Answer:
275
Explanation:425- 150 =275mlml=gm
True or false: If the net external force on a system is zero, then the momentum of a system is constant even if objects in the system collide and exert forces on one another.
Answer:
True: if no external forces act on a system of objects then the total momentum of the system is unchanged.
It is true that if the net external force on a system is zero, then the momentum of a system is constant even if objects in the system collide and exert forces on one another.
What is momentum?Momentum is simply a quantity of motion. Quantity is measurable in this case because if an object is moving and has mass, it has momentum.
If an object does not move, it does not have momentum. However, it is important in everyday life, but many people are unaware of it.
According to the law of conservation of momentum, the momentum of a closed system is constant over time (conserved).
A closed (or isolated) system is one in which the mass remains constant and the net external force is equal to zero. Only when a system is closed does its total momentum become conserved.
Thus, the statement is true.
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A 30 cm scale has one end broken. The mark at the broken end is 2.6 cm. How would you use it to measure the length of your pencil
pls tell correct ans
Answer:
the mark of the broken end is 2.6 cm so, we use the scale from the next full mark i.e. 3cm
Explanation:
we now measure the length of the pencil by keeping the 3 cm mark of the scale at it's left end.
The 3 cm value is then subtracted from the scale reading at the right side end of the pencil to obtain the correct length of the pencil. ✏️
(i i ) place the scale in the contact with object along it's length
(2) Your eyes must be exactly in front of the point where the measurements to be taken.
Hope_it_helps_mga_ka_joiners_mwehehe
kinetic energy is _____ proportional to the ____ velocity
directly amount
directly square
directly cube
inversely square
Answer:
Kinetic energy is DIRECTLY PROPORTIONAL TO MASS AND VELOCITY
1. Every morning, from their house to the bus stop Raine has to walk 12 m west , 24 m North and 12m East in 80 s . a) What is the total distance travelled by Raine ? b) What is her average speed? c) What is the total displacement of Raine? d) What is her average velocity.
2. A bus travels on an interstate highway at an average speed of 85 km/h. How far does the bus travel in 1.5 hours?
3. A postman delivers a letter to a recipient who lives 24.0 km away from the post office. If it took the postman 0.50 h to reach the recipient's home, what is the speed of the postman?
Answer correctly pls i have no points left :(
Q1) [refer attached photo]
a) know that distance is the length between two points
so
the total distance travelled by Raine = 12m + 24m +12m
= 48m
b) Average speed is total distance travelled divided by total time taken by object.
= 48m / 80s
= 0.6 ms^-1
c) know that displacement is the shortest distance between two points.
total displacement = 24m
d) since we don't know about the velocities ( i.e initial and final ) average velocity can be found with displacement ( s ) divided by time interval ( t ) of the displacement.
avg. velocity = s/t
know that displacement is the shortest distance between two points.
displacement = 24m
average velocity = 24m/ 80s
= 0.3 ms^-1
Q2)
Average speed (85 km/h) is total distance travelled divided by total time taken (1.5 hours)
total distance = speed × time
= 85 × 1.5
= 127.5 km
Q3)
24km / 0.50h = 48km/h
A boat is traveling upstream at 14 km/h with respect to the water of a river. The water itself is flowing at 9 km/h with respect to the ground. What is the velocity of the boat with respect to the ground
Answer:
16.64 km/h
Explanation:
Think of the x and y components as the a and b sides of a triangle and simply do the Pythagorean Theorem:
[tex]a^2+b^2=c^2[/tex]
[tex]14^2+9^2=c^2[/tex]
[tex]\sqrt{196+81}=c[/tex]
[tex]\sqrt{277}=c[/tex]
[tex]16.64 km/h[/tex]
Three materials were rubbed with an insulating cloth and tested to determine their charge. The table shows the results. Which material could be a metal?
Answer:
When two materials are rubbed together, the material with the greatest affinity for electrons is the material which takes electrons away from the other material. Saran wrap takes electrons from nylon and acquires the negative charge. In turn, the nylon loses electrons and becomes charged positively.
I think it's right, HOPE IT HELPS AND BE SAFE :D
If the actual mass of a marble is 3.53 g, and you measured it to be 3.22 g, is your measurement accurate?
What is the speed of a 0.15-kg baseball whose kinetic
energy is 77 J?
Answer:
The speed is 15.5 m/s
The kinetic energy can be written as:K =
(1/2)*m*v^2
where m is the mass and v is the speed.
Then we have that:
18 j = (1/2)*0.15kg*v^2
Now we solve this for v.
✓(18*2/0.15) = v
15.5 m/s = v
Explanation:
I hope it will help you.....
When my phone is plugged into a 120 Volt outlet, it takes 20 minutes to fully charge it with 32kJ of energy.
How much current if flowing through the charging cord?
A) 0.13 Amps
B) 0.22 Amps
C) 0.33 Amps
D) 0.64 Amps
E) 13 Amps
F) 22 Amps
G) 33 Amps
H) 64 Amps
There is only one answer, please help!
The Current flowing in the charger is 0.22 Amps.
Energy consumed
The energy consumed by the phone is calculated using the following relationship.
E = IVt
where;
I is the current flowingV is the voltaget is the timeCurrent flowing in the chargerThe Current flowing in the charger is calculated as follows;
[tex]I = \frac{E}{Vt} \\\\I = \frac{32,000}{120 \times (20 \times 60 )} \\\\I = 0.22 \ Amps[/tex]
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Why do you put a voltmeter in parallel with a resistor in order to measure the change of electric potential energy?.
Answer:
A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. An ammeter is a measuring device used to measure the electric current in a circuit. A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.
Explanation:
Hope this helps:)
How many protons, neutrons, and electrons does a neutral atom of copper-65 have?
Answer:
An atom of Cu-63 has 34 neutrons and an atom of Cu-65 has 36 neutrons. 27- The total number of electrons in an atom of Cu-65 is 29 because copper has atomic number of 29, which simply means that an atom of copper has 29 protons and 29 electrons.
Explanation:
Answer:
Copper-65 has 36 neutrons, 29 electrons and 29 protons
Explanation:
Does sunlight make plants live
Answer:
yes!
Explanation:
What is the difference of Mitosis and Meiosis? Please explain it in easy way.
Answer:
The nuclear division processes of mitosis and meiosis occur during cell division. During mitosis, body cells are divided, while during meiosis, s3x cells are divided. At mitosis, a cell divides once; at meiosis, it divides twice.
Explanation:
How long does an object accelerating at minus,−6.7m/s 2 take to change velocity from ,26m/s to,0m/s?
vf² = vi² + 2.a.d
0 = 26 + 2.(-6.7).d
13.4d = 26
d = 1.94 m
The prefix "deka" is used to designate which power of ten?
21
9-
ОООО
6
1
Answer:
1 is the power of ten.
Explanation:
[tex]10^1[/tex] is deka.
Basically 10 is deka, same result as [tex]10^1[/tex].
Which one of the pictures below shows no work being done?
Select one:
a. The man trying to move the elephant.
b. The girl moving the wagon.
c. The same amount of work is being done.
d. Neither picture shows work being done.
Answer:
A
Explanation:
No motion, no work.
The formula is W = F * d. If d is 0 then the work is 0.
I misread the original question. The elephant is not going anywhere soon. The girl is moving.
So the answer is A
Answer:
Option A
The man trying to move the elephant.
Explanation:
In the given picture we can see that
“Man unable to move elephant”“A girl moving a wagon”We know that
Work done = Applied Force × DisplacementHere,
The girl is moving a wagon that means it displaces
So
W = F • d (distance be x)
W = Fx
Here, It shows work done
Now,
Man unable to move elephant that means it doesn't displaces, d = 0
So,
W = F • d (here d = 0)
W = F • 0
W = 0
Here, It shows no work done.
-TheUnknownScientist 72
13. If a 40,000g cannon ball is 35m above the Earth's surface, how much potential energy does the cannon
ball have?
Answer:
PE = 13734 Joules
Step-by-step explanation:
Formula: PE = m * g * h
Givens
m = 40000 grams
m = 40000 grams * 1kg/1000 grams = 40 kg
g = 9.81
h = 35 m
PE = 40 * 9.81 * 35
PE = 13734 Joules
What form does the signal take while it is broadcast from a transmitting station to your radio or television, regardless of whether it is a digital or analog wave? transverse longitudinal mechanical sound.
Answer:
transverse
Explanation:
Answer:
Transverse wave is the correct answer, the person above me is correct!
~Hope this helps! :)
FOR THOSE SMARTIES!!
calculate the total efficiency of a device that uses two components with efficiencies of 87% ans 64%.
a. 56%
b. 1.4%
c. 151%
Answer:
the answer is C on edu I got it right
A method of heat loss in which the layer of heated air next to the body is constantly being removed and replaced by cooler air is called
Answer:
forced convection cooling
Explanation:
A spherical glass ornament is 6 cm in diameter. If an object is placed 10.5 cm away from the ornament, where will its image form? What is the magnification?
The magnification is mathematically given as
M= 0.125
Lens magnificationQuestion Parameters:
A spherical glass ornament is 6 cm in diameter.
If an object is placed 10.5 cm away from the ornament, where will its image form
Generally, the mirror equation for ornament is mathematically given as\
1/q = 2 / r - 1/p
Therefore
1/q = 2 / (-3 cm) - 1/(10.5 cm)
q = -1.31 cm
Therefore, the magnification
M = -q/p
M= -(-1.31 m)/ (10.5 cm)
M= 0.125
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Please help me as quickly as possible.
Answer:
sorry no idea
Explanation:
I wish I could help
in your own words how does accomplish your goals influencing athletes?
Answer:
Goal setting can improve performance, influence motivation, and help athletes reach their potential. It can influence athletes by motivating them to work harder
Explanation:
What physical quantity describing motion does the driver neglect when he/she practices tailgating? [Choices: distance, displacement, speed, velocity or acceleration]
The physical quantity that is neglected when practicing tailgating is :
Distance TailgatingTailgating is the act of driving or following a vehicle very closely and this can be very dangerous as well, during this act the distance between the vehicles is been neglected by the driver.
Distance is the difference in position of an object with time in respect to another object. ( i.e It is a scalar quantity ).
Hence we can conclude that the physical quantity that is neglected when practicing tailgating is Distance.
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Which of the following is a correct
definition of the word "contingencies"?
Answer:
I already told ya
Explanation:
i got brainly so i could learn
What kinds of effects can humans have on food webs in ecosystems?
At what angle do the cars move after the collision?
Answer:
his results in the final angle after the collision of 37.2 degrees basically what we did there is turn the vector into a right triangle. We use sohcahtoa to solve for the angle. Being.
Explanation:
1) Calculate tension force in the string if the system accelerates up an inclined plane at 4m/s²
2) Calculate the magnitude of F if the system moves up the inclined plane at a constant velocity
1) As long as there is tension in the string connecting the two objects, they will both accelerate together with the same acceleration, 4 m/s². By Newton's second law,
• the net force on the 3-kg object acting parallel to the incline is
∑ F = F - T - f₃ - 3g sin(30°) = (3 kg) (4 m/s²)
• the net force on the 3-kg object perpendicular to the incline is
∑ F = n₃ - 3g cos(30°) = 0
• the net parallel force on the 6-kg object is
∑ F = T - f₆ - 6g sin(30°) = (6 kg) (4 m/s²)
• and the net perpendicular force on the 6-kg object is
∑ F = n₆ - 6g cos(30°) = 0
From the last two equations, it follows that
n₆ = 6g cos(30°) ≈ 50.9223 N
f₆ = 0.2 n₆ ≈ 10.1845 N
T - f₆ - 6g sin(30°) = 24 N ⇒ T ≈ 63.5845 N ≈ 64 N
2) If the objects are pulled up the incline with constant velocity, then the acceleration of either object is zero. The free body diagrams stay the same, so we have the same equations using Newton's second law, the only difference is that each right side is zero.
The new tension in the string is then
T - f₆ - 6g sin(30°) = 0 ⇒ T ≈ 39.5845 N
From the second equation above, we find
n₃ = 3g cos(30°) ≈ 25.4611 N
f₃ = 0.1 n₃ ≈ 2.5461 N
Then in the first equation,
F - T - f₃ - 3g sin(30°) = 0 ⇒ F ≈ 56.8306 N ≈ 57 N
Without the Moon, when would high tide happen every day?
Question 4 options:
midnight
3am
noon
3pm
high tide will appear on noon
The electricity received at an electrical substation has a potential difference of 20,000 V. What should the ratio of the turns of the step-down
transformer be to have an output of 500 V?
Help plzzz
The turn ratio of the transformer is 40.
What is a transformer?A transformer is an electrical device that is used to step up or step down voltage.
The formula for calculating the turns ratio of a transformer is given below.
Formulaa = V/v.......... Equation 1Where:
V = Primary voltagev = Secondary voltagea = Turns ratio of the transformerFrom the question,
Given:
V = 20000 Vv = 500 vSubstitute the values above into equation 1
a = 20000/500a = 40.Hence, The turn ratio of the transformer is 40.
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