answer:
change in momentum = 37,500kg.m/s in the opposite direction
time it takes = 12.5s
working:
u=25m/s
v=0m/s
F=ma
-3000=(1500)(a)
-3000÷1500=a
a= -2m/s^2
Change in momentum=mv-mu
(1500)(0)-(1500)(25)
= -37,500kg.m/s
relax the( - ) represents direction
v=u-at
0=25-2t
2t=25
t= 12.5s
A sound wave ________ and ______ the air molecules around your ear.
Group of answer choices
moves and shakes
compresses, expands
vibrates and heats up
Answer:
compresses and expands
Answer:
compreses and expands
Explanation:
because it is
Find the magnitude and direction of the net gravitational force on mass A due to masses B and
C in the figure. Each mass is 2 kg.
a. 2.8x10^-8N, to the right
b. 2.54x10^-8N, to the right
c. 3.4x10^-8N, to the left
d. 3.4x10^-8N, to the right
Answer is A 2.8 x 10^-8 N, to the right
The net gravitational force on mass A due to masses B and C is required.
The correct option is a. [tex]2.8\times 10^{-8}\ \text{N}[/tex] to the right.
G = Gravitational constant = [tex]6.674\times 10^{-11}\ \text{Nm}^2/\text{kg}^2[/tex]
[tex]r_{AB}[/tex] = Distance between A and B = 0.4+0.1 = 0.5 m
[tex]r_{AC}[/tex] = Distance between A and C = 0.1 m
[tex]m_A=m_B=m_c[/tex] = Mass of each particle = 2 kg
The required force is
[tex]F_A=F_{AB}+F_{AC}\\ =\dfrac{Gm_Am_B}{r_{AB}^2}+\dfrac{Gm_Am_C}{r_{AC}^2}\\ =Gm^2\left(\dfrac{1}{r_{AB}^2}+\dfrac{1}{r_{AC}^2}\right)\\ =6.674\times 10^{-11}\times 2^2\left(\dfrac{1}{0.5^2}+\dfrac{1}{0.1^2}\right)\\ =2.8\times 10^{-8}\ \text{N}[/tex]
The magnitude of force will be [tex]2.8\times 10^{-8}\ \text{N}[/tex]
The direction will be towards the right since C is closer to A.
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In which states of matter can an object change both volume and shape?
A. Gas and plasma
B. Gas and liquid
C. Liquid and plasma
D. Liquid and solid
Answer:
I believe it would be B.
Explanation:
When a object is in a gas or liquid form then take whatever the form of the container they are in is. Meaning they can change their volume depending on the container. Also a characteristic of gas and liquid is to take the shape of the container. This may be wrong but this is what I would choose
Answer: A is actually the correct answer. The guy who said B is wrong
Explanation: Gas and plasma both have Changing shape and changing volume
A roller coaster has a mass of 300 kg. It drops from rest at the top of a hill that's 101 m tall. How fast is it going when it reaches the bottom? Acceleration due to gravity is g = 9.8 m/s2 .
Answer choices:
A. 41.2 m/s
B. 21.8 m/s
c. 44.5 m/s
D. 76.7 m/s
A mortar shell is accidentally shot straight up with an initial speed of 147 m/s. How long does it take for the shell to reach its maximum height? How high does the shell rise? If the shell falls straight down after is stops, what is its velocity when it hits the ground? What is the total time the shell is in the air?
Answer:
1) t ≈ 14.985 seconds
2) The maximum height reached ≈ 1101.4 meters
3) The velocity with which it hits the ground = 147 m/s
4) The total time in the air ≈ 29.969 seconds
Explanation:
1) The given information are;
The initial velocity of the mortar shell = 147 m/s
The direction of the mortar shell = Vertically upwards
Therefore, we have, from the equation of motion
v = u - g·t
Where;
v = The final velocity = 0 at maximum height
u = The initial velocity = 147 m/s
g = The acceleration due to gravity = 9.81 m/s²
Therefore, we have;
0 = 147 - 9.81 × t
9.81 × t = 147
t = 147/9.81 ≈ 14.985 seconds
t ≈ 14.985 seconds
2) From the equation of motion, v² = u² - 2×g×s
Where;
s = The maximum height reached
We have;
0² = 147² - 2×9.81×s
2×9.81×s = 147²
s = 147²/(2×9.81) ≈ 1101.4 meters
The maximum height reached ≈ 1101.4 meters
3) The velocity with which it hits the ground is equal to the initial velocity = 147 m/s
4) The total time in the air = 2 × The time it takes to reach maximum height
The total time in the air = 2 × 14.985 ≈ 29.969 seconds
The total time in the air ≈ 29.969 seconds
Please i just need help
Answer:
D
Explanation:
it's the only negative one
Answer:
letter C.
Explanation:
I need help lease. I will mark you brainliest
Answer: 43.5
and now I'm typing cause it said the answer had to be at least 20 characters
Help! I'm in a pinch and need help!!! WILL BRAINLIEST! I am SUper BaD at this SUbJect.
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What does the weight of an object depend on?
A. Time taken for an event to occur
B. Temperature of the object
C. Force of gravity
D. Atmospheric pressure
Answer:
The Answer is C. The force of gravity
Explanation:
This is because it is the force of gravity exerted or inflicted upon the object or organism. With more gravity inflicting upon an object the heavier it feels. In fact, weight and gravity have such a close relationship that the equation for weight is F = M x A where F represents the objects weight in Newtons, M equals it's mass, and A represents the downward acceleration due to the gravity.
Answer:
The answer is c
Explanation:
What is the average speed of the boat between 4 and 6 minutes?
Answer:
[tex] the \: average \: speed \: of \: the \: boat \: between \: 4 \: and \: 6 \: \\ minutes \: = \frac{1000 - 500}{6 - 4} = \frac{500}{2} = 250[/tex]
note: cant really see the measuring units for clear unit for the value, however the average speed is 250 meter/mins, from observation.
A machine produces a larger force than you exert to operate the machine. How does this input distance of the machine compare to its output distance?
Answer:
Because the output force is greater than the input force, the input distance must be greater than the output distance.
Explanation:
If John mows 11.5 meters of lawn from east
to west in 7.1 seconds, what is the velocity
of the lawnmower?
A. 0.6 m/s East
B. 0.6 m/s West
C. 1.6 m/s East
D. 1.6 m/s West
this is due by 11.00 pm send some help pls!!!!
Your science teacher presents you with a circuit model that contains five light bulbs, a switch, and a 1.5-volt battery. The wires of the circuit are hidden from your view so that you cannot see how the bulbs are connected to the battery. How could you determine the type of circuit used in this model?
A.
If all the bulbs are equal brightness, it is a series circuit because each bulb in a series circuit has the same resistance.
B.
If all the bulbs are equal brightness, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery.
C.
If you unscrew one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery.
D.
If you unscrew one bulb and all the others stay lit, it is a series circuit because each bulb in a series circuit have to share the same current.
Answer:
C
Explanation:
PLACING BULBS IN SERIES
Increasing the number of bulbs decreases the brightness of the bulbs.
The resistance increases. In a series circuit, adding bulbs increases the resistance in the circuit. A complete circuit requires the electrons to move from the negative terminal of the battery to the positive terminal. When one bulb is unscrewed it opens the circuit preventing a complete circuit and the electrons cannot return to the battery.
PLACING BULBS IN PARALLEL
Two bulbs in parallel are brighter than two bulbs in series. In a parallel circuit each bulb is in its own circuit. As bulbs are added the resistance in the circuit decreases since each circuit is another pathway for electrons to move from one end of the circuit to the other.
If you unscrew one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery.
What is bulbs in series combination?The brightness of the bulbs reduces as the number of bulbs increases in series. Resistance rises in intensity. Adding bulbs to a series circuit raises the circuit resistance. The electrons must pass from the battery's negative to positive terminals in order for the circuit to be complete. When one bulb is removed, the circuit is broken, making it impossible for the electrons to return to the battery.
What is bulbs in parallel combination?In comparison to two bulbs in series, two bulbs in parallel are brighter. Each bulb is in its own circuit when the circuits are parallel. As more bulbs are added, the resistance in the circuit reduces because each additional circuit provides an additional route for electrons to travel from one end to the other.
You can determine the type of circuit used in this model by unscrewing one bulb and all the others stay lit, it is a parallel circuit because each bulb in a parallel circuit has its own path to the battery. Hence, option(C) is correct.
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A movie director creates a scene in which people on Spaceship #1 can see approach of Spaceship #2 and hear its engines. The director
hires a scientist to review the scene.
What should the scientist tell the director?
A .The scene needs no changes because light and sound waves can both travel through space.
B. The scene needs changes because neither light waves nor sound waves can travel through space.
C. The scene needs changes because sound waves can travel through space, but light waves cannot.
D. The scene needs changes because light waves can travel through space, but sound waves cannot.
A,B,C or D plz answer !
Answer:
It is D.
Explanation:
Sound travels by the movement of particles bumping against each other and if there is no particles in a vacuum(space) then there is no sound. Light can travel through space because it doesn't need to travel by/through particles.
how do I make a baby come out of a pickle?
Answer:
free free free free free free free free free free free free free free free free free points
Which chemical bond has a low melting point? Why does this bond have low melting points? A common compound that this bond produces is used in our everyday life. SUGAR!
Answer:
1,2: When simple molecular substances melt or boil, it is these weak intermolecular forces that are overcome. The covalent bonds are not broken. Relative little energy is needed to overcome the intermolecular forces, so simple molecular substances have a low melting and boiling points.
3: Water, Almost no living thing can survive without water. Water is everywhere on our planet. It is the reason we have an organic life on earth. A water molecule consists of one oxygen atom combined with two hydrogen atoms. We use water throughout day and night; in drinking, cooking, household needs, industries, and agriculture. Apart from these general uses of water, you might be amazed to know that water plays a major role in volcanic eruptions.
Within only a few seconds, Ana determines that she does not wish to be at this fraternity party and makes a hasty exit back
to her dorm. Which of the following was responsible for Ana's immediate, intuitive reactions to this "frat party"?
a. left brain
b. reflex arc
C. cognitive unconscious
d. righ brain
Answer:
left brain the left brain is your rapid more irrisponsibe side while your right cortex thinks about the potential outcomes
least massive metalloid of period 4
Answer:
It is Germanium(Ge)
Explanation:
IF RONALD CAN TAKE 2 GOLIATH DILD0S HOW MANY CAN TONY TAKE
USING THE PYTHAGOREAN THEOREM
Answer:
69
Explanation:
Calculate the work done by the cyclist when his power output is 200 W for 1800 seconds.
Answer:
3.6 × 10^5 J
Explanation:
Work Done = Energy
Energy = Power × time
Energy = 200 × 1800
= 360000 J
W =
[tex]3.6 \times 10 {}^{5} j[/tex]
How are mass and acceleration related (if you change one of them, what happens to the other one)?
A train leaves the station at the 0.0m marker traveling with a constant velocity of 45.0 m/s. How many
seconds later will the train pass the 1500.Om marker? What is the velocity of the train in km/h?
Answer:
119.88 km/h
Explanation:
1500/45=33.3
use a m/s to km/h calculator
put in 33.3 for m/s and you will get 119.88 km/h.
119.88 km/h.
Answer:
33.3 s
162 km/h
Explanation:
Given:
Δx = 1500.0 m
v₀ = 45.0 m/s
a = 0 m/s²
Find: t
Δx = v₀ t + ½ at²
1500.0 m = (45.0 m/s) t + ½ (0 m/s²) t²
t = 33.3 s
Convert m/s to km/h:
45.0 m/s × (1 km / 1000 m) × (3600 s / 1 hr) = 162 km/h
if an element forms a 2+ ion , in which group of the periodic table would you expect to find it ?
A. 17
B. 1
C. 18
D. 2
Answer: D
Explanation:
A population of lobsters was recently exposed to a new disease. Which type of limiting factor is this disease and what will be its predicted impact on the carrying capacity of this population? Group of answer choices density independent; the carrying capacity will increase density dependent; the carrying capacity will decrease density dependent; the carrying capacity will increase density independent; the carrying capacity will be reduced
Answer:
the carrying capacity will decrease density dependent
Explanation:
The limiting factor of the disease is density dependent and will decrease the carrying capacity of the population because the disease that affect the population operate when the number of organisms in per unit area get to a specific level , it's affected the population when the population per unit are reached a certain level and the disease decrease the carrying capacity of the population. Carrying capacity is the average population size of organisms in an habitat. As the lobsters population is affected by disease, the population sizes reduced because many of the lobsters would of died and inactive, thereby causing a reduction in the size and capacity.
A dolphin can swim at a constant speed of 12.5 m/s. How
long does it take a dolphin to swim 45 meters?
Answer:
[tex]\boxed {\tt 3.6 \ seconds}[/tex]
Explanation:
Time can be found by dividing the distance by the speed.
[tex]t=\frac{d}{s}[/tex]
The distance is 45 meters and the speed is 12.5 meters per second.
[tex]d= 45 \ m \\s= 12.5 \ m/s[/tex]
[tex]t=\frac{45 \ m}{12.5 \ m/s}[/tex]
Divide. Note that the meters, or "m" will cancel each other out.
[tex]t=\frac{45 }{12.5 \ s}[/tex]
[tex]t=3.6 \ s[/tex]
It will take the dolphin 3.6 seconds to swim a distance of 45 meters are 12.5 meters per second.
Answer:3.6 seconds
Explanation: 45/12.5 m/s is 3.6s
Erosion is the process by which soil and sediments are moved by gravity, wind, and water. Erosion occurs naturally, but it can be accelerated by human activity. Which of these human activities most contributes to soil erosion?
biking on forest trails
boating on a lake
cutting down trees
fertilizing a lawn
Answer:
Cutting down trees
Explanation:
The roots of trees often hold settiments in place, thus removing these strong natural barriers makes it easier for erosion to occur.
What is the process called when heat is added to a liquid? What does the liquid become?
Answer:
evaporation
Explanation:
when the liquid is heated it evaporates until it becomes air
what is quantum physics and what is the equation for space time and travel?
Answer:
Im not smart
Explanation:
but im your bff
Answer:
it explain how everythings work you should work with the speed of light multiply with the distance of the equator
The store where you work receives a shipment of stuffed animals. One box contains 48 teddy bears, and the other box has 32 stuffed dogs. Your job is to display the animals on shelves. You want to display them in rows of equal size, but you don't want to mix the teddy bears and the dogs. Use the drop-down menu to complete the statement. The greatest number of stuffed animals you can have in a row is
Answer:
16
Explanation:
The store where you work receives a shipment of stuffed animals. One box contains 48 teddy bears, and the other box has 32 stuffed dogs.
We find the factors of 32 and 48
The factors of 32 are: 1, 2, 4, 8, 16, 32
The factors of 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
The greatest common factor is 16.
Hence,
The greatest number of stuffed animals you can have in a row is 16
A heavy log will float on water
because:
A. It is less dense than water
B. It weighs less than water
C. It is more dense than water
D. It weighs more than water
Answer:
A it is less dense than water
Explanation:
The density, of a substance is its mass per unit volume
why do people have a virgna
Answer: For many things, like reproduction and releasing bad bacteria.
Explanation: We all have our parts, but what’s most important is our private parts. It helps us to use the restroom, and release the bad bacteria, without it, we’d die from holding it in! But also, it helps the world grow, because to reproduce we need those parts.