Answer:
The force = F = -40000 N
Explanation:
Mass m = 1000 kg speed v₁ = 20 m/s speed v₂ = 0 m/s t = 0.5We know that,
Calculating the acceleration
using the formula
a = (v₂ - v₁) / t
= 0 - 20 / 0.5
= -20 / 0.5
= -40 ms⁻²
Thus, acceleration (deceleration) = a = -40 ms⁻²
Note: negative sign gives us an idea the car is slowing down after a collision with the barrier, thus acceleration and velocity are in opposite direction.
We know that
F = ma
= 1000 × -40
= -40000 N
Thus, the force = F = -40000 N
What is the mass of an object weighing 63 N on Earth? (Earth g = 9.8 m/s^2) *
0.1 kg
O 6.4 kg
73 kg
O617.4 kg
If cach herco in pulling with
Answer:
6.4 kg
Explanation:
From Newton's second law of motion,
F = ma
or, 63 = m * 9.8
or, 63÷9.8 = m
or, m = 6.4
I will ask again. PLEASE HELP ME! I'M BEGGING! PLEASE HELP! Using what you have learned about energy conversions, describe the energy transfer or transformation for each of the following items:
a. Clapping your hands
b. Turning on a light
Answer:
A) Mechanical energy is converted into sound and thermal energy when the hands make contact
B) Mechanical Energy used to flip the switch sets off the lever which converts into Electrical Energy. Once the light is turned on, the Electrical Energy is converted into thermal energy, light energy, and a little bit of sound energy.
If B vectos, is added A vectos under a what
condition does the resultont vectos have a
magnitude equal to the A+B?
Answer:
when A and B are travelling opposite directions
M A 40.0- cm-diameter circular loop is rotated in a uniform electric field until the position of maximum electric flux is found. The flux in this position is measured to be 5.20 × 10⁵N . m²/C. What is the magnitude of the electric field?
By electric flux, the electric field is 41.36 x 10⁵ N/C
We need to know about electric flux to solve this problem. Electric flux is the measure of the electric field through a given surface, although an electric field in itself cannot flow. It can be determined as
Φ = E . S = E . Scosθ
where Φ is electric flux, E is electric field, θ is angle of surface and S is surface area.
From the question above, we know that
Φ = 5.20 × 10⁵ N.m²/C
d = 0.4 m²
r = 0.2 m²
because of maximum flux, hence (cosθ = 1)
By substituting the following parameter, we get
Φ = E . Scosθ
5.20 × 10⁵ =E . π.r²
5.20 × 10⁵ =E . π.0.2²
E = 41.36 x 10⁵ N/C
Hence, the electric field is 41.36 x 10⁵ N/C
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Which of the following is the best way to express the dimensions of a laboratory bench (large desk)? *
1.04 m * 400 cm
1.04 m * 4.00 m
104 cm * 4.00 m
1040 mm * 4000 mm
To determine the large dimension, always big dimension should be preferred. Hence, option B is correct.
What is a dimension?An area, region, or space's length or width in one direction is referred to as a dimension in mathematics. It merely involves taking an object's length, width, and height into account.
Dimension can be expressed in any one of them, such as Length, Breadth, Width, Height, or Depth.
According to the question, the best possible way to express the dimension in 1.04 m* 4.00 m is because both the dimensions are in the same unit, so it will be easy to calculate the dimension and another thing is that all other dimensions in the option are very small, so it will take more time to measure from them because the desk is large.
Hence, measuring with 1.04 m * 4.00 m will be the more convenient and the best way as well.
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Computer-enhanced x-rays are called __________ scans. a. tms b. pet c. ct d. mri please select the best answer from the choices provided a b c d
Computer-enhanced x-rays are called CT scans.
A CT scan is a computer-based technology and refers to the inside image of the body generated by using X-rays and advanced scientific technology.
The image shows detailed information about various body parts including bones, organs, blood vessels, veins, fat, and muscles.
CT scans are more advanced, innovative, and detailed technology compared to standard X-ray techniques.
Experts performing CT scans are known as radiology technologists or radiographers.
It differs from CAT which is the reduced form of Computer Axial Tomography.
The major difference between CT scan and MRI is that CT scan uses X-rays while MRI uses magnetic fields.
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Which statement correctly compares radio waves and microwaves?
A. Radio waves have shorter wavelengths and lower frequencies than microwaves.
B. Radio waves have longer wavelengths and higher frequencies than microwaves.
C. Radio waves have longer wavelengths and lower frequencies than microwaves.
D. Radio waves have shorter wavelengths and higher frequencies than microwaves.
Answer:
C. Radio waves have longer wavelengths and lower frequencies than microwaves.
Explanation:
Radio waves and microwaves are both electromagnetic waves. They do not require a medium for their propagation.
These waves are produced as result of the vibration between electric and magnetic fields perpendicular to one another.
On the electromagnetic spectrum, the waves are listed from left to rightAlong the spectrum, wavelength increases as frequency decreases. Energy also decreases to the right on the spectrum. Since microwaves comes before radio waves, they have shorter wavelength and higher frequency than micro waves.if the angular diameter of an object is 15 arc seconds and it is 1.4 billion kilometers away, how big is its physical size?
the actual diameter of the object is 1.017×10⁵km
actual diameter, d = any line segment that passes through the center of the circle
angular diameter, θ = the angle that an actual diameter of an object makes.
distance, D= the actual path travel
distance of the object ,D= 1.4 billion = 1.4×10⁹km
angular diameter of an object,θ = 15arc
θ = 15 ×π/ (60×60×180) rad
[ ∵ 1 revolution = 2π = 360°×60×60]
Using the relation,
θ = d/D {angular diameter = actual diameter/ distance}
d = θD
d = 1.4×10⁹×[15×3.14/(60×60×180) ] km
= 1.017×10⁵km
This shows the actual diameter of the object is 1.017×10⁵km
It is the physical size of object.
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c) The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers. In the space below, draw
a labelled diagram of a thermocouple. [2] [Total 6]
The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers.
What is galvanometers?A galvanometer measures electric current electromechanically. Early galvanometers were not calibrated, but later models, called ammeters, were, and could measure current flow more precisely.
A galvanometer functions by deflecting a pointer in response to an electric current running through a coil in a steady magnetic field. Galvanometers can be viewed as a particular type of actuator.
The discovery that a magnetic compass needle deflects when near an electric current-carrying wire led to the invention of galvanometers, which was made by Hans Christian rsted in 1820. They were the first tools used to find and gauge minute currents. The apparatus was given the name Luigi Galvani by André-Marie Ampère after the Italian electricity researcher who, in 1791, discovered it.
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Can someone please answer this exactly correct and please no links
Answer:
jaja I don't remember it's been 6 years ago u don't remember nothing of that
Anna is drinking a glass of water in her kitchen. The water is too warm for Anna so she decides to make it colder by adding ice. Which statement describes why the ice cubes will melt?
A. Liquid water is reacting with solid water to absorb energy.
B. Water is evaporating from the surface of the water.
C. Slow-moving molecules move out of the ice.
D. Heat from the water moves into the ice.
Answer:
D: Heat from the water moves into the ice
Answer:
D
Explanation:
Because the molecules of a solid is going to separate form each other because of the hotness of the water and then that’s how the ice cubes would melt
An escalator is 17.4 m long. If a person stands on the escalator, it takes 47.6 s to ride from the bottom to the top. If a person walks up the moving escalator with a speed of 0.541 m/s relative to the escalator, how long does it take the person to get to the top?
Answer:
19.1 secs
Explanation:
The first step is to calculate the velocity
= 17.4/47.6
= 0.37 m/s
Therefore the time taken for the person to reach the top can be calculated as follows
= 17.4/(0.37+0.541)
= 17.4 / 0.911
= 19.1 secs
Hence the time taken is 19.1 secs
What is white noise?
Answer:
white noise is a random signal having equal intensity at different frequencies, giving it a constant power spectral density
Answer:
White noise refers to sounds that mask other sounds that might occur naturally in an environment. If you live in a city, for example, white noise could help block out noises associated with traffic. Specific sounds might be used to help encourage sleep regardless of environmental noises.
question below
image below vvvvvv firsts gets brainiest
Answer:
4-12x
Explanation:
Please mark brainiest
find the slope of the line that passes through the following pairs of points. (10, 8) (9, 13)
A hammer strikes a nail with a 8 N force for 0.018 seconds. Calculate the impulse of the hammer.
Answer:
0.144
Explanation:
Impulse is defined as force multiplied by time
please mark me brainliest
a string along which waves can travel is 2.70 m long and has a mass of 260.0 g. the tension in the string is 36.0 n. what must be the frequency of traveling waves of amplitude 7.70 mm for the average power to be 58.0 w?
By power transmitted by string, the frequency must be 163.31 Hz.
We need to know about power transmitted to solve this problem. The power transmitted by a wave on string can be determined by this equation
P = 1/2 . μ . ω² . A² . v
where P is the power, μ is mass per unit length of string, ω is angular speed, A is amplitude and v is wave propagation speed.
the wave propagation can be determined as
v = √(F.l/m)
where F is the string tension, l is length and m is the mass.
From the question above, we know that:
l = 2.7 m
m = 260 g = 0.26 kg
F = 36 N
A = 7.7 mm = 0.0077 m
P = 58 W
Find the mass per unit length
μ = m / l
μ = 0.26 / 2.7
μ = 0.096 kg / m
Find the wave propagation speed
v = √(F.l/m)
v = √(36. 2.7 /0.26)
v = √(373.85)
v = 19.34 m/s
Find the angular speed
P = 1/2 . μ . ω² . A² . v
58 = 1/2 . 0.096 . ω² . 0.0077² . 19.34
ω² = 1053777.29
ω = √1053777.29
ω = 1026.54 rad/s
Find the frequency
ω = 2πf
1026.54 = 2 . 3.14 . f
f = 163.31 Hz
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Suppose the acceleration of an elevator is 1/2 g upward, then what is the reading on the scale in the elevator.
a. 1/2 mg
b. 2 mg
c. 3/2 mg
d. m
Answer:
c. 3/2 mg
Explanation:
Given that the acceleration of an elevator is 1/2 g upward.
The reading on the scale of the elevator is the net external force acting on the elevator.
Let the force F acting on the elevator as shown,
By using Newton's 2nd law, [tex]F_{net}=ma[/tex]
where, [tex]F_{net}[/tex] is the net force acting on the elevator.
m is the mass of the elevator,
a is the acceleration of the elevator, as given a=1/2 g upward.
So, [tex]F_{net}=m\times \frac 1 2 g[/tex]
[tex]F-mg=m\times \frac 1 2 g \\\\F=mg+ \frac 1 2 mg \\\\F= \frac 3 2 mg.[/tex]
So, the reading on the scale in the elevator is [tex]\frac 3 2 mg[/tex].
Hence, option (c) is correct.
Help please, need awsnser ASAP!
Mars has a thin atmosphere.
1 point
How fast does a 400 kg car have to move to have a momentum of 800
kgm/s?
Answer:
2m/s
Explanation:
Given parameters:
Mass of car = 400kg
Momentum = 800kgm/s
Unknown:
Speed of the car = ?
Solution:
The momentum of a car is amount of motion it posses;
momentum = mass x velocity
Insert the parameters and solve;
800 = 400 x v
v = 2m/s
part 1 of 2
A neutron in a reactor makes an elastic
head-on collision with the nucleus of an atom
initially at rest.
Assume: The mass of the atomic nucleus is
about 11.1 the mass of the neutron.
What fraction of the neutron's kinetic en-
ergy is transferred to the atomic nucleus?
part 2 of 2
In the initial kinetic energy of the neutron
is 1.77 x 10^-13 J. find its final kinetic energy.
Answer in units of J.
Answer:
for part 1 the answer is 0.303
Explanation:
How much momentum does a stationary 5500 kg mass have?
Answer:0
Explanation:
All stationary objects have no momentum they do not have any motion to have momentum you need mass and motion
A Smart Car, which has a mass of 1000 kg, is going 20 m/s. When it hits the barrier, it stops with a time of 0.5 seconds. What is the change in momentum of the car?
Answer:
The change in momentum = -20000 kg m/s.
Explanation:
Mass m = 1000 kg
speed v₁ = 20 m/s
speed v₂ = 0 m/s
We know that,
The change in momentum
ΔP = m (Δv)
ΔP = m (v₂ - v₁)
= 1000 (0 - 20)
= 1000 (-20)
= -20000 kg m/s
Thus, the change in momentum = -20000 kg m/s.
Note: negative sign indicates that the velocity is reducing when it hits the barrier.
A block sits on a frictionless sheet of ice. When it is pushed by a force of 15 N, the block will accelerate at a rate of 6.4 m/s^2. The block is then moved to the moon, where the acceleration of gravity is 1.62m/s^2. The coefficient of kinetic friction between the block and the moon's surface is 0.35. If the block is now pushed with the same force, what will be its acceleration?
Answer:
[tex]a_{moon}=5.84m/s^{2}[/tex]
Explanation:
In order to solve this problem, we will need to draw a free body diagram of both situations (see attached picture).
So first, we need to find what the mass of the object is. We can do so by analyzing the horizontal movement of the first situation, so we get:
[tex]\sum F_{x}=ma[/tex]
F=ma
[tex]m=\frac{F}{a}[/tex]
so
[tex]m=\frac{15N}{6.4m\s^{2}}[/tex]
m=2.34kg
next, we can analyze the second situation, we will start by analizing the vertical movement so we can determine the Normal force, so we get:
[tex]\sum F_{y}=0[/tex]
[tex]N-W=0[/tex]
N=W
N=mg
[tex]N=2.34kg(1.62 m/s^{2}[/tex]
N=3.79N
so now we can analyze the horizontal movement of the block, so we get:
[tex]\sum F_{x}=ma[/tex]
[tex]F-N\mu _{k}=ma[/tex]
[tex]a=\frac{F-N\mu_{k}}{m}[/tex]
[tex]a=\frac{15N-(3.79N)(0.35)}{2.34kg}[/tex]
[tex]a=5.84 m/s^{2}[/tex]
A car moves 50km in the first 30 minutes and 50km in the second 30 minutes and continues in this way which motion is this -------------------------
Answer:
Uniform rectilinear movement (m. r. u.)
Explanation:
It is a continuous movement without acceleration, that is, it moves at a constant speed. The speed does not change over time, for this reason, there is no change in acceleration.
Vf = final velocity = 50/30 [km/s] = 1.67 [km/s]
Vo = initial velocity = 50/30 [km/s] = 1.67 [km/s]
Which circuit would have the most electrical power?
Circut C have most electrical power, the product of the voltage and current is highest for circuit C.
Electric Power:
It can be defined as the product of the voltage and current.
P = V x I
For circuit C
P = 4.6 x 0.6 = 2.76
Since, the product of the voltage and current is highest for circuit C.
Therefore, circut C have most electrical power.
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Um avião, após deslocar-se 120 km para nordeste (NE), desloca-se 160 km para sudeste (SE). Sendo um quarto de hora o tempo total dessa viagem, o módulo da velocidade vetorial média do avião, nesse tempo, foi de A) 320 km/h. B) 480 km/h. C) 540 km/h. D) 640 km/h. E) 800 km/h.
Answer:
E) 800 km/h
Explanation:
The computation of the average vector velocity module of the plane, at that time is shown below:
The displacement vector is
d^2 = d1^2 + d2^2
where,
d1 = northeast displacement
d2 = southeast displacement
Now
d^2 = (120)^2 + (160)^2
= 14400 + 2560
= 40000
= √40000
d = 200 km
Now the average velocity is
V = ΔS ÷ Δt
= 200 ÷ 1 ÷ 4
= 200 × 4
= 800 km/h
The alpha decay of radon-198
if it is summer solstice in the Northern Hemisphere, what is happening in the Southern Hemisphere
Answer:
Winter Solstice
what yall noticed about this picture please help me out
Answer:
theres a mouse lol
no
the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.
Explanation: