Answer:
scalar d = 54000 m , v_average = 16,667 m / s
vector d = -4000 m , moved 4000 to the west
v_average = 0
Explanation:
his is a uniform motion exercise, but we must be careful with quantities that are scalars and vector quantities
The distance traveled is a scalar
d = d₁ + d₂
d = 25000 + 29000
d = 54000 m
the speed is a scalar, in the exercise it is not specified if the speed of each trajectory or the average speed. Therefore we will calculate the two
v₁ = d₁ / t₁
v₁ = 25000/1500
v₁ = 16,667 m / s
v₂ = 29000/1740
v₂ = 16,667 m / s
Since the two speeds are equal, the average speed is
v = (v1 + v2) / 2
v_average = 16,667 m / s
now let's calculate the displacement that is a vector, so it has direction in addition to modules
suppose the eastward direction is positive and the bold are vectors
d = d₁ - d₂
d = 25000 - 29000
d = -4000 m
this means that it moved 4000 to the west
velocity is a vector, we assume positive eastward movement
v₁ = 16,667 m / s
v₂ = - 16,667 m / s
v_average = (v1 -v2) / 2
v_average = 0
Select the name of the stave that musicians use to indicate high pitched notes
Answer:
This clef is used to represent sounds from the middle octave up (middle and high) and is often the best known. The treble clef is located on the second line of the staff, that is, it is written "in second". Thus, the second line will be called the sun and the other notes will be established from this point.
Explanation:
A ship sets out to sail to a point 154 km due north. An unexpected storm blows the ship to a point 72 km due east of its starting point. How far must it now sail to reach its original destination
Answer:
170kmExplanation:
If a ship sets out to sail to a point 154 km due north and an unexpected storm blows the ship to a point 72 km due east of its starting point, then the ships distance from the original destination can be gotten by finding the displacement of the ship and this can be gotten by using pythagoras theorem.
Let D be the unknown displacement
According to the theorem;
D² = 154² + 72²
D² = 23716 + 5184
D² = 28900
D = √28900
D = 170km
This means that the ship must now sail a distance of 170km for it to reach its original destination.
500 cm³ of water at 100°C is added to another 500 cm³ of water at a temperature of 30°C. Assuming no heat is lost to the surrounding, what is the final temperature of the mixture when thermal equilibrium is achieved?
Answer: 35 degree Celsius
Explanation: Subtract both the temperatures And divide by two.
A student conducts an experiement in their class. They determine that when you increase a mass by four times it's original amount, the acceleration is experiences also drops to 1/4th of it's original value. What value was the student holding constant during this experiment? a Force b Mass c Acceleration d Weight
Answer:
Correct answer is A Force
Explanation:
The experiment that the students are carrying out is to verify Noten's second law, which has the equation
F = m a
where F is the force, the acceleration and m the mass of the body.
In this case, they indicate that slats were increased 4 times and the acceleration decreased 4 times, therefore when replacing
F = (4m) (a/4)
from here we can see that the force remains constant.
Correct answer is A
A man dropped a dime in a wishing well , he heard it 5 sec later ..Find distance traveled if moving at 10 m/s 2
Answer:
The distance traveled is 109.58 m
Explanation:
The Speed of sound in air = 344 m/s
Let the time in which the dime dropped by the man reach an impact in the well = t₁
Let the time in which the sound travel from the well to the man = t₂
Then
1/2× 10 × t₁² = 344 × t₂ which gives;
5 × t₁² = 344 × t₂.........................(1)
Also the total time before the man heard the dime = t₁ + t₂ = 5
Therefore;
t₂ = 5 - t₁
Substituting the value of t₂ in equation (1), we have;
5 × t₁² = 344 × (5 - t₁)
5·t₁² + 344·t₁ - 1720 = 0
Using the quadratic formula, we have;
[tex]x = \dfrac{-b\pm \sqrt{b^{2}-4\cdot a\cdot c}}{2\cdot a}[/tex]
Which gives;
[tex]t_1 = \dfrac{-344\pm \sqrt{344^{2}-4\times 5\times (-1720)}}{2\times 5}[/tex]
t₁ = 4.68 s or -73.48 s
Therefore, with the positive value for t₁ = 4.68 s, we have
The distance = 1/2× 10 × 4.68² = 109.58 m
The distance traveled = 109.58 m.
(PLEASE HELP!!) Identify two types of motion where an object's speed remains the same while it continues to change direction.
Can someone plz tell me how to solve this step by step
Answer:
Explanation:
T=2π√l/g
to solve this for l we have to remove the square root in order to finish square root we have to take square on both side so the equation become
T²=4π²l/g
multiplying g on both side
T²g=4π²l
now dividing 4π² on both side
T²g/4π²=l
so l=T²g/4π²
help its due september 2.
Answer:
see below
Explanation:
1) the object is not equilibrium.
the forces are unbalanced.
4 N towards right to make it balance/equilibrium
2) the object is not equilibrium.
the forces are unbalanced.
5 N towards right to make it balance/equilibrium
3) the object is in equilibrium.
the forces are balanced.
4) the object is not equilibrium.
the forces are unbalanced.
9 N towards left to make it balance/equilibrium
5) the object is not equilibrium.
the forces are unbalanced.
4 N towards right to make it balance/equilibrium
6) the object is not equilibrium.
the forces are unbalanced.
1 N towards right to make it balance/equilibrium
7) the object is not equilibrium.
the forces are unbalanced.
6 N towards right to make it balance/equilibrium
8) the object is not equilibrium.
the forces are unbalanced.
1 N towards left to make it balance/equilibrium
9) the object is not equilibrium.
the forces are unbalanced.
3 N towards right to make it balance/equilibrium
10) the object is not equilibrium.
the forces are unbalanced.
1 N towards left to make it balance/equilibrium
Answer: and Explanation:
1) the object is not equilibrium.
the forces are unbalanced.
2) the object is not equilibrium.
the forces are unbalanced.
3) the object is in equilibrium.
the forces are balanced.
4) the object is not equilibrium.
the forces are unbalanced.
5) the object is not equilibrium.
the forces are unbalanced.
6) the object is not equilibrium.
the forces are unbalanced.
7) the object is not equilibrium.
the forces are unbalanced.
8) the object is not equilibrium.
the forces are unbalanced.
9) the object is not equilibrium.
the forces are unbalanced.
10) the object is not equilibrium.
the forces are unbalanced.
A car is traveling south at a speed of 54 miles per hour and then begins traveling at a speed of 55 miles per hour but continues traveling in the same direction. Which of the following has changed?
A. mass
B. volume
C. velocity
D. density
Explanation:
VELOCITY: BECAUSE ITS A VECTOR QUANTITY
What is the average speed of a car that traveled 300 meters in 5.5 seconds?
Answer: 54.55 m/s
Explanation:
Distance = 300 m
Time = 5.5 s
Average Speed = Total Distance/Total Time
= 300/5.5
= 54.55 m/s
Hope this helped..
what is the mass of density=2 g/mL volume= 20mL?
m = 40 g
Explanation:d = m/V => m = d×V
m = 2g/ml×20ml
= 40 g
The speedometer of a car moving to the east reads 100 km/h. It
passes another car moving to the west at 100 km/h. Do both cars
have the same speed? Do they have the same velocity?
The speedometer of the car moving towards shows 100 km/h which passes another car moving in the west with a speed of 100 km/h, so both cars have the same speed and velocity, but the resultant speed is 200 km/h.
What is Velocity?In terms of physics, velocity is a vector measurement of the motion's direction and speed. The rate of change in an object's position relative to a frame of reference and time is a more precise definition of velocity.
Simply put, the concept of velocity informs us of the rate at which an object is travelling in a specific direction. It indicates the rate of movement of an object.
There are several types of velocity :
Uniform velocityNon-uniform velocityInstantaneous velocityAverage velocityTherefore, both the cars are having same speed.
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solve this questions please
Answer:
10.37×10³j
Explanation:
hope this helps you !!!
A student measures her height with a meter stick and finds that she is about 1.5 m tall. How can she measure her height with greater accuracy and precision?
Answer:
She should use a measuring tape
Explanation:
A student measures her height with a meter stick and gets a result of 1.5 m tall. This may not be as accurate as possible due to the fact that a meter stick has a maximum length of 1m which means an error could have occurred when she had to mark a point and then measure the remaining 0.5m.
She can however measure her height with greater accuracy and precision with a meter tape which has a wider measurement range and there won’t be any need to measure twice.
Mr. Ben drove from Town A to Town B. For the first 3 h, he traveled at an average speed of
60 km/h, and after that, he drove at another average speed of 70 km/h. If the distance
between Town A and B is 460 km, what was the total time for the whole journey?
Answer:
It’s 7 hours
Explanation:
You have to use the formula your teacher has given to you plug in the numbers then solve be sure to use a calculator made for physics it helps a lot :)
perfect bouncy ball would continue bouncing the same hight forever. but in reality the ball stops bouncing because energy is lost to
A. deformation of the ball
B. sound energy
C. heat energy
D all answers are true
A deformation of the ball
I believe sorry if I'm wrong
A sample of 2 moles of an ideal diatomic gas experiences a temperature increase of 60 K at constant volume. (a) Find the increase in internal energy if only translational and rotational motions are possible. 8.73 103 J (b) Find the increase in internal energy if translational, rotational, and vibrational motions are possible. 0.01222 (c) What fraction of the energy calculated in (b) is translational kinetic energy?
Answer:
A. To find increase in internal energy
We use
CV= f/2* R
=20.77J/molK
So change in internal energy is
nCvdt
So substituting
= 2 x 20.77x 60K
= 2493J
B.
We know that molar specific heat increase by R/2
So CV= (f/2+1)R
Which is 29.1J/milk
So
Increase in internal energy will be
nCvdt
= 2* 29.1*60
= 3490.2J
C. the translational energy is 3/2R
And the total molar specific heat capacity is 7/2R
So the fraction of energy in b due to K.E will be
3/7 * 3490.2
=1495.8J
in a hyrdo electic power plant the moving water turns the turbine creating ____________ energy.
Answer:
....................
Explanation:
................
Answer:
Mechanical Energy
Explanation:
Mechanical energy is energy possessed by motion. A hydroelectric power plant creates energy by motion.
A wedge is a double inclined plane. why?
Answer:
A wedge is a double inclined plane. ... When a wedge is moved, it applies force on an object. It applies an output force greater than your input force. In the case of an axe, the output force is so great that it causes wood to split.
Which statement describes all chemical changes, but not all physical changes?
1.bubbles are produced
2.A new substance forms.
3.phase changes occur
4.a color change occurs
2. A new substance forms
Chemical changes change composition, physical never do.
Hope This Helps, Good Luck!
Answer:
2: A new substances forms
Explanation:
Black object are good at?
Explanation:
Absorbing heat from the sun rather than reflecting.
Assume that before separation, the weight of the milk bottle's contents (mixed milk and cream) is wmix. How does the combined weight of the milk and cream after separation, wsep, compare to wmix
Answer:
Wsep = Wmix
Explanation:
When Cream and milk up in a bottle they might appear homogeneous but after the bottle must have settled down for a while i.e kept in a position without shaking the bottle. the contents ( cream and milk ) will be separated. this is because Milk and cream do not mix up just like some other liquids that don't mix-up. Wmix represents the weight of the bottle before separation while Wsep represents the weight after separation. but since both liquids are in the same bottle the weight after separation would remain the same
Wsep = Wmix
The bottle contents have separated. Now compute , the gauge pressure on the bottom of the milk bottle after the milk and cream have separated
When Cream and milk up in a bottle they might appear homogeneous but after the bottle must have settled bottle for a while i.e kept in a position without shaking the bottle. the contents ( cream and milk ) will be separated. this is because Milk and cream do not mix up just like some other liquids that don't mix-up. Wmix represents the weight of the bottle before separation while Wsep represents the weight after separation. but since both liquids are in the same bottle the weight after separation would remain the same.
learn more about milk bottle
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A ball is dropped from a height of 100 meters. How long will it take to hit the ground? Show work
20.4081/s^2
Explanation:
ignoring air resistance and with the knowledge that the acceleration of gravity is 9.8 we can use that to find the answer.
The formula is (hX2)/(9.8m/s^2)
so
100mX2 = 200m
200m/9.8m/s^2 = 20.4081/s^2
A hummingbird, flapping its wings to stay above a flower. Is an example of which newtons law?
Answer:
newtons 2nd law i think
Explanation:
Which of the following is a helpful process in evaluating scientific claims? (2 points)
A.quoting statistics
B. Making Lists
C. Biased thinking
D. Critical thinking
Answer:
I think D. Critical thinking is the answer
Select all the correct answers. In most cases, what happens to a liquid when it cools? Its density increases. Its density decreases. Its mass increases. Its mass decreases. Its volume increases. Its volume decreases.
Answer:
its density decrease
Explanation:
Explanation: As the molecules of a liquid are cooled they slow down. As the molecules slow down they take up less volume. Taking up less room because of the molecules lower energy causes the liquid to contract.
Answer:
A & F
Explanation:
As the liquid cools down, it means the temperature decreases the density of the liquid increases in most o the cases.
Now the volume is inversely proportional to the density of substance so density increases.
HELP ME PLEASE !!!!!!!!!!!!!!!!!
Answer:
Option D. 6.1 m/s²
Explanation:
We'll begin by calculating the acceleration due to gravity in each case. This is illustrated below:
1. For Rock:
Mass (m) = 20 g
Force (F) = 0.1224 N
Acceleration due to gravity (g) =?
Next, we shall convert 20 g to kg. This can be obtained as follow:
1000 g = 1 kg
Therefore,
20 g = 20/1000
20 g = 0.02 kg
Finally, we shall determine the acceleration due to gravity as follow:
Force of gravity (F) = mass (m) x Acceleration due to gravity (g)
F = mg
Mass (m) = 0.02 kg
Force (F) = 0.1224 N
Acceleration due to gravity (g) =?
F = mg
0.1224 = 0.02 × g
Divide both side by 0.02
g = 0.1224/0.02
g = 6.12 m/s²
2. For Grain of sand:
Mass (m) = 0.8 g
Force (F) = 0.00501 N
Acceleration due to gravity (g) =?
Next, we shall convert 0.8 g to kg. This can be obtained as follow:
1000 g = 1 kg
Therefore,
0.8 g = 0.8/1000
0.8 g = 0.0008 kg
Finally, we shall determine the acceleration due to gravity as follow:
Force of gravity (F) = mass (m) x Acceleration due to gravity (g)
F = mg
Mass (m) = 0.0008 kg
Force (F) = 0.00501 N
Acceleration due to gravity (g) =?
F = mg
0.00501 = 0.0008 × g
Divide both side by 0.0008
g = 0.00501/0.0008
g = 6.26 m/s²
3. For Metal bolt:
Mass (m) = 79 g
Force (F) = 0.4871 N
Acceleration due to gravity (g) =?
Next, we shall convert 79 g to kg. This can be obtained as follow:
1000 g = 1 kg
Therefore,
79 g = 79/1000
79 g = 0.079kg
Finally, we shall determine the acceleration due to gravity as follow:
Force of gravity (F) = mass (m) x Acceleration due to gravity (g)
F = mg
Mass (m) = 0.079 kg
Force (F) = 0.4871 N
Acceleration due to gravity (g) =?
F = mg
0.4871 = 0.079 × g
Divide both side by 0.079
g = 0.4871/0.079
g = 6.17 m/s²
From the above calculation we obtained the following values for acceleration due to gravity (g):
Object >>>> Acceleration due to gravity
Rock >>>>> 6.12 m/s²
Sand >>>>> 6.26 m/s²
Metal >>>>> 6.17 m/s²
Thus, closest approximation of the acceleration due to gravity of the planet is 6.1 m/s²
A ball rolled at a velocity of 12 m/sec. After 36 seconds, it comes to a stop. What is the acceleration of the ball? Round to the nearest tenth.
Solving the problem mathematically,
Initial velocity of the ball 12m/s
Final velocity 0m/s
Travel time 36s
Assuming the velocity follows a straight line, then the slope of the curve is equal to the rate of change of velocity (acceleration)
ie taninv(dv/dt) since it is linear taninv(12/33)= 0.33 m/s^2 deceleration.
If in case the velocity doesn’t follow the linear path acceleration= d(velocity profile)/dt. ie the first order differentiation of velocity is the acceleration.
You are driving at 40 miles per hour and you speed up to 60 miles per hour over the course of 20 miles. How long were
you driving for?
Target:
Solution: (Isolate, plugin, answer, units)
Knowns/Givens:
Equation:
Answer:
120 hours
Explanation:
a second class lever needs less effort to lift a heavy load.why give reason
Answer:second class lever needs less force to lift a load
Explanation: because the load is between the fulcrum/pivot point and the force. The fulcrum is far away from the force