Answer:
Explanation:
We will use the equation F - f = ma, which is a fancy way of stating Newton's 2nd Law.
F = +50.0,
f = -30.0,
m = 7.60 kg. Therefore:
50.0 - 30.0 = 7.60a and
20.0 = 7.60a and
a = 20.0/7.60 so
a = 2.63 m/s/s to the right
An elevator of 3 × 10^4N is raised to a height of 100m in 20s . The work done by electric motor is equivalent to?
Answer:
there it is fella tried on ma own observation
(01.03 MC)
What is the solution to the compound inequality 5x + 75-8 or 3x + 7 > 19?
Answer:
sorry I can help im not doing this as yet
PLS HELP IM SOO CONFUSED!
If the temperature of the conductor is increased , the electrons ' speeds decrease
true or false
Answer:
false
Explanation:
the motion creates current and heat at the same time
What are the postulates of STR?
Answer:
The laws of physics take the same form in all inertial frames of reference. As measured in any inertial frame of reference, light is always propagated in empty space with a definite velocity c that is independent of the state of motion of the emitting body.
Which describes the electromagnetic force only? Check all that apply. is attractive is repulsive has an infinite range has a very small range produces light produces electricity
Answer:Electromagnetic force, like all forces, is measured in Newtons. Electrostatic forces are described by Coulomb’s law, and both electric and magnetic forces are covered by the Lorentz force law. However, Maxwell’s four equations provide the most detailed description of electromagnetism.
Explanation:
Answer:
attractive, repulsive, produces light & electricity
Explanation:
edge 2021
Nesse texto, um argumento usado para defender a ideia de que o filme A Caminho da Lua cumpre o papel de tocar e de entreter encontra-se no trecho:
“O filme foca em Fei Fei, garota de 12 anos que enfrenta dificuldades em superar o luto pela mãe e aceitar a nova noiva de seu pai.”. (1º parágrafo)
“... a menina decide construir um foguete para viajar até o satélite...”. (1º parágrafo)
“O que faz o longa se destacar é seu cenário mergulhado na cultura chinesa e a delicadeza com que o luto e sua superação são tratados.”. (2º parágrafo)
“... o foco quase exclusivo na garota prejudica todos os outros personagens...”. (3º parágrafo).
ajudem_me
Answer:O que faz o longa se destacar é seu cenário mergulhado na cultura chinesa e a delicadeza com que o luto e sua superação são tratados.
Explanation:
Por que se você pensar ela estava sempre buscando superar a morte da mãe.
A deer walks 17.0 m south and then 12.0 m north. Find both the magnitude of its displacement and the distance traveled.
A)
5.0 m, 29.0 m
B)
5.0 m, 5.0 m
C)
29.0 m, 29.0 m
D)
29.0 m, 5.0 m
Answer:
Explanation:
Displacement involves direction and distance. In this case, the deer has walked a distance of 17 + 12 = 29m but because of the South-then-North direction, the net displacement is only 17-12 = 5m.
So the answer is A) 5.0 m, 29.0 m
Displacement:-
17-12=5mDistance:-
17+12=29mState two properties of magnetic lines of force.
The magnetic lines of force has the following properties:
Each line is a closed and continuous curve.
They originate from the north pole and terminate at the south pole.
They will never intersect each other.
They are crowded near the poles where the magnetic field is strong
7.) A neutral atom loses two electrons. Which of the following ions might result? HELP ME ASAP!!!
Answer:
A. Mg+2
Explanation:
im not sure, but since it lost two electrons which have a negative charge it gained two charge.
In an experiment, 120 g of ice at 0 °C is to be melted. The specific latent heat of
ice is 340 J/g. Assume that all the energy from the heater will be used to melt
the ice.
Q1) Calculate the expected time for which the 60 W heater is switched on.
Answer:
[tex]680\; \rm s[/tex].
Explanation:
Start by finding the total amount of energy required for melting that much ice.
[tex]\begin{aligned}&\text{Energy required for melting ice sample} \\ &= \text{Mass of Ice} \times \text{Specific Latent Heat of Ice} \\ &= 120\; \rm g \times 340\; \rm J \cdot g^{-1} = 4.08 \times 10^{4}\; \rm J \end{aligned}[/tex].
Hence, the heater would need to supply (at least) [tex]4.08 \times 10^{4}\; \rm J[/tex] of energy.
The power of the heater is [tex]60\; \rm W[/tex], which is equivalent to [tex]60\; \rm J \cdot s^{-1}[/tex], In other words, the heater is rated to supply [tex]60\; \rm J[/tex] of energy every second.
Amount of time it takes for the heater to supply [tex]4.08 \times 10^{4}\; \rm J[/tex] at [tex]60\; \rm J \cdot s^{-1}[/tex]:
[tex]\begin{aligned}\frac{4.08 \times 10^{4}\; \rm J}{60\; \rm J \cdot s^{-1}} = 680\; \rm s\end{aligned}[/tex].
Hence, it would take [tex]680\; \rm s[/tex] for the heater to melt the ice if the heater is insulated, and all the energy from the heater went to the ice.
A man of mass 60kg runs with a constant velocity. He has kinetic energy of 750 joules. calculate his velocity
Given, mass of the man, m=60kg
Kinetic energy of the man, E
k
=750J
If v is the velocity of the man, then
E
k
=
2
1
mv
2
or v=
m
2E
k
=
60
2×750
=5m/s
Answer:
[tex]{ \bf{kinetic \: energy = \frac{1}{2}m {v}^{2} }} \\ { \tt{ 750= \frac{1}{2} \times 60 \times {v}^{2} }} \\ { \tt{ {v}^{2} = 25 }} \\ \\ { \tt{v = \sqrt{25} }} \\ { \bf{velocity = 5 \: m {s}^{ - 1} }}[/tex]
A fiber-optic rod consists of a central strand of material surrounded by an outer coating. The interior portion of the rod has an index of refraction of 1.97. If all rays striking the interior walls of the rod with incident angles greater than 50.4° are subject to total internal reflection, what is the index of refraction of the coating?
Answer:
The refractive index of the outer coating is 1.52.
Explanation:
Refractive index of interior part, n' = 1.97
critical angle, C = 50.4°
Let the refractive index of the coating is n.
Use the Snell's law,
[tex]n\times sin r = n'\times sinC\\\\n\times sin 90 = 1.97 \times sin 50.4\\\\n = 1.52[/tex]
5)
A 2.0-meter length of copper wire is connected across a potential difference of 24 millivolts.
The current through the wire is 0.40 ampere. The same copper wire at the same temperature
Is then connected across a potential difference of 48 millivolts. The current through the wire
is
A)
0.20 A
B)
0.80 A
C)
1.6 A
D)
0.40 A
Answer:
The current through the wire is equal to 0.8 A.
Explanation:
Given that,
The length of a copper wire = 2 m
Potential difference = 24 mV
The current through the wire is 0.40 A.
The new potential difference is 48 mV.
We need to find the current through the wire.
As the potential difference is doubled for second wire. So the new current will be :
I' = 2I
= 2 × 0.4
= 0.80 A
So, the current through the wire is equal to 0.8 A.
Pablo kicked a ball that went 12m/s at 14° from the ground to fly through the goalie's hands. How high did the ball go?
Answer:
Explanation:
There are a couple of things we need to clear up before we start the problem. First of all, we are given an angle in the problem along with an initial velocity. BUT this is what I call a "blanket" velocity: it is neither the upwards velocity nor is it the horizontal velocity. In order to find either the upwards velocity or the horizontal velocity we have to use either the sin or the cos function, respectively. Since we are working ONLY in the y-dimension, which is up and down, we use the sin function along with the given velocity to find the upwards velocity of the ball. Secondly, we have to know that the final velocity at the max height of the ball is 0. So here is what we have:
v₀ = 12sin14 so
v₀ = 2.9 m/s
a = -9.8 m/s/s
v = 0 m/s
Δx = ??? m
The equation we need is
v² = v₀² + 2aΔx and filling in:
0 = (2.9)² + 2(-9.8)Δx and
0 = 8.4 - 2.0 × 10¹Δx and
-8.4 = -2.0 × 10¹Δx so, to the correct number of sig dig,
Δx = 170 m
1. A balloon rubbed against denim gains a charge of -8.0 uC. What is the electric
force between the balloon and the denim when the two are separated by a dis-
tance of 5 x 10-2 m?
Answer:
the ballon is purple
Explanation:
Please help! This is due in 10 minutes!! I will mark brainliest asap
a condenser of capacitor 50 micro coulomb is charged to 10 volt the energy stored is
Answer:
a condenser of capacitor 50 micro coulomb is charged to 10 volt the energy stored is 5×10−3J.
A car travelling along a straight road has kinetic energy of 180 kJ. The brakes are applied, and it is brought to rest over a distance of 60 m. What is the average force of the car breaks?
A. 3 N
B. 3000 N
C. 10,800 N
Answer:
Given,
w= 180J
s=60m
W=F×s
180=F×60
180/60=F
F= 3 N
A ball is dropped from the top of a building. It initially
moves at 40 m/s. After 0.5 seconds, it moves at 3.8
m/s.
What force is responsible for the slowing of the ball?
air resistance
gravity
normal
tension
Answer:
Explanation:
I'm assuming you missed the decimal point in the initial velocity and that it should be 4.0 m/s. If after a half of a second it is moving a tiny bit slower, it would be because of air resistance. You can only neglect air resistance if the problems you are doing tell you neglect it.
Answer:
Air resistance
Explanation:
I got it correct on the quiz :)
What are various systems of unit?
Answer:
hlw its jess bregoli
your answer is here
SI (International System of Units) (meter-kilogram-second-ampere-kelvin-mole-candela)
FPS (foot-pound-second)
MKS (meter-kilogram-second)
CGS (centimeter-gram-second)
EMU (Electromagnetic) (centimeter-gram-second-abampere)
ESU (Electrostatic) (centimeter-gram-second-abcoulomb)
Atomic (bohr-electron mass-atomic second-electron)
MTS (meter-tonne-second)
Explanation:
hope it may help you !!
Answer:
there are 4 types of systems. They are ,
SI - accepted world wide
MKS - meter kilogram second
CGS - centimeter gram second
FPS - foot pound second
hope it helps.
What type of electromagnetic waves do heat lamps give off?
A. infrared
B. ultraviolet
C. microwaves
D. radio waves
A 560 Hz tuning fork and a piano key are struck together, and four beats are heard. When a 572 Hz tuning fork and the same piano key are struck, eight beats are heard. What is the frequency of the piano key?
564 Hz
556 Hz
572 Hz
560 Hz
Answer:
556
Explanation:
What is the difference between circular and rotatory motion?
Answer:
In a circular motion, the object just moves in a circle. In rotational motion, the object rotates about an axis. ... For example, Earth rotating on its own axis.
Answer:
Its different
Explanation:
it's different because
HELPPP ILL GIVE BRAINLIST
Answer:
2. Letter C all those in the list are non living
3. Letter A a skunk is a living organism that shapes its environment
5. Letter A when talking about population it usually refers to a single type of species in that area
6. Letter B Niche (just recently heard of the word in ecology)
DEFINE UNIFORM AND NON UNIFORM VELOCITY
Explanation:
Uniform velocity is when an object goes an equal amount of space in an equal amount of time whereas non uniform velocity is when the object covers an unequal amount of distance in an equal amount of time.
If a driver makes contact with a steering wheel during a 35 mph crash, she comes to rest in about Δ=15 ms. If, during an identical crash, the driver makes contact with an air bag, she comes to rest in about Δ=110 ms. What is the ratio of the force exerted by the steering wheel to the force exerted by the air bag on the driver?
Answer:
The ratio of forces is 22 : 3.
Explanation:
Case I:
initial velocity, u = 35 mph
final velocity, v = 0
time, t = 15 ms
Case II:
initial velocity, u = 35 mph
final velocity, v = 0
time, t' = 110 ms
let the mass is m.
According to the Newton's second law, the force is given by the rate of change of momentum.
So
[tex]F =\frac{m(v-u)}{t}\\\\F'= \frac{m(v-u)}{t'}\\\\So, \frac{F}{F'} =\frac{t'}{t}\\\\\frac{F}{F'}=\frac{110}{15}=22:3[/tex]
what is the Young's modulus of a perfect rigid body
Answer:
Infinite
Explanation:
Young's modulus is infinite and bulk modulus is zero.
Answer:
Young's modulus is the ratio of tensile stress ( force of elasticity ) to tensile strain ( extension ).
Explanation:
[tex]E = \frac{stress}{strain} [/tex]
A small bar magnet is placed in the magnetic field of a larger
bar magnet, at the position marked Zin the diagram below.
Assuming the small bar magnet is free to rotate, how would it
be positioned?
X
no
N
S
O A.
N.
B.
N
s
O c.
S
O D.
S
x for a smaller magnet at the position marked zin
Hey guys Im Anushka from India... pls help me out in this question..
What is linear motion?
What is rotational motion?
Answer:
Linear motion, also called rectilinear motion, is one-dimensional motion along a straight line, and can therefore be described mathematically using only one spatial dimension.
Explanation:
Rotation around a fixed axis is a special case of rotational motion. The fixed-axis hypothesis excludes the possibility of an axis changing its orientation and cannot describe such phenomena as wobbling or precession
When is the kinetic energy of the ball zero and when is it at its highest? When is its potential energy at its lowest and at its highest? What happens to the kinetic energy and potential energy between point A and point B? (3 points)
Answer:
if there is only one planet in the universe and the ball is there it will have 0 kinetic energy if the ball is in the very center of that planet only if the planet itself is absolutely motionless. its at its highest if the planet is moving away from the ball at a slightly faster speed forever. Between point A and B both potential energy and kinetic energy are at perfect 0.
Explanation:
never will have a measurable kinetic or potential energy status unless every single object is included in the calculation.