Answer: false
Explanation:
An object of mass 300 kg is observed to accelerate at the rate of 4 m/s 2 . Calculate the force required to produce this acceleration
Answer:
F = 1200 N
General Formulas and Concepts:
Forces
Newton's Second Law of Motion: F = ma
F is force (in N)m is mass (in kg)a is acceleration (in m/s²)Explanation:
Step 1: Define
Identify variables
m = 300 kg
a = 4 m/s²
Step 2: Find Force
Substitute in variables [Newton's Second Law of Motion]: F = (300 kg)(4 m/s²)Multiply: F = 1200 NTopic: AP Physics 1 - Algebra Based
Unit: Forces
Look at the Sankey diagram for a filament light bulb below. If the bulb is used in a desk lamp, what is the efficiency of the bulb?
Answer:
The question does not state how the answer is to be entered. I would use 10% because that is most common.
Explanation:
You are using 300 J of energy to get 30 J of light energy. The fact that you can account for the left over energy is not relevant.
Efficiency = Work Out / Work In
Efficiency = 30 J / 300 J = 0.1
If you need this as a %, you can multiply by 100
Efficiency = 0.1 * 100 = 10%
Can someone help me with this? (Also C is incorrect)
Answer:
i think its d
Explanation:
The ______ describes the height or the wave measured from the central axis
Answer:
Amplitude
Explanation:
Answer:
the wave trough.
Explanation:
As is shown on the figure, wave height is defined as the height of the wave from the wave top, called the wave crest to the bottom of the wave, called the wave trough. The wave length is defined as the horizontal distance between two successive crests or troughs.
Phát biểu nào sau đây sai?
A. Hàm lượng cacbon trong thép cao hơn trong gang.
B. Sắt là kim loại màu trắng hơi xám, dẫn nhiệt tốt.
C. Quặng pirit sắt có thành phần chính là FeS2.
D. Sắt (III) hiđroxit là chất rắn, màu nâu đỏ, không tan trong nước.
Phát biểu nào sau đây sai?
A. Hàm lượng cacbon trong thép cao hơn trong gang.
B. Sắt là kim loại màu trắng hơi xám, dẫn nhiệt tốt.
C. Quặng pirit sắt có thành phần chính là FeS2.
D. Sắt (III) hiđroxit là chất rắn, màu nâu đỏ, không tan trong nước.
ANSWER:D. Sắt (III) hiđroxit là chất rắn, màu nâu đỏ, không tan trong nước.
___________________CARRY ON LEARNING
CAN YOU BRAINLEST ME
Why are the four largest moons of Jupiter called Galileans
Answer:
because it's discovered by Galileo Galilei
Answer:
Hello how are you ^0^
Explanation:
because it's discovered by Galileo Galilei
hope it's help you (^0^)
I NEED HELP ASAP! BRAINIEST TO THE CORRECT ANSWER. HELP ME NOW!
A 12v Light bulb uses 24v of power.
a) Calculate its resistance and the current at full power.
b) Calculate the resistance of a 100w mains light bulb and the current at full power.
c) Two bulbs are connected in series and supplied from the mains power at 230v. Calculate the current in the circuit. Assume that both bulbs operate at their working resistance.
d) Use your answer to part c) to comment on the brightness of the bulbs.
Answer:
a)[tex]\boxed{\mathfrak{Power(P)=\frac{Voltage(V)^2}{Resistance(R)} }}[/tex]
V = 12 VP = 24 W[tex]\implies \mathsf{24=\frac{12^2}{R} }[/tex]
[tex]\implies \mathsf{24R=12^2 }[/tex]
[tex]\implies \mathsf{24R=144 }[/tex]
=> R= 6 Ohms(Ω)
b)[tex]\boxed{\mathfrak{Power(P)=\frac{Voltage(V)^2}{Resistance(R)} }}[/tex]
Power (P)= 100 Wthese lights operate at the usual 240 volts direct from the main electricity supply. Therefore,
V = 240 V[tex]\implies \mathsf{100=\frac{240^2}{R} }[/tex]
R and 100 can interchange places
[tex]\implies \mathsf{R=\frac{240^2}{100} }[/tex]
[tex]\implies \mathsf{R=\frac{57600}{100} }[/tex]
=> R = 576 Ω
By Ohm's Law:
[tex]\boxed{\mathsf{Voltage(V)=Current(I) \times Resistance(R)}}[/tex]
=> 240 = I × 576
=>
=> I = 0.417 A
c)I don't know it's resistance,... so sorry
d)The brightness of the bulb in series is less than when they're placed individually.
For bulbs in series their resistance gets added to form the equivalent resistance of the two bulbs.
Their resistances are nothing but mere numbers and the sum of two numbers(positive of course) is greater than the numbers.
So, the effective resistance of some bulbs in series is more than the individual resistance.
And
Brightness, i. e., Power
[tex]\boxed{\mathfrak{Power \propto \frac{1}{Resistance} }}[/tex]
If resistance increases, Power decreases.
Here, the effective resistance was for sure larger, therefore resistance was increasing, hence power decreased taking brightness along with it.
Q1: You place two charges a distance r apart. Then you double each charge and double
the distance between the charges. How does the force between the two charges
change?
a) The new force is twice as large.
b) The new force is half as large.
c) The new force is four times as large.
d) The new force is four times smaller.
e) The new force is the same.
(HELP HELP)
Answer:
F1 = K Q Q / R^2
F2 = K 2Q * 2Q / (2 R)^2 = K 4 Q^2 / (4 R^2) = K Q^2 / R^2
F1 = F2 and (e) is the correct answer
The force between the two charges will be the same, so the new force is the same. Hence, option (e) is correct.
What is Electrical energy?
When put in an electromagnetic field, charged matter experiences a force due to the fundamental property of electric charge. Positive or negative electrical ions are possible. When two charges are in opposition to one another, they repel one another.
The term "neutral" refers to an object that has no net charge. The early understanding of the way charged particles interact is now referred to as classical electrodynamics, and it is still true for issues that do not demand taking into account quant phenomena.
As per the given data provided in the question,
F(1) = K (Q)(Q) / R²
After applying the given condition in the question,
F(2) = K (2Q) × (2Q) / (2 R)²
= K 4 Q² / (4 R²)
F(2) = K Q²/ R²
Which means that F1 = F2.
Therefore, it concludes that option (e) is correct.
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The wave speed is 3 x 10^8 m/s, and the frequency is 4 x 10^8 Hz. Calculate its wavelength.
Answer:
0.75m
Explanation:
V=FX
3×10^8=4×10^8×X
X= 3×10^8/4×10^8= 0.75m
The acceleration of an object in uniform circular motion always points toward the center of the circle. Question 2 options: True False
Answer:
The answer is true. Hope this helps!
"An object at rest starts accelerating. If it is going 120 m/s after traveling 202 meters, how quickly did it speed up?"
Answer:
this is just a guess bc i only looked at it for 5 seconds but i think 150 m/s
Investigators studying the effect of hitting a soccer ball with the head are using a force plate to look at the forces in ball collisions; the force when the ball hits a player's head will be similar. A 0.43 kg ball is launched at a force plate at 16 m/s. Smoothed data for the force versus time for the collision are shown in (Figure 1).
The integral of the function of the force applied to the time of application
of the force gives the impulse of the force.
The speed with which the ball rebounds from the plate is approximately
34.23 m/s.
Reasons:
Force = Rate of change of momentum
F × t = m·(v₂ - v₁)
Where;
Speed of the ball, v₁ = 16 m/s
v₂ = The speed with which the ball rebounds from the plate
The impulse, I, of the force is given by the area under the curve.
The height of the triangular curve, h = 2,500 N
The base length of the triangular curve = 7 ms.
Area of a triangle = [tex]\frac{1}{2}[/tex] × Base length × Height
Therefore, we have;
[tex]Area \ under \ the \ curve, \, I = \dfrac{0.007 \times 2500}{2} = 8.75[/tex]
8.75 = 0.48 × (v₂ - 16)
v₂ ≈ 34.23 m/s
Therefore, the speed with which the ball rebounds, v₂ ≈ 34.23 m/s.
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What's a real-life example where you have pushed or pulled on different objects and you noticed a difference in how they moved.
Easy pts! Will give Brainliest too!
Answer:
Explanation:
Think about hockey for little to no friction if you push on the puck it moves fast and far.
Now imagine taking the same puck and pushing it on gravel or grass it will not have the same motion.
At the end of the Giant Drop free fall ride, riders experience a large experience a large upward normal force to bring their falling bodies to a stop. Determine the normal force value required to accelerate a 52.1-kg physics student with an upward acceleration of 27.4 m/s/s.
Newton's second law allows us to find the force applied to the student so that it has an upward acceleration of 27.4 m / s² is:
F = 1.94 10³ N
Newton's second law says that the force is proportional to the product of the mass and the acceleration of the body.
∑ F = m a
Where F is the force, m the mass and the acceleration of the body.
A free body diagram is a diagram of the forces without the details of the bodies, in the attachment we have a free body diagram of the system.
They indicate that the student's mass is 52.1 kg and his acceleration is 27.4 m / s², let's write Newton's second law.
F - W = ma
F = m a + W
Body weight is.
W = mg
F = m (a + g)
We calculate.
F = 52.1 (27.4+ 9.8)
F = 1.94 10³ N
In conclusion using Newton's second law we can find the force applied to the student is:
F = 1.94 10³ N
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The brain is not a muscle, like the heart, that can be worked and built. Which BEST explains why a consistent exercise regime has a positive
impact on the brain?
ОА. .
Exercise generally requires a lot of thinking.
ОВ.
Exercise can eliminate all of the impact of stress.
OC.
Exercise helps maintain and create pathways in the brain.
OD.
Exercise is the only way to moderate the hormones that control the brain.
Regular exercise has a positive impact on the brain, and the best explanation for this is that exercise helps maintain and create pathways in the brain (Option C).
1. The brain is a complex organ composed of billions of nerve cells called neurons. These neurons communicate with each other through pathways, forming a vast network.
2. When we engage in physical exercise, it increases blood flow to the brain. This enhanced blood flow delivers more oxygen and nutrients to the brain cells, promoting their overall health and functioning.
3. Exercise also stimulates the release of various chemicals in the brain, such as neurotransmitters and growth factors. These substances play a crucial role in the growth, development, and maintenance of brain cells.
4. Additionally, regular exercise has been found to promote the formation of new connections between neurons, a process known as neuroplasticity. These connections, also called synapses, are essential for learning, memory, and overall cognitive function.
5. By engaging in consistent exercise, individuals can enhance neuroplasticity, allowing their brains to adapt and reorganize in response to new experiences and challenges.
6. Moreover, exercise has been shown to reduce the risk of age-related cognitive decline and neurodegenerative diseases, such as Alzheimer's disease. It may also help improve mood, reduce stress, and enhance mental well-being.
7. In summary, while the brain is not a muscle that can be directly exercised, regular physical exercise positively impacts the brain by promoting neuroplasticity, improving blood flow, releasing beneficial chemicals, and reducing the risk of cognitive decline.
Therefore, the best explanation for why a consistent exercise regime has a positive impact on the brain is that exercise helps maintain and create pathways in the brain (Option C).
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Imagine everyone in the United States exhibited the character traits we have been discussing. In what ways would America be different?
Now imagine no one in American exhibited any of those character traits. In what ways would America be different?
Answer:
Characterization is the process by which the writer reveals the personality of a character. Characterization is revealed through direct characterization and indirect characterization. Direct Characterization tells the audience what the personality of the character is.
A 925 kg car accelerates uniformly from rest to a velocity of 25.0 m/s in 10.0s. What is the net force on the car?
Answer:
A 925 kg car accelerates uniformly from rest to a velocity of 25.0 mls south in 10.0 s. What is the net force acting on the car during this time?
F=(925*25)/10
F=2312.5 N to south
Hi there!
We can begin by calculating the acceleration experienced by the car.
vf = vi + at
The initial velocity is 0 (at rest), so:
25 = at
25/10 = a = 2.5 m/s²
Using Newton's Second Law:
∑F = ma, where:
∑F = net force (N)
m = mass (kg)
a = acceleration (m/s²)
Plug in the values:
∑F = 925 · 2.5 = 2312.5 N
what type of telescope can be used routinely on the surface of the earth during the day?
Answer:
Radio telescopes .
Explanation:
They have a modest size that can't make out as much detail (have a lower resolution) than visible light telescopes
mass is conserved in a reaction if the of the initial reactant masses equals the of the masses of
Answer:
mass of the products
Explanation:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
How does the mass of an object affect its acceleration?
Answer:
the mass + the 1 constant g-force = the speed without adding air resistance
Explanation:
osmium it the most tightly packed alloy in the world so for that it will have a faster acceleration
frequence = ?
lambda = 0.5m
Vacocity = 340m/s
Talking about physic waves things.
Answer:
Below
Explanation:
To find the frequency of a wave you can use this formula :
f = v / λ
f = 340m/s / 0.5m
f = 680 Hz
Hope this helps!
I need this asap pls I will mark brainliest!
Answer:
13.73 degrees farenheit
-10.15 degrees Celsius
Explanation:
hope this helps
why planets do not twinkle
Answer:
Explanation:
Basically because they are big and relatively near.
The light coming from a star travels a huge distance and is acted upon by the earth's atmosphere with causes all sorts of shifts. What we are seeing twinkle is caused by these shifts, for the most part caused by atmospheric density and heat.
The beam from a planet is not narrow enough to be affected the way the stars are.. If you were out in space looking at all this, the stars would not appear to twinkle either.
8.) You push on a box with 100N of force. The box has a mass of 15 kg. What is
the acceleration of the box?
Answer:
he pushed 192,753,636,363
Explanation:
A non-uniform rod XY of mass 40 kg and length 5.0 m lies on the horizontal ground. Its centre of gravity is 2.0 m from the end X. Calculate the vertical force P, that will just be sufficient to lift the end Y from the ground. Why would the force P, if applied at the end X not be sufficient to lift the end X from the ground? (8 = 10.0 (SC/GCE) ms-2)
The vertical force P, that will just be sufficient to lift the end Y from the ground is 600 N.
If the force P is applied at end X, it will not be sufficient to lift end X from the ground because the force P is acting downwards.
The sketch of the rod is presented as follows;
|---- 2 ----------|---------------------- 3 ----------------------|
X-----------------------------------------------------------------Y
P ↓
40 kg
Take moment about the center of gravity;
P(2) = 40 x g (3)
2P = 40 x 10 (3)
2P = 1200
P = 600 N
Thus, the vertical force P, that will just be sufficient to lift the end Y from the ground is 600 N.
If the force P is applied at end X, it will not be sufficient to lift end X from the ground because the force P is acting downwards.
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Match the labels to the correct
location on the roller coaster.
At the bottom left,
Increasing potential energy.
At ascending,
Increasing kinetic energy.
At the peak,
Greatest potential energy.
At the descending,
Greatest kinetic energy.
Peter’s teacher tells him that he should not place his electric stereo near the edge of a pool because the water in the pool is a conductor. What does she mean when she says that the water is a conductor?
a
Water is a type of electrical energy.
b
Water damages electric circuits.
c
Electric charges cannot flow without water.
d
Electric charges move through the water in the pool.
Answer:
D- Electric charges move through the water in the pool.
Explanation:
I got it right on my test
By moving her arms outward, an ice skater speeds up a spin, while moving her arms inward slows down a spin. Question options: True False
false
ITS TURE.When there is no torque acting on a body, its angular momentum is constant. Net force changes momentum, while net torque changes angular momentum.
Answer: false
Explanation:
would be equal to 0 miles.
If you travel from home, to school and back home, the measure of
distance
velocity
displacement
speed
Answer:
as we know Speed=Distance÷Time
Distance=Speed×Time
Velocity=Displacement÷Time
Displacement=Velocity×Time
u haven't given the speed and all give it and I will tell the answer
true or false
your weight would be the same on the moon as it is on the earth
Answer:
False
Explanation:
You could weigh less on the moon then on Earth because the moon has a smaller gravitational force compared to Earth.