Answer:
58.8m
Explanation:
A clock which has brass pendulum beats correctly at 30C will it run faster or slower if temperature increase or decrease
Answer:
We know that the period of a pendulum is written as:
T = 2*pi*√(L/g)
where:
g = gravitational acceleration = 9.8m/s^2
pi = 3.1415...
L = length of the pendulum, in this case, is the length of the brass pendulum.
Now, we know that the brass dilates when the temperature increases.
Then if the temperature increases, the value of L will increase, which means that the period T will also increase, because L is in the numerator of T.
If the period increases the complete motion of the pendulum needs more time, this would mean that the clock will run slower.
If the temperature decreases, the opposite occurs, the value of L decreases, and then the period also decreases, which means that the clock will run faster.
A student wants to build a simple circuit. Which material would be used to design a circuit with the last amount of resistance?
A. Long wires with a large diameter
B.Long wires with a thin diameter
C.Short wires with a large diameter
D.Short wires with a thin diameter
Answer:
C
Explanation:
The shorter a wire, the less it will be worn down from moving around, and the thicker the wire, the longer it will last.
Short wires with a wide diameter will be the material utilized to build a circuit with the minimum amount of resistance. Then, C is the right answer.
What is the circuit?Electrical devices such as resistance, transistors, capacitors, inductors, and diodes are connected via conductive wires or traces that allow the electric current to pass between them.
A closed-loop system in which electrons can move is called a circuit. Electricity is supplied to the circuit by an electricity source, such as a battery. No electrons will travel till the circuit is finished, that is, it goes full round back to the electricity source.
A student wants to build a simple circuit.
The material would be used to design a circuit with the least amount of resistance will be short wires with a large diameter. Then the correct option is C.
More about the circuit link is given below.
https://brainly.com/question/12608516
#SPJ6
You must: (a) dim your high beams for oncoming vehicles by the time they are within _____ feet of your vehicle, and (b) dim your high beams when the vehicle you are following is within _____ feet.
Answer:
500,300
Explanation:
Safety measures on the road can be regarded as activities and precautions that should be taken in order to improve safety on the road which means to reduce risk.
Whenever one is driving with high-beam lights on, one of safety precautions that must taken into consideration is that ;
You must: (a) dim your high beams for oncoming vehicles by the time they are within 500 feet of your vehicle
(b) dim your high beams when the vehicle you are following is within 300 feet.
When you dim the beam, the oncoming vehicle won't be blind, he/she would be able to see clearly. As you are approaching a car with high-beams, look at the right edge of your own lane and use Conner of your eyes to watch the oncoming car to avoid been blind .
Consider a girl that has a mass of 55.0 kg and is standing on the floor, how much supporting force does the floor have
Answer:
Explanation:
m = 55 kg
a = 9.8
F = ?
The first thing you are going to do is find the force that the girl represents.
F = 9.81 * 55
F = 539.55
But that is not the answer. That is her weight. A very important part of this question is to realize that the floor is pushing up on her with an equal force.
Her weight is going DOWN.
The floor is pushing UP with a force of 539.55 Newtons.
HELP PLEASE!!!!!!!!!!!
Explanation:
Total horizontal force50cos16.25°N + 60N - 10N =98NTotal workdone force × distance
98×100= 9800J = 9.8kJ
What is the efficiency of a machine that lifts a load of 12.0 kg a vertical distance of 5.00
m in 30.0 s after being supplied with 70.0 W of power? Explain the steps you take to get the answer.
Answer:
Efficency = 28%
Explanation:
We have the load has a weight of:
[tex]w =m*g\\w =12*9.81\\w = 117.72 [N][/tex]
Work in physics is defined as the product of force (weight) by distance.
[tex]W=w*d[/tex]
where:
W = work [J]
w = weight = 117.72[N]
d = distance = 5 [m]
[tex]W=117.72*5\\W=588.6[J][/tex]
Now power is defined as the relationship of work at a certain time.
[tex]P=W/t\\[/tex]
where:
P = power [W]
W = work = 588.6[J]
t = time = 30[s]
[tex]P=588.6/30\\P=19.62[W][/tex]
Now the efficiency of a machine is defined as the power output over the power input to the machine. The power input should always be greater than the power output.
[tex]efficency = \frac{Power_{out}}{Power_{in}}\\Efficeny = \frac{19.62}{70} \\Efficency = 0.28\\Efficency = 28%[/tex]
The momentum of an object can change. True or false?
Answer:
True
Explanation:
The momentum of the object won't change if it is left alone. However, if it is moved, the momentum will change. It depends on what you are talking about.
What is the kinetic energy of a golf ball with a mass of 0.046 kg traveling at 15.5
m/s?
Answer:
5.53 JExplanation:
The kinetic energy of an object can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex]k = \frac{1}{2} \times 0.046 \times {15.5}^{2} \\ = 0.023 \times 240.25 \\ = 5.52575[/tex]
We have the final answer as
5.53 JHope this helps you
A 0.125 kg hockey puck moving at 20.0 m/s is caught and held by an 85.0 kg goalkeeper at rest. After catching the puck, with what velocity does the goalkeeper slide across the ice?
A.
0.0351 m/s
B.
0.0294 m/s
C.
0.0320 m/s
D.
0.0263 m/s
Answer:
a
Explanation:cuz i saiad so
How would the cost of operating a 30 watt bulb relate to the cost of operating a 60 watt bulb for a given amount of time?
An object with a mass of 20 kg is accelerating at a rate of 6 m/s/s. What is the amount of force?
Answer:
120 Newtons
Explanation:
m = 20 kg
a = 6 m/s
F = ?
F = m x a
F = 20 x 6
F = 120 Newtons
cx = -105 m and cy = -88.2 m
find the magnitude and direction of the vector.
Answer:
See the answers below.
Explanation:
The magnitude can be easily found by means of the Pythagorean theorem.
[tex]C = \sqrt{(C_{x})^{2} +(C_{y})^{2}} \\C=\sqrt{(105)^{2} +(88.2)^{2} } \\C=\sqrt{18804.24}\\C = 137.13 [m][/tex]
We know that the coordinates in x and in y are negative, therefore the vector should be located in the fourth quadrant, see attached image.
And the angle with respect to the horizontal can be determined by means of the tangent of the angle.
[tex]tan(\alpha )=\frac{88.2}{105}\\tan(\alpha ) =0.84\\\alpha =tan^{-1} (0.84)\\\alpha =40[/tex]
These are 40 degrees below the X-positive horizontal axis.
Answer:
137.13
Explanation:
I got it right on Acellus
your hands get warm by a fire because _____energy is converted into heat energy
Answer:
Your hands get warm by fire because chemical energy gets converted into heat energy. When the chemical bonds in the wood are released in the air which then mixes with oxygen and emit heat. This is the reason why it is always hot when you go near something that is burning or is up in flames.
Explanation:
The density of sulfur is 2g/cm3. A large block of pure sulfur was broken into two smaller pieces. The density of each piece of sulfur is now 1 g/cm3.
True or false
Answer:
False
Explanation:
Density is an intensive property of a substance. Intensive properties are those properties that are characteristic of a substance. They do not depend on the amount of substance present.
Since density is an intensive property, each piece of sulphur still has a density of 2g/cm3.
what element is chemically similar to Krypton?
Answer:
Nobel gases
Explanation:
Well since Krypton is in a group called the “Noble Gases”, then Krypton is similar to the others; Xenon, Helium, Neon, Argon, and Radon.
1. The mass of an object on the Earth is 100. kg.
a. What is the weight of the object on the Earth?
b. What is the mass of the object on the moon?
Answer:
980N
100kg
Explanation:
Weight is Mass * Gravity.
For question a, the object with a mass of 100 kg will have a weight of
100 * 9.8 = 980N
For question b, the mass of the object will stay the same, even if it is on the moon. Therefore it is 100kg.
(a). The weight of the object on the Earth is 980 N.
(b). The mass of the object on the moon is 100 kg.
The weight of the object on the earth has been considered to be affected by the Gravitational force as it has been acting on the object.
(a) The weight of the object on Earth can be given by:
Weight = mass [tex]\times[/tex] Gravitational Force
Given, the mass of the object = 100 kg.
The gravitational force = 9.8N
Weight of the object = 100 [tex]\times[/tex] 9.8 N
Weight of the object = 980 N
(b) The mass of the object has been independent of the gravitational force that has been acting on the object.
Thus, the mass of the object on earth = the mass of object on the moon.
The mass of the object on the moon = 100 kg.
For more information about the mass of the object, refer to the link:
https://brainly.com/question/20353971
All three springs show the same relationship between the weight and extension what is relationship tick one box
Answer:
The extension is directly proportional to the force exerted by the weight on the spring.
Explanation:
When the weight is suspended to a spring , the spring is extended through a length say x cm . This displacement is directly proportional to the force exerted on the spring equal to its weight.
Mathematically
F ∝ -x
F= -kx
where x is the displacement of the spring and k is the spring's constant whose value depends on the stiffness of the spring. F is the force exerted by the weight on the spring.
If more weight is added the extension will be greater . If less weight / force is applied the extension in the spring will be less.
Given the distance between the crest of one wave and the crest of the next wave, you can determine the?
10. A toy car travels 63 m during 5.1 s at a constant speed. What is the speed of the toy car? Round your answer to the nearest thousandth, if necessary,
Speed -
Answer:
speed = 12.353 m/s
Explanation:
[tex]speed = \frac{distance}{time} [/tex]
distance = 63 m
time = 5.1 s
substitute the values into the formula
[tex]speed = \frac{63 \: m}{5.1 \: s} [/tex]
speed = 12.353 m/s
b. Velocity is both _speed __ and ___. Formula: ___
Answer: Velocity is both magnitude and direction. Formula: d(distance)/t(total time)
Explain what happens as an object moves through each phase of matter.
ASAP PLEASE ????????
Explanation:
gas vibrate and moves freely at high speeds, liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place
hope it helps you
12. Which of the following is the best example of an
organism maintaining homeostasis?
A.
a wolf panting after a chase
B.
a spider catching an insect in a web
C.
a cricket becoming infected by a virus
D.
a mole digging tunnels in the ground
Answer:
I would say A.
Explanation:
Homeostasis is pretty much a state of rest or equilibrium. Only A counts, as that wolf is trying to catch its breath and lower its breathing rate and heart rate.
(I could be wrong if B counts. Ya know, if the spider needs to stop being hungry?)
Seafloor spreading is a process that occurs along ___________1____________. At ___________2____________ boundary, two plates move away from each other resulting to spreading of seafloor, thereby creating new ___________3____________ crust. Near the mid-oceanic ridge _________4__________ rocks are found and far from it are older.
Answer:
where is the answer choices
Explanation:
i need help finding the calculation for the bed forces if diagrams.
why is gamma radiation difficult to detect
Answer:
2 reasons because there are not many of them and they have so much energy that it is hard to capture one at all
Answer:
they have a lot of energy that can prove difficult to capture
Explanation:
Explain why open pipes are preferred to closed pipe in the production of music-
Answer:
The frequencies of sounds made by these two types of instruments are different because of the different ways that air will move at a closed or open end of the pipe. Open pipes do not produce superior tone than closed (or stopped) pipes, therefore different types of pipes are used to produce different tonal qualities.
Explanation:
A truck is traveling at constant speed of t v =21 m/s is at x= (80, 100, 120, 140, 160) m in front of a police car moving with constant speed of p v =25 m/s. What is the time (in s) needs the police to catch the truck?
Answer:
t= (20, 25, ... 40) s
Explanation:
This is an exercise in kinematics specifically of uniform motion, the first thing we must do is set a reference system, we place our zero in the police car, we write the equations
police car
x₁ = v₁ t
truck
x₂ = x₀ + v₂ t
In this case, they indicate several initial positions of the truck and the speed of the two vehicles, at the meeting point the positions must be the same
x₁ = x₂
v₁ t = x₀ + v₂ t
t (v₁ - v₂) = x₀
t = [tex]\frac{x_{o} }{v_{1}- v_{2} }[/tex]
let's calculate for each initial position
x₀ = 80m
t = 80 / (25-21)
t = 80/4
t = 20 s
x₀ = 100 m
t = 100/4
t = 25 s
the last x₀ = 160 m
t = 160/4
t = 40 s
we can see that the time increases as the distance between the vehicles increases
Please help me out
please show solvings
Answer:
5) The approximate height is about 80 m. Choice (c)
6) The stone takes about 3 seconds to rise to its maximum height
Explanation:
Free Fall Motion
A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall.
If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the gravitational acceleration, which value is [tex]g = 9.8 m/s^2[/tex].
The distance traveled by a dropped object is:
[tex]\displaystyle y=\frac{gt^2}{2}[/tex]
Question 5
Given the stone reaches the ground in t=4 seconds, the height of the tower is:
[tex]\displaystyle y=\frac{9.8*4^2}{2}=78.4\ m[/tex]
The approximate height is about 80 m. Choice (c)
Question 6
Vertical Motion
The vertical motion of an object is controlled by the force of gravity. This means that there is a non-zero net force acting on the object that makes it accelerate downwards.
If the object is thrown upwards at speed vo, its speed at time t is:
[tex]v_f=v_o-g.t[/tex]
The stone reaches its maximum height when the final speed is zero, thus:
[tex]v_o-g.t=0[/tex]
Solving for t:
[tex]\displaystyle t=\frac{v_o}{g}[/tex]
The stone is thrown vertically upwards with vo=30 m/s, thus:
[tex]\displaystyle t=\frac{30}{9.8}[/tex]
[tex]t=3.06\ s[/tex]
[tex]t\approx 3\ s[/tex]
The stone takes about 3 seconds to rise to its maximum height
URGENT HELP
The electric motor in the car is powered by a battery.
To charge the battery, the car is plugged into the mains supply at 230 V
The power used to charge the battery is 6.9 kW
Calculate the current used to charge the battery.
Current = ?
Answer:
0.03 A
Explanation:
Answer:
30A
Explanation:
I (current)= p (power) / V (voltage)
I= 6.9*10^3 / 230
I= 30A
A person investing p at a certain rate of simpl interest after 1 2 and3 years it amounted to 1.5 p 2.5 p respectively what will it amount to at the end of 20 years
Answer: It will amount to 11p after 20 years.
Explanation:
Formula :
Simple interest = Principal x rate x Time (i)
Amount = Principal + Interest
Amount = Principal + Principal x rate x Time
Amount = Principal (1+ rate x Time) (ii)
Given: Principal = p
After 1 year , amount = 1.5p
After 3 years , amount = 2.5p
From (ii)
[tex]1.5p = p (1+r)\\\\\Rightarrow\ 1.5=1+r\\\\\Rightarrow\ 0.5= r\\\\\Rightarrow r= 0.5[/tex]
Amount after 20 years = p(1+ 0.5 x 20) = p(1+10)=11p
It will amount to 11p after 20 years.