Answer:
30
Explanation:
well I got it right but I'm not sure if it's the same thing
please help me with this
Answer:
Explanation:
Use the one-dimensional equation for displacement:
Δx = v₀t + [tex]\frac{1}{2}at^2[/tex] where Δx is the displacement, v₀ is the initial velocity (which is 0 since someone had to be holding the penny still before it was dropped), t is the time it takes to travel a certain distance (which is given as 4 seconds), and a is the acceleration due to gravity which is -9.8 m/s/s. Filling in:
Δx = [tex](0\frac{m}{s})(4s)+\frac{1}{2}(-9.8\frac{m}{s^2})(4s)^2[/tex] I'm going to expand this first so you can see how the units work out. First of all, anything times 0 is 0, so what is right in front of the plus sign goes to 0 and I'm going to leave it out. How this looks expanded without doing any of the actual math yet is:
Δx = [tex]\frac{1}{2}(-9.8\frac{m}{s^2})(4^2s^2)[/tex] which makes it apparent that the seconds-squared cancel each other out, leaving us with the meters only. NOW doing the math and rounding to 2 sigfig's even though there's only 1 in the number 4:
Δx = 78 m(the negative would only be used if the question we were answering was how far the penny had to fall, which would then use the negative sign to indicate that the penny is falling to a point that is below th point from which it was released. Since height is a distance measurement, it will never be negative. Keep in mind, asking how far the penny fell is not the same thing in physics as asking how tall the building was that the penny fell from.)
the natural radioactivity is done by(controlling the nuclear energy-no ability to control the nuclear energy-both of them)
Answer:
Nuclear power plants are fueled by uranium, which emits radioactive substances. Most of these substances are trapped in uranium fuel pellets or in sealed metal fuel rods. However, small amounts of these radioactive substances (mostly gases) become mixed with the water that is used to cool the reactor.
Which of these waves CANNOT travel through the vacuum of space?
A) microwaves
B) radio waves
C) light waves
D) sound waves
You push down on a 3 N box for 5 minutes. How much work was done?
Answer:
none. 0. for work to be done the object has to have displacement, and even though you were exerting force, the box did not move and s work is o it could also be 50 but I'm sure it is 0
Explanation:
Which statement describes the image?
This is an image of an elliptical galaxy.
This is an image of an irregular galaxy.
This is an image of a normal spiral galaxy.
This is an image of a barred spiral galaxy.
Answer:
Its a barred spiral galaxy
Explanation:
Answer:
It is d
Explanation:
3. A crane can lift a 5000 N object to height of 30 m in 120 seconds. The power at which the crane is
operating is:
a 125 Watts
b. 1250 Watts
c. 7500 Watts
d. 250,000 Watts
Which of the following quantities is inversely proportional to the gravitational pull between two objects?
(A) The sum of their masses
(B)The sum of their volumes
(C) The square of the distance that separates them
(D) The distance from their center to their surface
Answer:
C
Explanation:
Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces
I hope this helps a little bit
The correct Option is :
=》(C) The square of the distance that separates them
[tex]f \: \: \dfrac{1}{ \alpha } \: \: r {}^{2} [/tex]where,
f = gravitational force
r = distance between the objects
If you're the white mouse, what will you do in order for you to survive
Answer:
If I was the white mouse, I would either find somewhere to hide that matches my fur color to camoflouge with or dig into the dirt so less visible.
To find white colour habitat.
What will I do for my survival?If I was the white mouse, I would find white colour place for living because in that white colour the predators can't see me and i will be safe from them so we can conclude that finding white colour habitat is the best choice to safe myself.
Learn more about survive here: https://brainly.com/question/24323334
help meeeeeeeeeeee
what is the rheostat and what its ruleeee??
Answer:
Rheostat:=> Rheostat is an electric device used as a variable resistance, like the regulator of the fan. It is used to change the electric resistance in the electric circuit.
Principle / Rule:=> Rheostat works on the principle of Ohm’s law. Ohm’s law states that current in a circuit is inversely proportional to the resistance at the given temperature.
[tex] \infty \infty \infty [/tex]
A string is being driven by a motor with a frequency of 10 Hz. If the speed of the waves travelling down the string is equal to 24 m/s, what is the wavelength?
Answer:
λ = 2.4 m
Explanation:
The speed of a wave is defined as the product of the frequency and the wavelength of that wave:
[tex]v = f\lambda[/tex]
where,
v = speed of wave = 24 m/s
f = frequency of wave = 10 Hz
λ = wavelength of the wave = ?
Therefore,
[tex]24\ m/s = (10\ Hz)\lambda\\\\\lambda = \frac{24\ m/s}{10\ Hz}[/tex]
λ = 2.4 m
a body falls freely from rest.calculate it's acceleration
Answer:
10 m/s²
Explanation:
Since the body is falling freely from the rest, it will be having an acceleration equal to the acceleration due to gravity.
∴ Acceleration = g = 9.8 m/s². ≈ 10 m/s².
Answer:
10 m/s^2 I hope it helps u a lot
A pulse with a height of +0.5 meter encounters a second pulse with a height of +2.3 meters. A. The two pulses interfere: B. The resulting height of the medium when the pulses interfere will be: ____m
CAN SOMEONE IN THE COMMETS ON EDG HELP ME WITH THIS IM NOT DOING THIS 4 POINTS I ACTULLY NEED HELP AND STRUGGLING U GUYS CAN CAN PUT A 1.0 STAR I REALLY DONT CARE BUT CAN SOMEONE HELP PLZ
If a body is thrown up with an initial velocity 'u' and covers a maximum height of 'h' , then 'h' is equal to u²/2g
Explain in detail.
Answer:
1/2 m u^2 initial Kinetic Energy of body
m g h Potential Energy body attains as it rises to height
1/2 m u^2 = m g h conversion of KE to PE
h = u^2 / ( 2 g)
describe two effects of weathering on a cliff
Answer:
In coastal areas, strong winds and powerful waves break off soft or grainy rocks from hardier rocks. Too much weathering occurs, it might break off parts of the cliff and be dangerous to humans, or animals.
Rain has acid in it which could eat up the cliff.
Explanation:
Una masa de 4kg esta abajo la acción de una fuerza resultante de (a)4 N (b) 8N y (c) 12 N ¿Cuáles son las aceleraciones resultantes?
Explanation:
A 4kg mass is under the action of a resultant force of (a) 4 N (b) 8N and (c) 12 N What are the resulting accelerations?
Given that,
Mass, m = 4 kg
(a) Force = 4 N
We know that,
Force, F = ma
Where
a is accelertaion,
a= F/m
a = 4/4 = 1 m/s²
(b) F = 8 N
a= F/m
a = 8/4 = 2 m/s²
(c) F = 12 N
a = 12/4 = 3 m/s²
Hence, this is the required solution.
why will a plant die if it doesn't receive sunlight?
Answer:
Sunlight allows plants to perform photosynthesis, a process which is required for plant growth and health. ... Plants that are denied sufficient light will eventually lose their color and die. Plants deprived of light will grow upward, stretching their stems more rapidly that usual, searching for light.
Answer:
Sunlight allows plants to perform photosynthesis, a process which is required for plant growth and health. ... Plants that are denied sufficient light will eventually lose their color and die. Plants deprived of light will grow upward, stretching their stems more rapidly that usual, searching for light
Explanation:
i got this from
https://sciencing.com/what-happens-to-plants-if-they-have-no-sun-12486997.html#:~:text=Sunlight%20allows%20plants%20to%20perform,for%20plant%20growth%20and%20health.&text=Plants%20that%20are%20denied%20sufficient,that%20usual%2C%20searching%20for%20light.
A single output device has failed while the remainder of the PLC system is functioning normally The indicator light on the output module indicates that a signal is sent to the output point where the device is connected. You would now:
a) trace the circuit back through the logic to locate the inputs.
b) use a programming terminal to call up the rung that controls the output to see if the output coil is on.
c) check the point where the output device's field wiring is connected to the output rack.
d) check the input modules for short-circuit conditions.
Answer:
check the point where the output device's field wiring is connected to the output rack. ( C )
Explanation:
Given that an indicator light on the output module is indicating that a signal has been sent to the output point where the failed single output device is connected , the best line of action to properly indicate the output device that has filed in the PLC system, is to check the point where the output device's field wiring is connected to the output rack in the PLC system.
A PLC system is a computer control system ( especially Industrial ) that helps in the monitoring the states of input and output devices in an industry.
two difference between hydraulic brake and hydraulic lift
Answer:
hydraulic lift pump moves the lift piston out in a series of movements. and a hydraulic brake moves it out in one short break.
The truck travels for 1.5 hours as it makes the 90 mile trip from the warehouse to the store. What was the average speed in miles per hour of the truck while driving to deliver the product to the waiting customers?
Answer: 60 mph
Explanation:
Given
Truck takes [tex]1.5\ hr[/tex] to make [tex]90\ mile[/tex] trip
The average speed is the ratio of total distance traveled to the total time taken.
[tex]v_{avg}=\dfrac{\text{Distance}}{\text{time}}\\\\v_{avg}=\dfrac{90}{1.5}\\v_{avg}=60\ mph[/tex]
A pelican flying along a horizontal path drops a fish from a height of 12.3 m. the fish travels 16.0m horizontally before it hits the water below. What is the Pelican's initial speed?
Answer:
10.1 m/s
Explanation:
Let the coordinates of the pelican's position be (x, y).
Now, since it is dropped from a height of 12.3 m, then initial velocity is zero and using Newton's 2nd law of motion, we have;
12.3 = 0 - ½gt²
½gt² = 12.3
t² = 12.3 × 2/9.8
t² = 2.51
t = √2.51
t = 1.5843 s
Now, it travels 16.0m horizontally before it hits the water below. Using the formula, distance = speed × time, we have;
16 = v_x•t
Thus;
16 = v_x × 1.5843
v_x = 16/1.5843
v_x = 10.1 m/s
Now, the velocity in the vertical y-direction is zero.
Thus;
v = √((v_x)² + (v_y)²)
v = √((10.1² + 0²))
v = 10.1 m/s
How dose the speed of the sound differ in water, iron, and Helium?
Answer:
air water iron helium
v(m/s) 280 2200 17780 39682
Explanation:
The speed of a wave depends on the physical properties of the medium where it travels, in the case of a longitudinal wave such as sound, it depends on the resistance to deformation (volume modulus and the density of the medium
v = [tex]\sqrt{ \frac{B}{ \rho } }[/tex]
in the mentioned materials they are constant
air water iron helium
B 1 10⁵ 2.2 10⁹ 140 10⁹ 0.05 10⁹
ρ 1.28 997 7874 1.26
v(m/s) 280 2200 17780 39682
A bullet from a policeman's handgun travels at 200 meters per second and has a mass of 0.02 kg.
What is the bullet's kinetic energy?
Answer:
K.E = 400
Explanation:
Given the following data;
Mass = 0.02kg
Velocity = 200m/s
To find the kinetic energy;
Kinetic energy can be defined as an energy possessed by an object or body due to its motion.
Mathematically, kinetic energy is given by the formula;
[tex] K.E = \frac{1}{2}MV^{2}[/tex]
Where;
K.E represents kinetic energy measured in Joules.
M represents mass measured in kilograms.
V represents velocity measured in metres per seconds square.
Substituting into the formula, we have;
[tex] K.E = \frac{1}{2}*0.02*200^{2}[/tex]
[tex] K.E = \frac{1}{2}*0.02*40000 [/tex]
[tex] K.E = 0.02*20000 [/tex]
K.E = 400
True or false blood gets oxygen and releases carbon dioxide in the heart
Answer:
FALSE
Explanation:
You breath in oxygen and your blood takes it through your body then you breath it out as carbon dioxide
What is the overall moment?
the zinc plate is coated with mercury
The illustration in figure below shows a uniform metre rule weighing 30 N pivoted on a wedge placed under the 40 cm mark and carrying a weight of 70 N hanging 2 from the 10 cm mark. The ruler is balanced horizontally by a weight W hanging from the 100 cm mark. Calculate the value of the weight W.
Answer:
W = 30 N
Explanation:
Applying the summation of torques about the wedge for equilibrium, taking the clockwise direction as negative. Since the ruler is balanced horizontally about the wedge. Therefore, the summation of all torques acting about the wedge must be equal to zero.
[tex](70\ N)(40\ cm - 10\ cm)-(30\ N)(50\ cm-40\ cm)-(W)(100\ cm - 40\ cm) = 0\\W(60\ cm) = (70\ N)(30\ cm)-(30\ N)(10\ cm)\\\\W = \frac{1800\ N.cm}{60\ cm}[/tex]
W = 30 N
Bobby and James were suffering from headaches. At seven o’clock, Bobby took the recommended two tablets of medicine for his headache; James took a dose of the powdered form of the same medicine. Using the assumption that the medicine effectively cures a headache, which person’s headache is likely to subside first? Use details and data from the students’ experiment and your prior knowledge to explain why you think this is.
Answer: James headache will subside first
Explanation: powder medicines usually get absorbed faster therefore having a quicker effect
which of the following is not a main function of the human's body nervous system?
Answer:
I can't see option dear
Explanation:
The bulk of geologic evidence indicates that the Earth's crust has been formed by unique, rapid ————- processes
Catastrophic
Uniformitarian
Please hurry!
A 2400W electric toaster is connected to a standard 120 V wall outlet. A family
measured their monthly toaster usage to be 6.5 hrs.
6
1) How much electrical energy (in kilowatt hours - kWh) did the toaster dissipate
during the measured month? (round to 1 decimal place & do not include units)
2) If the local power company charges $0.13/kWh, then calculate (in $) the monthly
total cost of this toaster. (round to 2 decimals & do not include units)
Answer:
1) 15.6
2) 2.03
Explanation:
The power output of the electric toaster, P = 2,400 W
The voltage rating of the power outlet, V = 120 V
The number of hours the toaster is used during a month = 6.5 hours
1) Electrical energy, E = Electrical power, P × Time, t
The electrical energy dissipated by the toaster, 'E', is given as follows;
E = 2,400 W × 6.5 hrs = 15,600 Wh = 15.6 kWh
The electrical energy dissipated by the toaster, during the measured month in kWh, E = 15.6
2) Let 'C' represent the monthly cost of toaster and let 'B' represent the amount charged by the local power company, we have;
The charges for (electrical) power by the local power company, B = $0.13/kWh
The monthly cost of the toaster, C = E × B
∴ C = 15.6 kWh × $0.13/kWh = $2.028
By rounding off to 2 decimals, the monthly cost of the toaster (in $), C ≈ 2.03.