2. Mass
3. (b) Distance
4. (b) Force
5. (a) ML⁻¹T⁻²
6. (c) M⁻¹LT²
7. (c) M⁻¹L³T⁻²
8. (c) Pressure
9. (c) Young's modulus
10. (b) zero
11. (c) Infinite
12. (d) 1:4
13. (b) 0.6 J
14. (c) 45 N
15. (a) 0.4 cc
16. (a) 176.7 °F
17. (a) 10°C
18. (c) 50 K
19. b. H
Explanation:
15. Whereby the compressibility = 4 × 10⁻⁵ Pa⁻¹
The compression ratio for 100 Pa = 4 × 10⁻⁵ × 100 = 4 × 10⁻³
The Change for 100 cc = 4 × 10⁻³ × 100 cc = 0.4cc
A force of 6.0 N is applied horizontally to a 3.0 kg crate initially at rest on a horizontal frictionless surface. After the crate is pushed for 1.5 seconds, it has a gelocity of 3.0 m/s. Does this support Newton’s second law of motion, that force equals mass times acceleration?
A 52-kg bike is moving along a smooth road at a constant velocity of 8.4 m/s. What is the net force acting on the bike
Answer:
0 N
Explanation:
Net force = mass × acceleration
∑F = ma
The velocity is constant, so the acceleration is 0. Therefore, the net force is 0.
The net force acting on the bike is 0 N.
What is net force?Net force is the sum of all forces acting on an object. The net force can be calculated using Newton's second law, which states that F = ma, where: F is the net force. m is the mass of the object. a is acceleration.
The velocity is constant, so the acceleration is 0. Therefore, the net force is 0 N.
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if it takes 3.5 hours for the Hogwarts Express, moving at a speed of 120 mi/hr, to make it from Platform 9 and 3/4 to Hogwarts, how far apart are they?
Using Newton's First Law, predict what will happen when a car traveling on an icy road approaches a sharp turn
O The car will come to a complete stop without sliding
O The car will continue to travel in a straight line
O The car will be able to turn without difficulty
O The car will accelerate forward
Answer:
i need the answer broo i am sooo koko
Explanation:
dsfedaes
Alice added sodium chloride to water and stirred the water for several minutes. Alice is most likely trying to demonstrate that ionic compounds
A. are hard
B. can dissolve
C. are clear.
D. can melt.
Answer:
Can dissolve
Explanation:
Help! Please: Which is elastic and which is inelastic
An atom of an element has 8 protons and 9 neutrons in it's nucleus. What is the name of the element?
HELP HELP HELP HELP ME PLEASE HURRY
First answer is Muscle tissue. Second answer is Nervous tissue. Third answer is Epithelial tissue. And last answer is Connective tissue.
When you cook a marshmallow on a metal poker tool over an open flame, energy is transferred. Identify the three different ways thermal energy is transferred in this situation. Be sure to name the specific places or phenomenon in this system where each of the types of thermal energy transfer is occurring and the direction the energy is being transferred (from what to what).
Answer:
The three ways thermal energy is transferred are;
1) Conduction
2) Convection
3) Radiation
Explanation:
1) The conduction of the heat from the open flame to the marshmallow is through the direct contact of the flame with the marshmallow, such that the flame the region of the combustion reaction, that produces light and heat touches the marshmallow
2) The convection process is the transfer of heat from the rising heated combustion products, as well as the heated air that rises from the flame
3) The radiation heat transfer is the transfer of the heat from the fire to the marshmallows directly by the heat the moves in the form of electromagnetic waves at temperatures above 1000 K, without the need for a medium, such that the marshmallow can be heated by the heat coming from side of the flame.
List three applications of pressure in our daily lives.
Answer:
1) Skis have a large area to reduce the pressure on the snow. This ensures that the skis do not sink into the snow too far.
2) The pressure under the studs on the soles of football shoes is high enough for them to sink into the ground, which gives extra grip.
3) A vacuum cleaner has a fan inside that creates a low pressure inside the device. Consequently, air and dirt particles are sucked into the device.
III.
Solve:
1. An elephant puts a force of 30000N on its four feet, which have a total area of
750cm. What is the pressure exerted by the elephant on the
ground?
please explain T-T
a child riding a bicycle at 15 meters per second accelerates at -3,0 meters per second? for 4.0 seconds. What is the child's speed A at the end of this 4.0-second interval? (with work, all steps))
Answer:
27m/sExplanation:
Given data
initital velocity u=15m/s
deceleration a=3m/s^2
time t= 4 seconds
final velocity v= ?
Applying the expression
v=u+at------1
substituting our data into the expression we have
v=15+3*4
v=15+12
v=27m/s
The velocity after 4 seconds is 27m/s
A physics book is moved once around the perimeter of a table of dimensions 1.0m by 2.0 m. a. if the book ends up in its initial position, what is its displacement? Type here b. What is the distance traveled?
Answer:
A. 0 m.
B. 6 m.
Explanation:
Displacement is final position to initial position in the shortest length possible, if you end at your initial position then your displacement is basically 0.
Since the book traveled along the perimeter of a table of 1m and 2m then its perimeter is a total of 6m, which is basically how far the book traveled.
Please help me out with my physics
hows a 170 g hamster sitting on an 830 g wedge-shaped block. The block, in turn, rests on a spring scale. An extra-fine lubricating oil having μs=μk=0 is sprayed on the top surface of the block, causing the hamster to slide down. Friction between the block and the scale is large enough that the block does not slip on the scale.
The complete question with the scale is missing, so i have attached it.
Answer:
930 g
Explanation:
The block surface is frictionless, therefore, the only force that can possibly be applied to the block from the hamster will be the normal force.
Now, the force of gravity on the hamster acts downward and equals mg. Hence, The normal component will be;
F_n = mgcosθ.
Now, if we Assume that the scale does not respond to horizontal force component, the downward component of the normal force will be expressed as;
F_d = F_n(cosθ)
The scale measures the downward component.
Earlier, we saw that; F_n = mgcosθ
Thus; F_d = mgcosθ × cosθ
F_d = mg(cos²θ)
Now, when the friction was high, the measurement of the scale was;
(m+ M)g
Where ;
m = mass of hamster
M = mass of block
Therefore, when the friction is removed the scale measurement is;
mgcos²θ + Mg or (mcos²θ + M)g
But this is in units of Newton's.
Thus;
Measurement in kg is;
(mcos²θ + M)
We are given;
m = 170 g = 0.17 kg
M = 830 g = 0.83 kg
From the attached scale image,
θ = 40°
Thus;
Measurement = (mcos²θ + M) = ((0.17 cos²40) + 0.83) = 0.93 kg or 930g
A racecar on a straight track, starting from rest*, steps on the
accelerates towards the finish line at 10.0 m/s^2. If the finish line is
500.0m away, how yong does it take the car to cross the finish line?"
A 5.08
B 10.05
C 20.05
D 50.0s
E 100.0
the energy transferred by a force of a moving object
Answer:
kinetic or mechanical cant remember
Explanation:
Answer:
Hey!!
Kinetic Energy is your answer!
Explanation:
I hope this helped you!
A cricket stump has a sharp point at one end use the words force area or pressure
Answer:
using the pressure of stump
Answer: Using the pressure of a stump
A person throws a ball horizontally from the top of a building that is 26.1 m above the ground level The ball lands 112 m away from the base of the building Neglect air resistance and useg = 9.81 m/s ^ 2
Answer:
v = 5.21 m/s
Explanation:
Let the initial speed be v.
The top of a building is 26.1 m above the ground level and the ball lands 112 m away from the base of the building.
We need to find the initial velocity of the ball.
Let it was at rest initially. Using the second equation of motion to find time of flight.
[tex]d=ut+\dfrac{1}{2}gt^2\\\\t=\sqrt{\dfrac{2d}{g}} \\\\t=\sqrt{\dfrac{2\times 26.1}{9.81}} \\\\t=2.3\ s[/tex]
No, using the formula of speed.
[tex]v=\dfrac{d}{t}\\\\v=\dfrac{12\ m}{2.3\ s}\\\\v=5.21\ m/s[/tex]
So, the initial velocity of the ball is 5.21 m/s.
I need help because I don’t understand that question
Which statements about energy are true?
1.Energy is found only in moving objects.
2.Energy is never created.
3.Energy can move matter.
4.Energy is the same as force.
5.Energy is never destroyed
Answer:
Energy is found only in moving objects : False
Energy is never created : True
Energy can move matter : True
Energy is the same as force : False
Energy is never destroyed : True
Explanation:
Plato
Energy can neither be created nor be destroyed. Energy is generated by both moving and stationary objects but in different forms. Energy can move matter. Hence, options 2, 3 and 5 are correct.
What is energy conservation ?According to the law of conservation of energy, energy can neither be created nor be destroyed. However, it can be transformed from one state to the other. For example electrical energy can be converted to light energy.
Energy is generated in both stationary and moving object. The energy for a particle gained by its motion is called its kinetic energy. The energy stored on an object at rest is called potential energy.
Energy can move matter as well. The energy used to displace an object is called work done on the object. The unit of energy and work done is joule. Therefore, options 2, 3 and 5 are correct.
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When a gas increase in thermal energy it will go through...?
A. thermal contraction
B. thermal expansion
C. freeze
D. smell
Answer:
b
Explanation: