Answer:
I believe it is D
forgive me if I'm wrong
An obect is placed 20cm from a convex mirror of focal length 12cm. where does the image form?
Answer:
7.5 cm behind the mirror
Explanation:
Applying,
Using the real is positive convection: All real distance from the mirror are positive
1/f = 1/v+1/u................. Equation 1
Where f = focal length of the mirror, v = image distance, u = object distance
From the question,
f = -12 cm, u = 20 cm
substitute these value into equation 1
1/(-12) = (1/20)+1/v
(-1/12)-(1/20) = 1/v
1/v = (-5-3)/60
1/v = -8/60
v = -60/8
v = -7.5 cm
Hence the image is formed 7.5 cm behind the mirror.
I WILL MARK YOU THE BRAINLIEST NO LINKS AND IF YOU DONT UNDERSTAND THE QUESTION DONT ANSWER
Use the table. Is the metal you found gold? How do you know?
Answer:
Perform a simple test of the material in the pan to assess whether it is real gold. Raw gold appears brassy yellow and bright. If you think it is gold, place your hand between it and the sun to create shade over the gold. If it still appears bright in the pan, chances are that it is real gold.
Explanation:
expalin how waves energy and matter are related
HELP PLEASE 20 ;OINTS
These two magnets are held close together, as shown. What directions will they move once released?
In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and crashed. The crash caused both boxes to change speed. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the boxes changed speed.
Box 1 has more mass than Box 2.
Box 1 and Box 2 are the same mass.
Box 1 has less mass than Box 2
Answer:
The second one.
Explanation:
It caused both to change speed because they have both the same mass.
a rocket with an initial velocity of 20 m/s fires another engine that gives it an acceleration of 4 m/s2 over 10 seconds. How far did the rocket travel during this time?
Answer: 400 m
Explanation:
Vf= 20 + (4*10)
Vf= 60 [m/s]
x= (60^2 - 20^2) / (2*4)
x= 400 m
Why do fruits fall down when the branch is shaken?
Answer:
Explanation:
Fruits fall down when the branch is shaken because when force is applied to shake the branch,the branch comes in motion but the fruits tend to be at rest
due to inertia of rest which results the falling of fruits.
A car start moving from the rest.If the acceleration of the car is 2m/2 for 10 seconds what will be it final velocity
Answer:
20 m/s
Explanation:
Applying,
a = (v-u)/t.................... Equation 1
Where a = acceleration of the car, v = final velocity of the car, u = initial velocity of the car, t = time.
make v the subject of the equation
v = u+at.............. Equation 2
From the question,
Given: u = 0 m/s(start from rest), a = 2 m/s², t = 10 seconds
Substitute these values into equation 2
v = 0+(2×10)
v = 20 m/s
What is the equation for speed?
Speed= time + distance
Speed= distance/time
Speed = time/distance
Speed = distance x time
Electronic flash units for camera contain a capacitor for storing the energy used to produce the flash. In one such unit, the flash lasts for 1675s with an average light power output of 2.70 x 105 W . (a) If the conversion of electric energy to light is 95% efficient ( the rest of the energy goes to thermal energy), how much energy must be stored in the capacitor for one flash
Answer:
420J
Explanation:
Power is the time rate of change in energy. Power is the ratio of energy to time. The S.I unit of power is in watts.
Given that the flash lasts for 1/675 s, power output is 2.7 * 10⁵ W. Hence:
Power = Energy / time
Substituting:
2.7 * 10⁵ W = Energy / (1/675)
Energy = 2.7 * 10⁵ W * 1/675 = 400J
Therefore the energy emitted as light is 400J.
Since the conversion of electric energy to light is 95% efficient, hence the energy stored as electrical energy is:
Energy(capacitor) = 5% of 400J + 400J = 0.05*400 + 400
Energy(capacitor) = 420J
Please help with this question
Answer:
the type of force is Unbalanced force;
As upward force is not equal to downward force.
What is the speed of an aardvark that runs 10 meters every hour?
Answer:
10m/hr
Explanation:
10m/3600 sec= 1m/360sec
What is a short circuit?
Answer:
A short circuit is an abnormal connection between two nodes of an electric circuit intended to be at different voltages. This results in an electric current limited only by the Thévenin equivalent resistance of the rest of the network which can cause circuit damage, overheating, fire or explosion.
hope it helps.Please give me brainliest O:-)
Answer:
A short circuit is an electrical circuit that allows a current to travel along an unintended path with no or very low electrical impedance.
Answer this Science question NO LINKS !!!!
Hey help me and thanks in advance if you do
P = W / t
2000 = 30000 / t
t = 30000/2000
t = 30/2
t = 15 seconds
Explanation:
work(w)=30000J
power(p)=2000W
time taken(t)=?
now,
p=w/tt=w/pt=30000/2000t=15 sechope it helps.
stay safe healthy and happy.I'm walking 1.6m/s to 7-11 and it started to rain so I sped up to 2.7m/s in 1.2
seconds. What is my acceleration?
a=(vf-viyt
-0.92m/s2
O 01.1m/s2
0.92m/s2
1.1m/s2
1 points
Save A
Answer:
Explanation:
[tex]a = \frac{v_f-v_0}{t}[/tex] which is the final velocity minus the initial velocity in the numerator, and the change in time in the denominator. For us:
[tex]a=\frac{2.7-1.6}{1.2}[/tex] so
a = .92 m/s/s (NOT negative because you're speeding up)
What is the magnification when an object is placed at 2f from the pole of the convex mirror?
-2/ 3
-3/2
-1
-1/3
Answer:
Linear magnification = 1/3
Explanation:
Given:
Convex mirror
Object's distance from pole = 2f
Find:
Linear magnification
Computation:
Object distance, u = −2f
So,
1/v + 1/u = 1/f
1/v + 1/(-2f) = 1/f
1/v = 1/f + 1/2f
BY taking LCM
1/v = 3 / 2f
v = 2f / 3
Magnification, M = -v / u
So,
Magnification, M = (2f / 3) / 2f
Magnification, M = 2f / 6f
Magnification, M = 2 / 6
Linear magnification = 1/3
A tire has a tread pattern with a crevice every 2.20 cm. Each crevice makes a single vibration as the tire moves. What is the frequency of these vibrations if the car moves at 38.0 m/s
Answer:
17.27 Hz
Explanation:
Applying
v = λf................ Equation 1
Where v = speed of the car, λ = Distance between successive crevice, f = number of crevice moved in 1 seconds(Frequency of the vibration)
make f the subject of the equation
f = v/λ............. Equation 2
From the question,
Given: v = 38 m/s, λ = 2.2 m
Substitute these values into equation 2
f = 38/2.2
f = 17.27 Hz
Which of the following represent units of capacitance? You may choose more than one correct answer:
Ampere
coulomb/volt
coulomb/second
Farad
volt/coulomb
Answer:
Capacitance is a derived physical quantity measured in farad
Answer:
"Farad" is another term for the coulomb/volt measurement of capacitance, so both of those options are the correct answer. Amperes and coulomb/second are measurements of electric flow, in other words, how strong a current is.
A ball is dropped from rest out of a high window in a tall building for 5 seconds. Assuming the we ignore air resistance and assume upwards to be positive. A) What will be the final velocity of the ball B) What is the height of the building if it hits the ground after those 5 seconds. *
Answer:
I am not sure if this is the answer
(B) what is the height of the building if it hits the ground after those 5 seconds.
What Are You Doing With Your Life?
Answer:
Living it:) thats all
After being struck by a bowling ball, a 1.8 kg bowling pin sliding to the right at 5.0 m/s collides head-on with another 1.8 kg bowling pin initially at rest. Find the final velocity of the second pin in the following situations: a) The first pin moves to the right after the collision at 0.8 m/s. Answer in units of m/s. 010 (part 2 of 2) 10.0 points b) The first pin stops moving when it hits the second pin. Answer in units of m/s
Answer:
a) v₂ = 4.2 m/s
b) v₂ = 5 m/s
Explanation:
a)
We will use the law of conservation of momentum here:
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
where,
m₁ = m₂ = mass of bowling pin = 1.8 kg
u₁ = speed of first pin before collsion = 5 m/s
u₂ = speed of second pin before collsion = 0 m/s
v₁ = speed of first pin after collsion = 0.8 m/s
v₂ = speed of second after before collsion = ?
Therefore,
[tex](1.8\ kg)(5\ m/s)+(1.8\ kg)(0\ m/s)=(1.8\ kg)(0.8\ m/s)+(1.8\ kg)(v_2)\\v_2 = 5\ m/s - 0.8\ m/s[/tex]
v₂ = 4.2 m/s
b)
We will use the law of conservation of momentum here:
[tex]m_1u_1+m_2u_2=m_1v_1+m_2v_2[/tex]
where,
m₁ = m₂ = mass of bowling pin = 1.8 kg
u₁ = speed of first pin before collsion = 5 m/s
u₂ = speed of second pin before collsion = 0 m/s
v₁ = speed of first pin after collsion = 0 m/s
v₂ = speed of second after before collsion = ?
Therefore,
[tex](1.8\ kg)(5\ m/s)+(1.8\ kg)(0\ m/s)=(1.8\ kg)(0\ m/s)+(1.8\ kg)(v_2)[/tex]
v₂ = 5 m/s
A TV has a power of 65 watts and an efficiency of 70 percent. How much
power is wasted as heat?
A. 19.5 W
B. 2.2 W
C. 0.9 W
D. 45.5 W
Power of TV = 65Watt
If Efficiency = 70%, then the percentage of energy wasted is 30%
So, the amount of energy getting wasted:
= 30/100 × 65
= 1950/100
= 195/10
= 19.5 W
True or false
scientific research has now proven that atoms are composed of parts that are larger than protons neutrons and electrons
Answer:
False
Explanation:
parts that are smaller than protons neutrons and electrons
What is fundamental unit?
Answer:
The fundamental units are the base units defined by International System of Units. These units are not derived from any other unit, therefore they are called fundamental units. The seven base units are: Meter (m) for Length. Second (s) for Time.
Explanation:
How much energy is transferred in 10 seconds with a current of 13 amperes and a potential difference of 230 volts?
29900 J
Explanation:
Recall that
P = VI
= (230 volts)(13 A)
= 2990 watts
Also,
E = Pt
= (2990 watts)(10 s)
= 29900 J
Which factor contributes the most to the process of water erosion?
A) evaporation
B) gravity
C) pressure
D) temperature
HELP
Answer:
Evaporation
Explanation:
Erosion is a natural process, but human activity can make it happen more quickly. Human activity altering the vegetation of an area is perhaps the biggest human factor contributing to erosion. Trees and plants hold soil in place.
Factor that contributes the most to the process of water erosion is Evaporation. The correct option is A.
What is evaporation?Evaporation is the phenomenon of converting the liquid into gas phase by the addition of heat energy.
Erosion is also a natural phenomenon. Trees and plants hold soil in place and prevents the soil erosion. Just like that, the water erosion happens when more than natural evaporation happens due to increased heat by various factors.
Thus, Evaporation contributes the most to the process of water erosion. The correct option is A.
A bus travels to and from a school that is located 10 km to the west. What is the distance? What is the displacement?
20 km
Hope this helps Have a good day
A parallel plate capacitor has a capacitance of 6.78 μF and it is connected to a 12V battery. What is the charge on the capacitor?
Answer:
8.136×10⁻⁵ J
Explanation:
Applying,
Q = Cv................ Equation 1
Where Q = Charge on the capacitor, v = voltage of the battery, C = capacitance of the capacitor.
From the question,
Given: C = 6.78μF = 6.78×10⁻⁶ F, v = 12 V
Substitute these values into equation 1
Q = (6.78×10⁻⁶ )(12)
Q = 8.136×10⁻⁵ J
Hence the charge on the capacitor is 8.136×10⁻⁵ J