Answer:
I believe that it's True.
A boat that moves with a constant velocity of 12 m/s is moving on a river with a
constant current of 4 m/s. What is the resultant velocity of the boat if:
a) The boat is traveling to the north and the current is to the south?
b) The boat is traveling to the south and the current is to the south?
c) The boat travels to the east, across the current, while the current is to the south.
Explanation:
Given that,
Velocity of boat, [tex]v_b=12\ m/s[/tex]
Velocity of current, [tex]v_c=4\ m/s[/tex]
(a) If the boat is traveling to the north and the current is to the south,
[tex]v_b=12j\ m/s[/tex]
[tex]v_c=-4j\ m/s[/tex]
The resultant velocity,
[tex]v_r=12-(4)=8\ m/s[/tex] due North
(b) If boat is traveling to the south and the current is to the south,
[tex]v_b=-12j\ m/s[/tex]
[tex]v_c=-4j\ m/s[/tex]
Resultant velocity,
[tex]v_r=12+4=16\ m/s[/tex] due south
(c) If the boat travels to the east, across the current, while the current is to the south.
So,
[tex]v_r=\sqrt{12^2+4^2}\\ \\v_r=12.64\ m/s[/tex]
an electric heater takes 4 A when operated on 250 V supply. calculate the cost of the electricity consumed at 10k per kWh when the heater is used for 4 hours
Answer:
P=IV.
P=4×250=1000.
(1000/1000)kw×4.
1×4=4×10=40k.
we do not use water instead of mercury in a barometer
Answer:
Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure.
A small metal sphere has a mass of 0.19 gg and a charge of -23.0 nCnC. It is 10.0 cmcm directly above an identical sphere that has the same charge. This lower sphere is fixed and cannot move. If the upper sphere is released, it will begin to fall.What is the magnitude of its initial acceleration?
Answer:
a = -7.29 m / s²
Explanation:
For this exercise we must use Newton's second law,
F -W = m a
Force is electrical force
F = k q₁ q₂ / r²
k q₁ q₂ / r² -mg = m a
indicate that the charge of the two spheres is equal
q₁ = q₂ = q
a = (k q² / r² - m g) / m
a = k q² / m r² - g
Let's reduce the magnitudes to the SI system
m = 0.19 g (1kg / 1000 g) = 1.9 10⁻⁴ kg
q1 = q2 = q = -23.0 nC (1C / 10⁹ nC) = -23.0 10⁻⁹ C
r = 10.0 cm (1m / 100cm) = 0.1000 m
let's calculate
a = 9 10⁹ (23.0 10⁻⁹)² / (0.1000² 1.9 10⁻⁴) - 9.8
a = -7.29 m / s²
The negative sign indicates that the direction of this acceleration is downward
An ant can travel approximately 30 meters per minute. How many meters could an ant move in 45 minutes.
Answer:
From what I see, it's saying that every minute, the ant can move 30 meters. So how many meter would it move in 45 minutes?
30 meters = 1 min
x meters = 45 min
1 min x 45 = 45 min
30 meters x 45 = 1,350 meters
So, I believe the answer would be 1,350 meters.
hope this helps. :>
who is the winner of khatron khiladi made in india 2020
Answer:
karishma tanna
Explanation:
it is correct
Karishma Tanna was declared as the winner.
HELP PLZ "25 meters per second Northeast" is a description of
Speed
Acceleration
Velocity
Direction
Answer:
ion no
Explanation:
cuz i dont
Answer:
It is the SPEED of an object.
Explanation:
What is the following correct way to write 2,330,000 In a scientific notation
Answer:
2.33 × 10^6
hope this helps.
Answer:
2.33 x 106
Explanation:
it is right promise
john can travel to atlanta 560 miles in 9 hours what is his velocity
Answer:
132
Explanation:
Experiment Question: How does temperature affect the air (gas) inside a balloon? Please help it's just the hypothesis I need help in. Also, this is NOT physics, it's SCIENCE!! (I couldn't find science, but yeah)
Answer:
I think when the balloon is heated up the gas will expand making the balloon bigger. When things are heated up the molecules will get excited and expand. When they balloon is cooled then the it will retract.
Hope this helps! :)
A boat sailed 7 hours at speed of 80km/h
Answer:
No it’s 1,130
Explanation:
I did online
How long does it take a car to cross a 20m bridge if it starts from rest and accelerates at 5 m/s^2?
2s
1.89s
1.41s
1.41 m
2.8s
The correct answer is 2.8s
i will give brainliest Which of the following structures are present in plant cells but absent in animal cells? Choose 1 answer: (Choice A) A Cell walls (Choice B) B Mitochondria (Choice C) C Cytosol (Choice D) D Golgi bodies
Answer:
A. cell walls
Explanation:
Plants have cell walls but animals dont.
A hummingbird beats it’s wings up and down 60 times a second what is the frequency and period
Answer:
Period = 0.0167 seconds
Frequency = 60 Hz
Explanation:
Period: This can be defined as the time take by a wave to complete on cycle. The S.I unit is (s)
Frequency: This is the number of cycle completed by a wave. The S.I unit is (Hz)
From the question,
T = t/n................................... Equation 1
Where T = period, t = time take to complete n oscillation, n = number of oscillation.
Given: t = 1 seconds, n = 60.
Substitute these values into equation 1
T = 1/60
T = 0.0167 seconds.
Also,
F = 1/T........................... Equation 2
Where F = frequency
Given: T = 0.0167 seconds,
Substitute these value into equation 2
F = 1/0.0167
F = 60 Hz
Explain why lenses are used for particular applications. ( please write a long detailed answer )
Answer:
Lenses are very important for us. Without lenses even we can't imagine the world. Without lenses our life is like life without colors.
Explanation:
Lenses are used everywhere around us in car, truck, glass, headlamps etc. It is also present in the flashlight of the LED light that is used in electronic materials.
Our eyes have also most amazing lenses. When you look at ground, at sky, and staring at moon all that happen that because of our binocular lenses. Our eyes have two type of lenses that concave lenses and convex lenses.
By these lenses we can see far and near object6s easily. Thus we used special applications of lenses to see the objects.
Pls help
Qn 9,10,11
Qn 11
Answers,
a) 10g/cm3
b) 20g/cm3
c) 30g/cm3
d) 40g/cm3
Answer:
Q no. 9: a
Q no. 10: d
Q no. 11: b
Lee is traveling in a train moving at a constant velocity of 35 m/s to the east. If Lee is seated on the train and staring at the seat directly in front of him, how fast does the seat in front of Lee appear to be moving relative to Lee?
Answer:
0 m/s or stationary
The seat in front of Lee appear to be at rest
Explanation:
When the motion of a person or object is found by comparing the person or objects motion with regards to a stationary object or an object in motion, the result is the relative motion of the person or object to the stationary or moving object
In the question, Lee is comparing the motion of the chair in front of him with regards to the motion of the chair he his sitting on.
The speed of both chairs are the same as the speed of the train in which they are attached.
Therefore, as the seats are fixed relative to each other such that there is no change in their relative position and therefore, no or 0 m/s relative velocity with each other.
A scientist is trying to identify an unknown cell. He determines that it has a nucleus and lysosomes.
It also contains a cell membrane, but does not have a cell wall. What type of cell is the scientist most likely looking at?
Choose 1 answer:
(Choice A) A Animal cell
(Choice B) B Fungal cell
(Choice C) C Plant cell
(Choice D) D Bacteria
Answer:
Choice A) A Animal cell
Explanation:
Answer:
A.
Explanation:
which of the following substances is a base? ammonia, distilled water, lemon juice, or vinegar
Question 3 (1 point)
Which of the following is a vector quantity?
a) 16.5 seconds
b) 18.5 m/s west
c) 25 m/s
d) 12 meters
Answer:
B) 18.5 m/
s west
Explanation:
Scalar quantity has MAGNITUDE only
Vector quantity has MAGNITUDE and DIRECTION
Hope this is correct and helpful
HAVE A GOOD DAY!
The model below shows a calcium atom. An image has a mix of red and blue balls in its center and 4 concentric black rings around the center. The first ring from the center has 2 small green balls on it. The second ring has 8 small green balls on it. The third ring has 8 small green balls on it. The outermost ring has 2 small green balls on it. How many electrons are in the third energy level?
Answer:
8 electrons in the third energy level
Explanation:
From the description,the third energy level has 8 electron (represented by the small green balls you describe)
Answer:
8
Explanation:
I gotcha fam
An object with a density of 0.85 g/cc is dropped into each of the two beakers shown below. Beaker 1 has a density of 0.5 g/cc. Beaker 2 has a density of 1 g/cc. What will happen to the object in each case?
Answer:
The object will sink in the liquid in beaker 1.
The object will float in the liquid in beaker 2
Explanation:
The density of an object relative to the density of a fluid determines if the object floats or sink in a fluid. The density of a material is the measure of the amount of mass of that material packed into a unit volume of that material.
For the beaker 1, the liquid in this beaker has a density of 0.5 g/cc, which is lesser than the density of the object (0.85 g/cc). This means that the object will add more mass than there should be to the volume of the space it displaces within the field. This results in the object sinking in the fluid.
For beaker 2, the liquid in this beaker has a density of 1 g/cc, which is more than the density of the object (0.85 g/cc). This means that the object will add less mass than there should be to the volume of the space it displaces within the field. This results in the object floating in the fluid.
3. A bus accelerates at 25 m/s/s. This allows the bus to speed up from 16 m/s to 172 m/s. How long
did this take?
9.18 seconds
-9.18 seconds
-6.24 seconds
6.24 seconds
Answer:
time taken will be 6.24sec.
please follow me
In descriptive scientific investigations, scientists often make observations to understand the interacting parts of a complex .
Answer:
system
Explanation:
I js took the test
Under what circumstances does distance traveled equal magnitude of displacement? What is the only case in which magnitude of displacement and distance are exactly the same?
Answer: Please find the answer in the explanation
Explanation:
Under what circumstances does distance traveled equal magnitude of displacement?
When a body's motion is linear in one direction. Or a body moving in a straight line without turning back.
What is the only case in which magnitude of displacement and distance are exactly the same?
When the body is moving in a straight line with without changing direction or without turning back.
A football coach walks 18 meters westward, then 12 meters
eastward, then 28 meters westward, and finally 14 meters
eastward.
Answer:
Displacement = 20
Direction = westward
Explanation:
Given that a football coach walks 18 meters westward, then 12 meterseastward, then 28 meters westward, and finally 14 meters
eastward.
To calculate the displacement,
Let eastward = negative
Westward = positive
Displacement = 18 - 12 + 28 - 14
Displacement = 46 - 26
displacement = 20 metre
Since the answer is positive, the direction is westward.
Which of the following element has seven total valence electrons? Your answer: argon helium oxygen bromine
Answer:
bromine
Explanation:
Any element in the halogen group will have seven valence electrons. These elements include fluorine, chlorine, bromine, iodine, and astatine
A person holding a lunch bag is moving upward in a hot air balloon at a constant speed of 7.7 m/s . When the balloon is 21 m above the ground, she accidentally releases the bag. Part A What is the speed of the bag just before it reaches the ground
Answer:
The speed of the bag just before it reaches the ground is 21.71 m/s.
Explanation:
The speed of the bag can be found using the following equation:
[tex] v_{f}^{2} = v_{0}^{2} - 2gy [/tex]
Where:
[tex]v_{f}[/tex] is the final speed =?
[tex]v_{0}[/tex] is the initial speed = 7.7 m/s
g: is the gravity = 9.81 m/s²
y: is the height = 21 m
[tex]v_{f}^{2} = v_{0}^{2} - 2gy = (7.7 m/s)^{2} - 2*9.81 m/s^{2}*(-21 m) = 471.31 m^{2}/s^{2}[/tex]
[tex]v_{f} = 21.71 m/s[/tex]
Therefore, the speed of the bag just before it reaches the ground is 21.71 m/s.
I hope it helps you!
NET FORCE ( PLEASE ANSWER ASAP )
First picture (black background): 50 Newtons UP
Second picture (white background): 30 Newtons RIGHT
A freely suspended magnet does not point exactly at the geographical N-S direction