Answer:
a = 5 m / s² and x = 562.5 m
Explanation:
Let's apply the kinematics relations
v = v₀ + at
v² = v₀² + 2a x
In this case, as the car stops, its final speed is zero (v = 0) and the acceleration must be opposite to the speed, that is, negative
0 = v₀ - a t
a = v₀ / t
let's calculate
a = 75/15
a = 5 m / s²
let's look for the distance
0 = v₀² - 2a x
x = v₀² / 2a
let's calculate
x = [tex]\frac{75^2}{2 \ 5 }[/tex]
x = 562.5 m
An Led Light bulb is rated 14 W. How much energy will the light bulb consume if it is on for 1 hour (3600 seconds)
Answer:
18kW
Explanation:
very LED bulb has a power rating in terms of Watt-hour. It gives the power consumption per hour. For e.g. a 100W light bulb consumes 100W of electricity per hour. If left 'on' for 10 hours, a 100W light bulb costs 1kW and 1 unit of electricity is burned. Because 1 unit = 1 Kw of electricity.
I calculated my electricity consumption in 1 hour with LED Bulb as follows-
LED Bulbs power rating- 15 watt
quantity- 1
No. of hours a day – 12
Wattage in 1 hour – 12(time) x 15(load) x 1(quantity) = 180W = .18kW
So consumption units of power with a LED Bulb consume in 1 hour= .18 Units (because 1 KW = 1 unit)
identify global climate zones and characteristics of each
research the different time zone around the world, and characteristics of each
Please help me please and you will get the brainlist
Answer:
4. Force = 178.6 Newton.
5. Acceleration = 2.28 m/s².
6. Force = 178.6 Newton.
Explanation:
4. Given the following data;
Acceleration = 3.8 m/s²
Mass = 47kg
Force = mass * acceleration
Force = 47 * 3.8
Force = 178.6 Newton.
5. Given the following data;
Force = 785N
Mass = 345kg
Acceleration = force/mass
Acceleration = 785/345
Acceleration = 2.28 m/s²
6. Given the following data;
Acceleration = 6m/s²
Force = 32N
Mass =force/acceleration
Mass = 32/6
Mass = 5.33 kilograms
A physics teacher is reheating her leftover pizza lunch in the very old teacher breakroom microwave. The microwave is so old that it doesn't even turn the food as it cooks. When the teacher takes her food out and eats it, she discovers that parts of the pizza are scalding hot, while other parts are still very cold. She explains to the students that a microwave works by producing standing waves that result in heating. She asks the students to explain why some parts of the pizza are hot while others are still cold. Below are their responses:
Answer: At the antinodes of a standing wave, the wave is shaking very rapidly, causing those parts of the pizza to get hot. At the nodes, the wave is not shaking much at all, causing those parts of the pizza to stay cold."
Explanation:
antinodes vibrate and are the opposite of nodes which are stationary.
Some parts of the pizza are hot while others are still cold. Because the antinodes of a standing wave shake very quickly, causing the hot spots on the pizza to appear.
What are the differences between nodes and antinodes?The fact that there are locations along the medium that appear to be standing still is a feature of every standing wave pattern.
The term "node" refers to these sites, which are also known as "points of no displacement." Other sites along the medium are subjected to vibrations with substantial positive and negative displacements.
During each vibrational cycle of the standing wave, these are the locations that experience the most displacement. These points are termed "antinodes" because they are the polar opposites of nodes.
The antinodes of a standing wave shake very quickly, causing the hot spots on the pizza to appear. The wave isn't moving very much at the nodes, therefore those areas of the pizza stay cold."
Hence some parts of the pizza are hot while others are still cold.
To learn more about antinodes refer to the link;
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+
CaCl 2
+
_C2HCl3
C2H2C14
H 20
+
Ca(OH) 2 →
Brainliest if right.
Someone fires a 0.04 kg bullet at a block of wood that has a mass of 0.5 kg. (The block of wood is sitting on a frictionless surface, so it moves freely when the bullet hits it). The wood block is initially at rest. The bullet is traveling 300 m/s when it hits the wood block and sticks inside it. Now the bullet and the wood block move together as one object. How fast are they traveling?
Answer:
Explanation:
Remark
This is a conservation problem.
The momentum before impact = momentum after impact
momentum before
m = 0.04 kg
v = 300 m/s
momentum after
m = 0.5 kg + 0.04kg That's the mass of the block and bullet
v = ?
Solution
0.04 * 300 = 0.54 * x
12 kg m/s = 0.54 kg * x
12 / 0.54 = x
x = 22.22 m/s
Look at the diagram B. What is happening in diagram B ?
Answer:
a lens is scattering light
Explanation:
Diagram B shows a plano concave lens. Plano-Concave lenses bend parallel input rays to diverge from one another on the output side of the lens and hence have a negative focal length.
In the given figure, a Plano concave lens is shown. It scatters light. The image is formed in front of lens. The formed image is virtual.
Hence, the correct option is (c) "a lens is scattering light".
Which quantity is most closely related to the speed of gas particles? (2 points)
A The temperature of the gas
B The number of molecules in the gas
C The density of the gas
D The total volume of the gas
Quantity is most closely related to the speed of gas particles is the temperature of the gas.
Specifically, the speed of the molecules in a gas is dependent on its temperature (the higher the temperature the faster the gas molecules move). Another way to think of it is that the temperature of a gas is a measure of the average kinetic energy of that gas.
What is temperature ?"Temperature is the measure of hotness or coldness expressed in terms of any of several scales, including Fahrenheit and Celsius. Temperature indicates the direction in which heat energy will spontaneously flow—i.e., from a hotter body (one at a higher temperature) to a colder body (one at a lower temperature)."
Know more about temperature here
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