Answer:
stationary object with no outside force will not move. With no outside forces, a moving object will not stop. An astronaut who has their screwdriver knocked into space will see the screwdriver continue on at the same speed and direction forever. There are no forces acting on the screwdriver from friction.
There are many factors that would affect how fast a bowling ball moves. Which of the two factors listed below is most important in determining the acceleration rate of a bowling ball? A direction and time B. mass and direction C. force and direction D force and mass
Clarisse had three substances. A white substance was waxy and malleable. A red crystal was translucent, and it cracked when she hit it with a hammer. A silver substance could be flatten by hitting it with a hammer, but it did not crack. Which two statements could be true?
Answer:
The red substance was ionic. The white substance was molecular.
Explanation:
B.C.
If Clarisse had three substances, A white substance was waxy and malleable. A red crystal was translucent, and it cracked when she hit it with a hammer. A silver substance could be flattened by hitting it with a hammer, but it did not crack. the two true statements are the red substance was ionic and the white substance was molecular. therefore the correct option is B and D.
What is a Chemical compound?The chemical compound is a combination of two or more either similar or dissimilar chemical elements, for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.
These chemical compounds are formed because of different types of bonds between the constituent's elements, the chemical bonds are mainly ionic bonds, covalent bonds,s, and hydrogen bonds.
Ionic bonds are formed due to the transfer of electrons between two bond-forming pairs differentiated by their electronegativity.
Covalent bonds are formed by the sharing of electrons. Generally, organic compounds are formed as the reason for covalent bonds.
As the white substance is waxy and malleable and the silvers substance could be flattened by hitting with a hammer but it did not crack it means the white substance is a metallic material that is molecular in nature , the red crystal is translucent and cracked when hit with a hammer this means it is ionic in nature.
Thus, the correct options are option B and option D.
Learn more about a chemical compound from here
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A sports car skids off of a wet mountain road at 48.5 m/s and lands in the river, 110
m below the road. How long will it take for the sports car to land in the river?
Answer:
about 4.74 seconds
Explanation:
The time to fall distance d from height h is given by ...
t = √(2d/g)
t = √(2·110 m/(9.8 m/s^2)) ≈ 4.74 s
It will take the car about 4.74 seconds to fall 110 meters to the river.
__
We assume the car's speed is horizontal, so does not add or subtract anything to/from the time to fall from the height.
The Mass of a Body
Decreases when accelerated
Decreases when accelerated
Increases when accelerated
None of these
Answer:
Acceleration does not affect mass. Acceleration only affects weight.
Explanation:
Your mass is the same on Earth compared to on the moon, but your weight is going to be different because the acceleration due to gravity is going to be different.
I need help asap :>
Answer:
[tex]\huge\boxed{\sf v = 0.75\ m / s}[/tex]
Explanation:
Given Data:
Wavelength = λ = 0.25 m
Frequency = f = 3 Hz
Required:
Speed = v = ?
Formula:
v = fλ
Solution:
v = (3)(0.25)
v = 0.75 m / sec
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807what is kepler-10b ?
Answer:
is the first confirmed terrestial planet to have been discovered outside the solar system by the kepler space telescope
Explanation:
Answer:
tumko hy matlab hai mera
I NEED ANSWERS ASAP! IM GIVING 100 POINTS!
1. When weather predictions are incorrect, what is the most likely cause?
A) The person predicting the weather may have had a bias.
B) Small differences in models can lead to large differences in complex systems.
C) The elevation of different landforms may have been significantly inaccurate.
D) Measurements of the initial conditions may have been very inaccurate.
2. If climate change gradually made some weather models less accurate at predicting weather, what could be done with those models? (1 point)
A) Meteorologists could just add or subtract a little at the end if they knew by how much the models were off.
B) Meteorologists could use more computing time to generate more precise calculations.
C) It would be best to start over from present observations and create a new weather model.
D) Small changes could be made to the models that would greatly improved their ability to predict the weather.
3. Weather reports are able to forecast the percent chance of precipitation, although it is generally much more reliable in the Midwest of the United States (Nebraska, Kansas), than in the Pacific Northwest (Washington, Oregon). What is the most likely cause for this? (1 point)
A) Mountains and bodies of water make models more complicated in the Pacific Northwest.
B) In parts of the country where it rains more often, it is just easier to predict that it may rain, and that is often correct.
C) Data collection is better in the Midwest, leading to better predictions.
D) There is a bias in different parts of the country about weather.
4. The most difficult models involve phenomena that change very quickly. Which of the following models would involve the most challenging set of computations? (1 point)
A) stellar evolution
B) tornado formation
C) climate change
D) plate tectonics
5. An astronomer has used a computational model to predict the effects of two galaxies colliding. What would be the best way to find evidence that the model is valid? (1 point)
A) Wait for two galaxies to collide and watch what happens.
B) Have another group perform an independent test of the same model.
C) Repeat the computations many times and get an average.
D) Look at different examples of galaxy collisions in the universe.
PLEASE HELP!!!
Answer:
1.b 2.d 3.b 4.a 5.c
Explanation:
I tried my very best and I hoped these helped
Answer:
1. B
2.D
3.C
4.B
5.D
Explanation:
i'm not sure if these are correct but hope this helps
With a pulley system, a force of only 50 lb can lift a 500-lb weight. What is the mechanical advantage if this system is 100% efficient
Answer:
the mechanical advantage is 10
Explanation:
The computation of the mechanical advantage is as follows:
Mechanical advantage is
= Load ÷ Effort
where,
The Loan is equivalent to the weight i.e. 500 lb
And, the effort is equivalent to the force applied i.e. 50lb
So, the mechanical advantage is
= 500 ÷ 50
= 10
Hence, the mechanical advantage is 10
1. How much work is done by a person if he lifts a load of 500 kg upto a height of 2m?
Explanation:
if we take g=9.8m/s^2
F=mg
m=500
F=500×9.8=4900N
h=2
so w=mgh
w=4900×2
=9800j
Yoga not only builds flexibility, but strength and balance.
True or False
Answer:
True
Explanation:
I just know.
How can the speed of ripples in a ripple tank be changed
Answer:
By putting something like a sheet of glass in the water.
Explanation:
Putting a sheet of glass in the water will make the ripples move slower because the speed of a wave depends on the depth of water.
which diseases are most likely to be treated with antibiotics?
a. those caused by viruses
b. those caused by fungi
c. those caused by parasites
d. those caused by bacteria
Answer:
c) those caused by parasites
Under which conditions are particles in a medium said to be in phase with one another?
A: when they have the same displacement from the equilibrium position and the same velocity
B:when they have the same frequency from equilibrium position and the same wavelength
Answer:
Corvette Corvette
Explanation:
teehee
The answer is A btw :)
When two particle have the same displacement from the equilibrium position and the same velocity, they are said to be in phase with one another.
What is phase?Phase is the location of a time point on a waveform's cycle. A phase is an dimensionless quantity. While two or more waveforms may have the same frequency, cycle, and wavelength, phase refers to how closely they are aligned.
Particles in a medium said to be in phase with one another when they have the same displacement from the equilibrium position and the same velocity. As frequency and wavelength is property of waves - not particles.
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Projectiles move in which two directions?
Analyzing two-dimensional projectile motion is done by breaking it into two motions: along the horizontal and vertical axes.
hope it helps!!
Answer:
up and down
Explanation:
this is because they do have the correct flagellum to move to the left and to the right
a car of mass 1500kg collides with a wall. the initial and final speed of the car is -15m/s and 2.6m/s. if the collision last for 0.15 seconds. find the impulse caused by the collision and the average force on the car
Answer:
See the answers below.
Explanation:
In order to solve this problem we must use the principle of conservation of momentum and the amount of movement. Where the car moves to the left with a negative speed sign while the force of the collision will be taken to the right.
[tex]-m_{car}*v_{car1}+(F*t)=m_{car}*v_{car2}[/tex]
where:
Vcar1 = velocity of the car before the collision = - 15 [m/s]
F = impact force [N]
Vcar2 = velocity of the car after the collision = 2.6 [m/s]
[tex]-(1500*15)+(F*t)=(2.6*1500)\\F*t=22500+3900\\F*t=26400[kg*m/s][/tex]
Where the product of force by Time is equal to the impulse caused by the collision.
[tex]And the force\\F = P/t\\F=26400/0.15\\F=176000[N][/tex]
Iron nail sinks in water while a ship made of iron-steel floats in it. Why ?
Answer:
because the density of iron nail is more tha n density of water but the density of ship made iron steel is less than the density of water
A jeep starts from rest. If its velocity becomes 72 km/hr in 4 seconds.
i. What is the acceleration of the jeep ?
[Ans: 5 m/s]
ii. What is the distance covered by jeep?
[Ans : 10 m]
Answer:
See the answers below
Explanation:
To solve this problem we must use the following equation of kinematics.
[tex]v_{f}=v_{o}+a*t[/tex]
But first we must convert the velocity from kilometers per hour to meters per second.
[tex]72[\frac{km}{h}]*[\frac{1000m}{1km}]*\frac{1h}{3600s} =20[m/s][/tex]
i)
Vf = final velocity = 20 [m/s]
Vo = initial velocity = 0 (stars from the rest)
a = acceleration [m/s²]
t = time = 4 [s]
[tex]20 = 0+a*4\\a=20/4\\a = 5[m/s^{2}][/tex]
ii)
Now we can calculate the distance with the following equation of the kinematics.
[tex]v_{f}^{2}=v_{o}^{2} +2*a*x[/tex]
where:
x = distance covered [m]
[tex]20^{2} =0 +2*5*x\\400=10*x\\x = 40 [m][/tex]
Calculate the current in each 10.0 Ω resistor in the series circuit and in the parallel circuit if the power supply is 60.0 V.
Answer:
Explanation:
Step one:
given data
the current in each 10.0 Ω
The power supply is 60.0 V.
Required:
current in the series and parallel circuit arrangement
Step two:
The drawing looks like a ladder with 4 rungs.
One rung is a 60-volt battery.
The other 3 rungs are the 3 resistors.
a). The equivalent resistance is the reciprocal of (1/10 + 1/10 + 1/10).
That's the reciprocal of 3/10, or about 0.3ohms.
b). I = V/R = 60 /0.3... = 200 Amperes.
Answer:
for series: i=v/r
V=60volts
R=30ohms (added ohms of the 3 resistors)
i=60volts/30ohms
i=2amps
for parallel: i=v/r1 + v/r2 ...
v=60volts
r1=10
r2=10
r3=10
i=60/10+60/10+60/10
i=6+6+6
i=187
Explanation:
https://phys.libretexts.org/Bookshelves/University_Physics/Book%3A_University_Physics_(OpenStax)/Book%3A_University_Physics_II_-_Thermodynamics_Electricity_and_Magnetism_(OpenStax)/10%3A_Direct-Current_Circuits/10.03%3A_Resistors_in_Series_and_Parallel
A cyclist speeds up from 3 m/s to 7 m/s in 8 seconds.
a. What is its change in velocity
Answer:
cant see to find the answer sorry :( i tried :( good luck !! youll do great <333
Explanation:
sorry ;( best of luck
Please HELPPPPP!
A force is a push or a __. It causes an object at rest to __. It can cause an object that is moving to change __, or the distance covered over time. It can also change which way the object is moving its __. Lastly, it can also cause an object to __ moving completely. A force has both __ and direction. An object with __ forces or a net force of __ will not change position.
Word Bank:
Speed
Magnitude
balanced
Stop
Zero
Pull
Move
Direction
Answer:
A force is a push or a pull. It causes an object at rest to move. It can cause an object that is moving to change speed, or the distance covered over time. It can also change which way the object is moving its direction. Lastly, it can also cause an object to stop moving completely. A force has both magnitude and direction. An object with balance forces or a net force of zero will not change position.
Explanation:
Explain what happens as an object moves through each phase of matter.
ASAP PLEASE HELP ME????????
Answer:
gas vibrate, move about freely at high speeds, liquid vibrate, move about, and slide past each other. solid vibrate (jiggle) but generally do not move from place to place
Which best explains how a heat pump can heat a room?
Cold air from the house is moved through pipes, where it absorbs thermal energy.
Warm air from outside is pushed into the house to replace the cold air.
Combustion warms the air when chemical energy is transferred to thermal energy.
Fuel is used to move a piston, which pushes warm air into the house.
Answer:
Cold air from the house is moved through pipes, where it absorbs thermal energy.
Explanation:
Answer:
Like your refrigerator, heat pumps use electricity to move heat from a cool space to a warm space, making the cool space cooler and the warm space warmer. ... The most common type of heat pump is the air-source heat pump, which transfers heat between your house and the outside air.
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What type of microscopy works by allowing only light waves that have reflected from or refracted though the sample to enter the lens system
Answer:
dark-field microscopy
Explanation:
A darkfield microscope can be regarded as a brightfield microscope with a significant modification to condenser. There is an opaque disk, with a diameter of about 1cm placed in between the illuminator and condenser lens, the disk responsible for the blocking of most of the light from the illuminator, passing through the condenser to objective lens , which will then form hollow cone of light that has its focus on the specimen. Using a darkfield microscope the light that get to the objective is the only refracted or reflected light of structures in the specimen. And the image formed usually display a bright object with a dark background.
It should be noted that darkfield microscope is a type of microscopy works by allowing only light waves that have reflected from or refracted though the sample to enter the lens system.
The two types of biogenous sediments are calcareous ooze and _____ ooze.
Answer:
The two types of biogenous sediments are calcareous ooze and siliceous ooze
Explanation:
HELP PLS I NEED THIS
Answer:
1.318m
Explanation:
The set up is a right angled triangle
Horizontal distance is the distance covered by the hurdler = 0.535m =adjacent
Angle of elevation = 67.9°
Height of the hurdler = opposite
Using the SOH CAH TOA identity
Using the TOA identity
Tan67.9° = opp/adj
Tan67.9 = opp/0.535
Opp = 0.535tan67.9°
Opp = 1.318m
Hence the required height is 1.318m
Imagine you've recently insulated your loft. Give a reason why your heating bill may still increase.
Answer:
follow me for the answer
Kathy 82 kg performer standing on a diving board at the carnival dive straight down into a small pool of water. Just before striking the water her speed is 5.50M/S at a time of 1.65 after entering the water her speed is reduced to 1.10M/S. What is the force that acts on her when she is in the water
Solution :
Given weight of Kathy = 82 kg
Her speed before striking the water, [tex]$V_o $[/tex] = 5.50 m/s
Her speed after entering the water, [tex]$V_f$[/tex]= 1.1 m/s
Time = 1.65 s
Using equation of impulse,
[tex]$dP = F \times dT$[/tex]
Here, F = the force ,
dT = time interval over which the force is applied for
= 1.65 s
dP = change in momentum
dP = m x dV
[tex]$= m \times [V_f - V_o] $[/tex]
= 82 x (1.1 - 5.5)
= -360 kg
∴ the net force acting will be
[tex]$F=\frac{dP}{dT}$[/tex]
[tex]$F=\frac{-360}{1.65}$[/tex]
= 218 N
What type of material does not transfer heat well?
O A. A thermal conductor, such as air
B. A thermal insulator, such as water
O C. A thermal conductor, such as water
OD. A thermal insulator, such as air
Answer:
insulator
Explanation:
it keeps heat in not moves it
What force is represented by vector a
Answer:
velocity
Explanation:
Velocity represents the direction of an object with a specified speed
Acceleration due to gravity on Planet X is 4.5 m/s2 and the weight of an astronaut is 351 N. What is the mass of the astronaut?
Answer:
312
Explanation: