Explanation:
The frequency of the engine is given by :
[tex]f=\dfrac{rpm}{60}[/tex]
We have, the engine increases its performance from zero to 2700 rpms.
Frequency,
[tex]f=\dfrac{2700}{60}\ \text{cycles per second}\\\\f=45\ \text{cycles per second}[/tex]
The time period of the engine is given by :
T = f/f
So,
[tex]T=\dfrac{1}{45}\ s\\\\T=0.023\ s[/tex]
Hence, the required frequency and the period is 45 cycles/second and 0.023 seconds respectively.
An object has an initial velocity of 15 m/s. How long must it accelerate at a constant rate of 3.0 m/s^2 before its final velocity is equal 30 m/s?
Answer: v=u + at
V= Final velocity =30m/s
U= initial velocity = 15m/s
a= acceleration = 3m/s^2
t= time taken
t=(v-u)/a
t=(30-15)/3
t=5s
Explanation:
DEFINE METRIC PREFIX.
Answer:
A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol.
Explanation:
In the metric system of measurement, designations of multiples and subdivision of any unit may be arrived at by combining with the name of the unit the prefixes deka, hecto, and kilo meaning, respectively, 10, 100, and 1000, and deci, centi, and milli, meaning, respectively, one-tenth, one-hundredth, and one-thousandth ...
I just need help with physics (in regards of kinetic energy, gravitational potential energy, work, work and mechanical objects) since I don't understand it at all. thank you to those who can/will help!
Answer:
First, the total energy of an object is E, and this is conserved if we do not interact with the object.
We can write:
E = U + K
Where U is the potential energy. For an object of mass M that is lifted a height H from the ground, the potential energy is:
U = M*g*H
where g is the gravitational acceleration. g = 9.8m/s^2
And K is the kinetic energy, written as:
K = (M/2)*v^2
where v is the velocity of the object.
a) We have an object with mass M = 80kg, lifted at a height H = 10m.
The gravitational potential energy is then:
U = 80kg*9.8m/s^2*10m = 7,804 J
And because the object is not moving, the velocity is equal to zero, then at this point the kinetic energy is equal to zero, which will mean that the total energy E is equal to the potential energy.
b) At the instant before hitting the ground the height of the object is near zero, then at this point the potential energy is almost zero, which means that all the potential energy has transformed into kinetic energy. Then the kinetic energy at this point should be:
K = 7,804 J
c) Work is defined as a force doing a motion.
W = F*d
F = force.
d = distance.
In this case, the force is the weight of the object.
Weight = 80kg*9.8m/s^2 = 784N
And the distance that the object moves is 10 meters, then the work done is:
W = 784N*10m = 7,840 J
d) The final velocity v can be obtained from the kinetic energy.
We know that K = (80kg/2)*v^2 = 7,840 J
v^2 = 7,840 J/40kg
v = √( 7,840 J/40kg) = 14m/s
What moves in and out of an open system like the human body?
Carbon dioxide because that's what we breath out?
In a ______ solar system, the planets orbit around the sun.
A. Geocentric
B. Monolithic
C. Heliocentric
D. Pericentric
what is a amplitude????????
Two bodies of mass m₁ & m₂ are moving with the same velocity 'v' K.E. will be greater for??
Answer:
the one with a higher mass
Explanation:
The body with more mass will have the greater kinetic energy of the two.
Kinetic energy is the energy due to the motion of body. It is mathematically expressed as:
K.E = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
Since the velocity of the two bodies are the same, and mass is directly proportional to kinetic energy, the body with more mass will have a higher kinetic energy.
So between mass m1 and mass m2, the one with a greater mass will have a higher kinetic energy
1. 1. A 2 kg ball starts with a velocity of 4 m/s. After a force is applied to it for 5 s, its
velocity is 12 m/s. What is the force acting on the ball?
Answer:
F = 3.2[N]
Explanation:
This problem can be solved by applying the principle of conservation of linear momentum, where the original momentum plus the momentum applied on the body, will be equal to the final momentum. This can be interpreted by means of the following equation.
[tex](m_{1}*v_{1})+(F*t)=(m_{1}*v_{2})[/tex]
where:
m₁ = mass of the ball = 2 [kg]
v₁ = initial velocity = 4 [m/s]
F = force applied [N]
t = time = 5 [s]
v₂ = final velocity = 12 [m/s]
Now replacing:
[tex](2*4)+(F*5)=(2*12)\\8+5*F=24\\5*F=24-8\\5*F=16\\\\F=3.2[N][/tex]
Help I'm struggling
Answer:
a. 10 Amps
b. 22 Ohms
c. 220 kW·h
d. $13.2
Explanation:
a. The question is with regards electric power, "P", which is given as follows;
P = I × V
Where;
P = The power generated by electric current
I = The current flowing in the circuit (through the resistance, R)
V = The voltage in the circuit
The given parameters of the electric oven are;
The resistance of the electric oven = R
The power consumed by the electric oven, P = 2200 W
The voltage at which the electric oven is working, V = 220 V
Therefore, from the equation for power, P = I × V, we have;
I = P / V
Therefore, we have;
I = 2,200 W/(220 V) = 10 Amps
b. The velocity, V = I × R
Where;
I = The current flowing
R = The resistance of the circuit
By making "R" the subject of the equation for voltage, "V", we have;
R = V/I = 220 V/(10 A) = 22 Ohms
c. The number of hours per day the resistor is used = 4 hours
The number of hours the resistor is used in 1 month (30 days) = 30 × 4 hours, t = 120 hours
The electric energy, E = P × t = 2200 W × 120 h = 220000 W·h = 220 kW·h
d. If electric energy costs, C = 0.06$/kW·h
Therefore, the cost to operate the electric oven during 1 month = 0.06$ × 220 kW·h = $13.2
How much work is required to move an electron
through a potential difference of 3.00 volts?
(1) 5.33 × 10^–20 J (3) 3.00 J
(2) 4.80 × 10^–19 J (4) 1.88 × 10^19 J
Answer:
(2) the work required to move the electron is 4.8 x 10⁻¹⁹ J.
Explanation:
Given;
potential difference, V = 3.00 volts
charge of electron, q = 1.6 x 10⁻¹⁹ C
The work required to move an electron is calculated as;
W = Vq
where;
W is the work done in Joules
Substitute the given values and solve for W;
W = (3.00)(1.6 x 10⁻¹⁹)
W = 4.8 x 10⁻¹⁹ J.
Therefore, the work required to move the electron is 4.8 x 10⁻¹⁹ J.
8
Which subatomic particle does not have a charge? *
protons
neutrons
Or electrons ?
Answer:
Answer is neutrons.
Explanation:
The nucleus contains two types of subatomic particles, protons and neutrons.the protons have a positive electrical charge and the neutrons have no electrical charge.
I hope it's helpful!
Determine the pressure P of a 450K Oxygen gas in a gas chamber when its initial pressure is 175Pa has a temp 300K
Answer:
262.5Pa
Explanation:
Given parameters:
P1 = 175Pa
T1 = 300K
T2 = 450K
Unknown:
P2 = ?
Solution:
To solve this problem, we are going to use an adaptation of the combined gas law.
[tex]\frac{P1}{T1}[/tex] = [tex]\frac{P2}{T2}[/tex]
Insert the parameters and solve;
[tex]\frac{175}{300}[/tex] = [tex]\frac{P2}{450}[/tex]
P2 = 262.5Pa
The table above lists the wavelength range, frequency range, possible uses, and hazards of the seven types of electromagnetic radiation. Which type of radiation helps doctors image the interior of the human body but also causes cell damage?
A.
microwave
B.
infrared
C.
radio wave
D.
X-ray
Which of the following is true about myelin?
It inhibits neural communication.
O It cannot be affected by illness.
It is covered by axons.
It's a fatty insulation.
It slows down neuronal operations.
Answer:
It's a fatty insulation.
Explanation:
"Myelin" is a fatty substance which insulates the axons of the nerve cells. Therefore, it covers the axons. This makes choice A correct and choice C incorrect.
This allows faster neural communication or hastens the transmission of signals between neurons. This makes choice A incorrect and choice E incorrect. It doesn't inhibit neural communication nor does it slow down neuronal operation; rather, it increases both speed.
Myelin can be affected by illness. An example of this is the disease called "Multiple Sclerosis," which targets the myelin sheath.
Wings produce a downward force .Why would this be useful to a race car?
Answer:
it increases drag
Explanation:
Which element is most likely to have an oxidation number of +1?
O A. 1
B. Ar
Ос. К
D. Be
Answer:
K
Explanation:
.........................
a closed system stores 500 joules of energy. the system is not used for accessed. how much energy will it have one month later? how do you know?
In classical physics terms, you do work on an object when you exert a force on the object causing it to move some distance. The amount of work you actually do may have little relationship to the amount of effort you apply. For example, if you push on a car stuck in a snow drift, you may exert a lot of force (and effort) but if the car does not budge, you have not done any work! In order for work to be done on an object, the object must move some distance as a result of the force you apply. There are also constraints on the force you apply. Only force exerted in the same direction as the movement of the object result in work. You may think that you do a lot of work if you carry an arm full of books from home to school. In reality you do no work at all! In carrying the stack of books, you exert an upward force to hold the books so they don't fall to the ground. There is no movement associated with this force. As you walk, the motion of the books is horizontal not vertical. Since the force applied to the books is vertical, and the motion is horizontal, you do not do any work on the books.
Work is a transfer of energy so work is done on an object when you transfer energy to that object. The amount of work done on an object depends on the amount of force exerted on the object and the amount of distance the object moves.
Work = Force x Distance
According to Newton's Second Law of Motion, the net force on an object is dependent on the mass of the object, and its acceleration during the movement.
Force = Mass x Acceleration
The common unit of force is the Newton (N). One Newton is the force required to accelerate one kilogram of mass at 1 meter per second per second.
1 N = 1kg m/s2
The amount of work done to push a 10,000 N car a distance of 10 meters would be
10,000 N x 10 m = 100,000 N m or 100,000 J
The Newton-meters are termed joules (J). The joule is named after James Prescott Joule (1818-1889) who first calculated the amount of electrical work needed to produce a unit of heat. In his experiments, Joule discovered that the same amount of heat was produced by the same amount of either electrical or mechanical work ("the mechanical equivalent of heat").
Learn more about work here.
5. How fast does a 50 gram arrow need to travel to have 40 Joules of kinetic energy?
Answer: v = 40 m/5
Explanation:
40 J = 1/2 (105) v^2
1600 = v^2
v = 40 m/5
The velocity of the arrow weighing 50 g or 0.05 Kg to have a kinetic energy of 40 joules is 40 m/s.
What is kinetic energy?Kinetic energy is the energy generated in a body by virtue of the motion of the body. It is dependent on the mass and velocity of the body by the relation written below:
Ke = 1/2 mv²
Given the mass of the arrow = 50 g = 0. 05 kg
kinetic energy = 40 J
Thus velocity of the arrow = √(2 Ke / m)
= √(2 × 40 J / 0.05 Kg)
= 40 m/s .
Therefore, the velocity of the arrow will be 40 m/s
To find more on kinetic energy, refer here:
https://brainly.com/question/26590527
#SPJ2
4. Deformation of the hood in a head-on collision-
A. increases the mass of the car and increases the force on the occupants.
B. decreases the mass of the car and decreases the force on the occupants.
C. decreases the stopping distance and increases the force on the occupants.
D. increases the stopping distance and decreases the force on the occupants.
Answer:
D
Explanation:
not sure but the answer is on quizlet . & i got a 100 so yeah
Deformation of the hood in a head-on collision- would increase the stopping distance and decreases the force on the occupants.
Therefore the correct answer is option D.
What is elastic collision?It is the type of collision in which the total momentum as well as the kinetic energy of the system is conserved.
In an elastic collision, the quantity's momentum is preserved because the momentum before and after the impact is equal.
In a head-on accident, deformation of the hood would lengthen the required stopping distance and lessen the force applied to the passengers.
The stopping distance increases which increases the time period and reduces the impact of the force.
Thus, the correct answer is option D.
Learn more about the collision from here, refer to the link;
brainly.com/question/2356330
#SPJ2
I NEED ANSWERS!
Give an example of how energy flows in a system. Come up
with an example that was not explained in the text.
Answer:
A water fall?
Explanation:
It's an example I took in my science class
"For example, when you exercise you get hot. The heat you feel in your body results from the energy transfers that happen when you move. When you sweat, your body expends energy to cool itself down. A food chain shows how energy flows from one organism to another."
Questlon 2 of 10
What does Archimedes' principle state?
OA. The pressure of a fluid decreases as the speed of the fluid
OB. The pressure exerted by a fluid decreases as depth increases.
OC. The pressure at two pistons within an enclosed fluid system is
OD. The buoyant force on an object is equal to the weight of the fluid
increases.
always the same.
displaced by the object.
SUBMIT
Answer:
the answer is OD which says tge buoyant girce on an object is equal to the weight of th fluid
To impart the greatest momentum to an object, should
you exert the largest force possible, extend that force for
as long a time as possible, or both? Explain.
HELP PLS .. The half-life of potassium-44 is 22 minutes. It decays into calcium-44. After
66 minutes, what fraction of the original amount of potassium-44 in a sample
will still be potassium?
Answer:
B. 1/8
Explanation:
did the test !!
Answer: 1/8
Explanation:
Just took the test
In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 2.50 m and cross the bar with a speed of 0.68 m/s
Answer:
7.037 m/s
Explanation:
According to the law of energy conservation;
The total of the initial K.E = The total final K.E
This expression implies that:
[tex]\dfrac{1}{2}mv^2 = mgh + \dfrac{1}{2}mu^2[/tex]
By simplifying the above expression;
[tex]v^2 = 2gh + u^2[/tex]
where;
g = 9.81 m/s²
h = 2.50 m
u = 0.68 m/s
∴
[tex]v^2 = 2(9.81 \ m/s^2 )(2.50 \ m) + (0.68 \ m/s)^2[/tex]
[tex]v^2 = 49.5124 \ m^2/s^2[/tex]
[tex]v = \sqrt{ 49.5124 \ m^2/s^2}[/tex]
v = 7.037 m/s
How could you cause a chemical change to vinegar?
Answer: Any chemical reaction is an example of a chemical change. Examples include: Combining baking soda and vinegar (which bubbles off carbon dioxide gas)Jan 13, 2020
Explanation:
how many atoms does each element have in HNo3
Answer:
1 hydrogen, 1 nitrogen and 3 oxygen atoms.
Explanation:
A student throws a 0.22 kg rock horizontally at 20.0 m/s from 10.0 m above the ground. Find the initial kinetic energy of the rock.
Answer:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that 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
Kinetic energy = [tex]\frac{1}{2}[/tex] x 0.22 x 20² = 44J
If you put something like a piece of cardboard between a magnet and an iron nail, the magnet still holds the nail in place, even though the magnet is not touching the nail.
Explain how that happens.
Answer:
Hiiii
Explanation:
Helllooooooo
How long would it take a bike to travel 20 miles at 12 mph?
Answer:
1²/3 hours or ⁵/3 hours
Explanation:
Time = Distance ÷Speed
Therefore time = 20miles ÷ 12 miles per hour
=⁵/3 hours
in science, the inquiry process involves observing, questioning, ________, and summarizing.
Answer:
proceesing
Explanation:
Answer:
predicting
Explanation:
for ap3x users
