Answer:
14.868
Density equals mass divided by volume
If a cheetah can maintain a constant speed of 5.00 m/s, how far does it travel in 1.00 minute?
Answer: 300 m/m
Explanation: 5.00 m/s • 60 =300/m/m
Rebecca is pushing her motorcycle down the road to a repair shop with a certain net force. If the net force is doubled, by how much does the acceleration change?
Answer:
If the net force is doubled the acceleration change in the same proportion, that is to say, it is doubled too.
Explanation:
We have that:
[tex] F = ma [/tex]
From the equation above we see that the acceleration is directly proportional to the force, so hence if the force is doubled:
[tex] F_{1} = ma_{1} [/tex]
[tex] 2F_{1} = ma_{2} \rightarrow a_{2} = 2\frac{F_{1}}{m} = 2a_{1} [/tex]
Therefore, If the net force is doubled the acceleration change in the same proportion, that is to say, it is doubled too.
I hope it helps you!
J.J. Thomson discovered the electron in 1897. In 1904, he proposed a model of an atom, describing that there was an equal distribution of negative and positive charges throughout the atom. In 1909, Ernest Rutherford tested J.J. Thomson’s model by shooting positive particles at gold foil. Based on Thomson's model, it was predicted that the particles would fly through the foil with a small amount deflected back. Analyzing the results, Rutherford discovered that more of the particles bounced back than expected. Which of the following best explains how the results of Rutherford’s experiment affected Thomson’s widely-accepted atomic model?
Answer:
the answer is b : Rutherford’s results supported parts of Thomson's model, but also provided new data and interpretations.
Explanation:
i read that and read the answers this is only logical one
a rocket is fired upwards with an intial velocity of 46.5 m/s. find the rocket's maximum height
Answer:
The value is [tex]s = 110.32 \ m[/tex]
Explanation:
From the question we are told that
The initial velocity is u= 46.5 m/s
Generally from kinematic equations we have that
[tex]v^2 = u^2 + 2as[/tex]
Here [tex]a = -g = -9.8 \ m/s^2[/tex]
The negative sign is because it is moving against gravity
At maximum height v = 0 m/s
So
[tex]0 = (46.5)^2 + 2* (-9.8)s[/tex]
=> [tex]s = 110.32 \ m[/tex]
A train slows down as it rounds a sharp horizontal turn, going from 100 km/h to 60.0 km/h in the 14.0 s it takes to round the bend. The radius of the circle is 160 m. Compute the total acceleration and the angle at the moment the train speed reaches 60.0 km/h.
Answer:
The magnitude of the total acceleration of the train is approximately 1.909 meters per square second.
The direction of total acceleration with respect to radial acceleration is approximately -24.578º.
Please note that negative sign indicates that train is decelerating.
Explanation:
From Physics, we know that magnitude of the acceleration experimented by the train ([tex]a[/tex]), measured in meters per square second, while rounding the bend is the Pythagorean identity involving radial and tangential accelerations ([tex]a_{r}[/tex], [tex]a_{t}[/tex]), measured in meters per square second:
[tex]a = \sqrt{a_{t}^{2}+a_{r}^{2}}[/tex] (Eq. 1)
If we assuming that train decelerates at constant rate, then each component is determined by following expressions:
[tex]a_{t} = \frac{v_{f}-v_{o}}{t}[/tex] (Eq. 2)
[tex]a_{r} = \frac{v_{f}^{2}}{R}[/tex] (Eq. 3)
Where:
[tex]v_{o}[/tex], [tex]v_{f}[/tex] - Initial and final speeds, measured in meters per second.
[tex]t[/tex] - Deceleration time, measured in seconds.
[tex]R[/tex] - Bend radius, measured in meters.
If we know that [tex]v_{o} = 27.778\,\frac{m}{s}[/tex], [tex]v_{f} = 16.667\,\frac{m}{s}[/tex], [tex]t = 14\,s[/tex] and [tex]R = 160\,m[/tex], then each acceleration component is calculated:
[tex]a_{t} = \frac{16.667\,\frac{m}{s}-27.778\,\frac{m}{s} }{14\,s}[/tex]
[tex]a_{t} = -0.794\,\frac{m}{s^{2}}[/tex]
[tex]a_{r} = \frac{\left(16.667\,\frac{m}{s} \right)^{2}}{160\,m}[/tex]
[tex]a_{r} = 1.736\,\frac{m}{s^{2}}[/tex]
Then, the magnitude of the total acceleration of the train is:
[tex]a = \sqrt{\left(-0.794\,\frac{m}{s^{2}} \right)^{2}+\left(1.736\,\frac{m}{s^{2}} \right)^{2}}[/tex]
[tex]a \approx 1.909\,\frac{m}{s^{2}}[/tex]
The magnitude of the total acceleration of the train is approximately 1.909 meters per square second.
After that, we obtain the angle of acceleration by using the following trigonometric expression:
[tex]\theta = \tan^{-1} \frac{a_{t}}{a_{n}}[/tex] (Eq. 4)
Where [tex]\theta[/tex] is the direction of total acceleration with respect to radial acceleration, measured in sexagesimal degrees.
If we get that [tex]a_{t} = -0.794\,\frac{m}{s^{2}}[/tex] and [tex]a_{r} = 1.736\,\frac{m}{s^{2}}[/tex], the direction of total acceleration experimented by the train is:
[tex]\theta = \tan^{-1}\left(\frac{-0.794\,\frac{m}{s^{2}} }{1.736\,\frac{m}{s^{2}} } \right)[/tex]
[tex]\theta \approx -24.578^{\circ}[/tex]
Please note that negative sign indicates that train is decelerating.
The direction of total acceleration with respect to radial acceleration is approximately -24.578º.
Stacey sees a person pushing a lawn mower across level ground. She is
walking at constant speed and pushing the mower with constant force.
Could the lawn mower move faster than the person is walking?
Answer:
No, the lawn mover will maintain the same speed as the person pushing itExplanation:
To understand this, we need to reflect back to the law of motion, the first law to be précised.
It states that "A body will continue to be at rest or uniform/constant motion unless acted upon by an external force which is greater than the current force"
So we can see that since the person continues to apply the same force at the same speed, the effect on the mover will be the same.
what is a convalent bond
I JUST NEED A ANSWER DONT CARE WHAT IT IS
Answer: A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms.
Hope that helps! :)
What is the net force on the runner below if the
applied force is + 40 N and the resistive force is -2
N?
Answer:
What is the net force on the runner below if the
applied force is + 40 N and the resistive force is -2
N?
Explanation:
What is the net force on the runner below if the
applied force is + 40 N and the resistive force is -2
N?
What is the velocity of a car that travels 400meters in 16 seconds
Answer:
The answer is 25 m/sExplanation:
The velocity of the car can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{400}{16} \\ [/tex]
We have the final answer as
25 m/sHope this helps you
give five examples of renewable energy resource
Answer:
solar energy, wind energy, geothermal energy, hydropower, and Bioenergy
Answer:solar energy, wind energy, geothermal energy, hydropower, and Bioenergy
Explanation:let me know if that helped
3. A satellite orbits Earth at a constant speed.
What part of the satellite's motion is
changing?
A speed
B friction
C inertia
D acceleration
you weigh 500n,what stops you from falling to the center of the earth
Answer:
bedrock?
Explanation:
The ground is in the way.
On a aircraft carrier, a fighter jet goes from rest to a velocity of 250 mph (miles per hour) when it takes off. It does this in 3 seconds. What is it acceleration ?
Answer:
37.25m/s
Explanation:
Acceleration is the change in velocity of an object with respect to time.
Acceleration = velocity/time
Given
Velocity = 250mi/hr
Convert to m/s
1mile = 1609.344m
1hr = 3600s
250mi/hr = 250mi * 1609.344/1 * 3600
250mi/hr = 402366/3600
250mi/hr = 111.76m/s
Time = 3 seconds
Get the acceleration:
Acceleration = 111.76/3
Acceleration = 37.25m/s
Hence the acceleration is 37.25m/s
A person weighing 645 N climbs up a ladder to a height of 4.55 m. What is the
increase in gravitational potential energy?
Answer:
P.E = 2934.75
Explanation:
Potential energy can be defined as an energy possessed by an object or body due to its position.
Mathematically, potential energy is given by the formula;
[tex] P.E = mgh[/tex]
Where, P.E represents potential energy measured in Joules.
m represents the mass of an object.
g represents acceleration due to gravity measured in meters per seconds square.
h represents the height measured in meters.
Given the following data;
Weight =645
Height = 4.55
[tex] P.E = mgh[/tex]
But we know that weight = mg = 645N
Substituting into the equation, we have;
[tex] P.E = 645 * 4.55 [/tex]
[tex] P.E = 2934.75 J[/tex]
Potential energy, P.E = 2934.75 Joules.
According to the fundamental law of nature called the conservation of energy, the total
amount of energy in a system _____ no matter what happens inside the system.
A) increases B)remains constant C)decreases
Answer: B, remains constant.
A car starts from a spotlight and is traveling with a velocity of 10 m/s Ein
20 seconds. What is the acceleration of the car?
Answer:
ANSWER
Initial Velocity (u) = 10 m/sec
Acceleration (a) = 5 m/sec
2
Distance (s) = 30 m
Final velocity (v) = ??
Using Newton's Third law of Motion,
v
2
=u
2
+2as
v
2
=10
2
+2×5×30
v
2
=100+300
v
2
=400
v =
400
v = 20 m/sec
_____________________________
ANSWER =
FINAL VELOCITY = 20 m/sec
Answered By
toppr
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More Questions by difficulty
EASY
MEDIUM
HARD
Explanation:
it's easy
What is a quantity Described completely by its magnitude
Answer:
Scalar
Explanation:
A physical quantity that is completely described by its magnitude; examples of scalars are volume, density, speed, energy, mass, and time. Other quantities, such as force and velocity, have both magnitude and direction and are called vectors.
Help plz
Which of the following graphs best represents the expected experimental data between the force of gravitational attraction between two varying masses positioned 1 m apart
Answer:
I'm pretty sure it's D
Explanation:
because the greater the mass, the greater the gravitational pull is on it. but you probably shouldn't take my word on it, lol
1. A ball is dropped from the top of a cliff that is 38 meters tall. Calculate
the ball's impact velocity.
20 points
O +744.8
+27.29
+372.4
+19.30
Answer:
+27.29
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f}^{2} =v_{o}^{2}+2*g*x[/tex]
where:
Vf = final velocity [m/s]
Vo = initial velocity = 0 ( the ball is dropped)
g = gravity acceleration = 9.81 [m/s²]
x = distance = 38 [m]
Vf² = 0 + (2*9.81*38)
[tex]v_{f}=\sqrt{2*9.81*38} \\ v_{f} = 27.3 [m/s][/tex]
PLEASE ANSWER
For an object launched horizontally the acceleration in the y direction will always be ____.
Answer: initial velocity in y direction
Explanation: coz i did dis before XD
A penny is dropped from the top of a 240.0 m building and is in
free fall. How long will it take
the penny to hit the ground?
O 24.5 sec
3.5 sec
7 sec
O 5 sec
Answer:
It would take 5
18.3
Explanation:
It depends on how fast it comes and the timing
A mischievous cat sees a flowerpot sitting at rest on a windowsill. If it takes 1.2 s for the flowerpot to fall from the window, how high up was the window?
Given that,
Initial speed of a cat is 0 because it was at rest.
If it takes 1.2 s for the flowerpot to fall from the window, we need to find the height reached by the cat.
Using second equation of motion to find it as follows :
[tex]d=ut+\dfrac{1}{2}at^2[/tex]
Put u = 0 and a = g
[tex]d=\dfrac{1}{2}gt^2\\\\d=\dfrac{1}{2}\times 9.8\times (1.2)^2\\\\d=7.05\ m[/tex]
So, it will move to a height of 7.05 m.
A 1.5 kg block is pulled across a horizontal surface that has a coefficient of kinetic friction of 0.60. a. What is the force of friction exerted by the surface on the block?
Answer: 8.82 N
Fg= (1.5) (9.8) = 14.7
Fk= (0.60) (14.7) = 8.82
Convert the following from °C to K: For example, 0°C = 273 K, and -100°C = 173 K.
50°C
10°C
17°C
-40°C
Explanation:
To convert from °C to K, we use the expression below;
tK = t°C + 273
tK = temperature in Kelvin
t°C = temperature in celcius
A. 50°C;
tK = 50 + 273 = 323K
B. 10°C;
tK = 10 + 273 = 283K
C. 17°C;
tK = 17 + 273 = 290K
D, -40°C
tK = -40 + 273 = 233K
On a wall, there are several 1 - 4 mm elongated drops with a large bloody rectangular patch in the center. The rectangle's long side faces toward the bottom of the wall. Running through the pattern are four smear lines about 0.5 - 1 cm apart and perpendicular to the bottom of the wall. No other marks are found on the other walls. Which best explains the sequence of events?
A. The victim was hit in the head with a blunt object, his face hit the wall, and his hand slid down along the wall as he collapsed.
B. The victim was shot with a gun and collapsed on the floor beneath.
C. The victim's throat was cut and he collapsed on the floor.
D. The victim was stabbed and cut multiple times before collapsing on the floor.
Answer: this might be wrong but my answer is A.
Explanation: it said "Running through the pattern are four smear lines about 0.5 - 1 cm apart and perpendicular to the bottom of the wall." and "perpendicular" is like not that big and not that small and A is "and his hand slid down along the wall as he collapsed." so I think it is A.
A horse is riding 9m/s. In two seconds it slows down to 1m/s, what is the acceleration of the horse.
Answer:
-4m/s²
Explanation:
Given parameters:
Initial velocity = 9m/s
Final velocity = 1m/s
Time taken = 2s
Unknown:
Acceleration = ?
Solution:
The acceleration of a body is the change in velocity of a body with time.
Acceleration = [tex]\frac{Final velocity - Initial velocity }{time}[/tex]
Insert the parameters and solve;
Acceleration = [tex]\frac{1 - 9}{2}[/tex] = -4m/s²
We can say, the car is decelerating at a rate of 4m/s²
Ashley rides her bike 200 meters in 20 seconds. what is her speed?
Answer: 10 meters
Explanation:
Divide 200 by 20, for 20 seconds.
200 ÷ 20 = 10
The answer to the question is 10.
When two strands of DNA line up, adenine always pairs up with _____.
guanine
phosphate
thymine
cytosine
1. What is the density of a piece of cork that has a mass of 0.65 g and a volume of 2.71 cm??
Answer:
0.240 g/cm3
Explanation:
If objects in free fall near the surface of Earth accelerate downward at 9.81 meters per second, why does a feather not accelerate at this rate when dropped near the surface of Earth? A. The feather's mass is too small. B. The air spaces in the feather interfere with gravity. C. Air friction acts on the feather. D. The shape of the feather propels it through the air.
Answer:
the answer of this question is B
The reason why the feather does not accelerate at this rate when dropped near the surface of Earth is because of Air friction acts on the feather.
The free-falling of an object is said to have an acceleration of 9.8 m/s/s, downward (on Earth).
The Gravity or its acceleration due to it is regarded as 9.81 meters per second square, on the earth surface, because of the size of Earth and the distance we are on its surface from its center.
In space, gravity are said to be constant.
Conclusively, due to air resistance, acceleration throughout a fall gets less than gravity because it affects the movement of the falling object by slowing it down.
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