Explanation:
u=60
t=90s
a=
v=0
v=u+at
0=60+90a
90a=-60
a=-3/2
The way in which objects exert forces on each other is described by
Which determines the reactivity of an alkali metal?
its boiling and melting points
the shininess of its surface
the number of protons it has
its ability to lose electrons
Answer:
he said its D not A l
l
V
Answer:
D.its ability to lose electrons
Explanation:
Alkali metals are elements present in first group of the periodic table. Following are the metals from top to bottom.
Solar-powered cars use energy from the Sun to work. A panel on the car absorbs light energy from the Sun, which then generates an electric current. This electric current, in turn, allows the car to move. Which shows the correct order of energy transformations that take place in a solar-powered car? electrical, chemical, kinetic electrical, kinetic, radiant radiant, chemical, electrical radiant, electrical, mechanical
Answer:
radiant, electrical, mechanical :)
Answer:
D
Explanation:
radiant, electrical, mechanical
A psychopathologist records the number of criminal offenses among teenage drug users in a nationwide sample of 1,201 participants. To measure the variance of criminal offenses, he computes SS = 10,800 for t his sample. Compute the standard deviation.
Answer:
Standard deviation = 3
Explanation:
Given
[tex]N = 1201[/tex]
[tex]SS = 10800[/tex]
Required
Determine the standard deviation
First, we need to determine the variance;
[tex]Variance = \frac{SS}{N - 1}[/tex]
This gives:
[tex]Variance = \frac{10800}{1201 - 1}[/tex]
[tex]Variance = \frac{10800}{1200}[/tex]
[tex]Variance = 9[/tex]
Know that:
[tex]Variance = SD^2[/tex]
Where SD represents standard deviation
This gives
[tex]9 = SD^2[/tex]
Take square root
[tex]SD = \sqrt 9[/tex]
[tex]SD = 3[/tex]
Is it possible to apply the same amount of force and do different amounts of work?
What is the sum of the forces in an action reaction pair?
А. always less than zero
B. always greater than zero
C. always equal to zero
D. sometimes less than zero
Answer:
C.
Explanation:
For every action there is a opposite negative reaction. So what ever the positive action is there is the negative reaction for it.
For example: +10 action and -10 reaction. It will always equal 0. If it doesn't then you probably might have done something wrong.
Answer:
always equal to zero
Michelle loves basketball, but she recently broke her wrist after falling on the court. The doctor has suggested that she avoid any activity that could jeopardize her recovery or cause further injury until the cast comes off. To modify her activity to maintain her aerobic fitness level, she can (5 points)
Answer:
start running with a arm satchel to keep her arm from moving but still allowing for her legs and lungs to work.
Explanation:
HEY CAN ANYONE HELP ME OUT IN DIS PLS!!!!!!
Answer:
(2) False (4) D, Sublimation
Explanation:
sorry I only know 2 and 4 from the top of my head
What is the correct answer ?
Answer:
c
Explanation:u
Which statement can be supported by using a position-time graph?
A negative slope results when an individual is moving away from the origin.
A horizontal line on the graph means the individual is moving at a non-zero velocity.
A positive slope results when an individual is moving away from the origin.
The speed of an individual cannot be determined from this type of graph.
Column A should be “Time,” and Column B should be “Position.”
Column A should be “Position,” and Column B should be “Time.”
Column A should be “Velocity,” and Column B should be “Speed.”
Column A should be “Speed,” and Column B should be “Velocity.”
Answer:
Explanation:
Think about the equation for velocity. Its the change in position over the change in time. And now think about the formula for slope, its the change in y over the change in x. Now, if you have a position vs time graph, the slope is position over time, the direct formula for velocity. Therefore, the slope of a position vs time graph gives the velocity in that interval. You could take the derivative at that point and get the instantaneous velocity.
In the first argument, the only way to get a negative slope is if youre moving to the left of your initial position as you pass through time. So the claim isnt necessarily true. When you move away from the origin, that simply means youre moving through time.
In the second argument, a horizontal slope means the value is 0. That means there is a value of 0 for your velocity, aka standing still.
In the third argument, a positive slope means youre moving to the right of your initial position as you go through time.
The fourth one is incorrect. Speed is the magnitude of velocity, and the slope can be determined an any point besides vertical slopes, which would require time to literally stop.
I dont understand the very last part of what you posted, so try to make a decision based on what I just explained to you
Answer:
The answer should be
"A positive slope results when an individual is moving away from the origin."
Also known as C on ed 2020
Explanation:
I hope you get this right even tho I may be late, but to all the others who have this question. Stay safe!!!!
Which arrow best represents the path of an object with projectile motion?
A. A ladder in the middle with a vector pointing west.
B. A vector drawn north, labeled B.
C.A vector drawn north, then arcing over, then drawn south labeled C.
D. A vector drawn northeast, labeled D.
Answer:
C.
Explanation:
As should have been explained at the very start of the lesson, it states "Whatever goes up, must come down."
Answer:
C
Explanation:
GIVING BRAINLIEST!! HELP ASAP!! (use the photo for help)
a. Energy is unknown
b. Energy is destroyed
c. Energy does not freely move
d. Energy freely moves
what is oscillatory motion class 7 science question and answers
Answer:
Motion that repeats itself to and fro in a fixed interval of time.
Explanation:
Answer:
A motion repeating itself is referred to as periodic oscillaroty motion.
which si unit whould be most appropriate for describing the length of a shoe?
0.kilometers
0.milimeters
0.milliliters
0.kilomgrams
can u asnswer fast im with my teacher plz
Answer:
Milimeters
Explanation:
This kind of question must be checked with everyday elements, in this way we will analyze each of the options until we reach the appropriate:
kilograms can not be because this unit serves to measure the mass not the length.
kilometers (km) is a unit of length, but however it does not serve for this measurement since a km is equivalent to 1000 meters, therefore measuring the length of a shoe with a ruler measuring 1000 meters is very impractical.
milliliters is a unit of volume, and can often be found in the measurement of volume content of liquids, for example 700 milliliters of milk or 1000 milliliters of water. Therefore it is impractical to measure a shoe with a unit of volume.
In this way the way to measure a shoe correctly is using a ruler or measuring instrument graduated in millimeters.
Answer:millimeters
Explanation:it the only way to measure something that has width length weight height and more stuff like that not the only way but the most easiest
if an object fell 4760 meters in 31.17 seconds what is the average speed
Answer:
your average speed should be 152.7 M/S. total distance divided by the total time will give you your average speed
Which statement describes ionic compounds?
Ionic compounds are positively charged.
lonic compounds are neutral.
Ionic compounds are negatively charged.
1. How are velocity, time, and acceleration
related mathematically?
velocity-time. The relation between velocity and time is a simple one during uniformly accelerated, straight-line motion. The longer the acceleration, the greater the change in velocity. Change in velocity is directly proportional to time when acceleration is constant.
When Marie sees the red traffic light, Marie brakes to a halt from a speed of 70 m/s in just 2 seconds. What is her deceleration?
Answer:
-35 [tex]m/s^2[/tex]
Explanation:
Deceleration is the complete opposite of acceleration and is calculated by adding a negative sign to the formula for finding acceleration.
Since acceleration is calculated by diving the change in velocity with time, deceleration will become:
Deceleration = -Δv/t, where Δv = change in velocity and t = time
In this case, Δv = 70 m/s and t = 2 s, hence;
Deceleration = -70/2 = -35 [tex]m/s^2[/tex]
The deceleration is 35 [tex]m/s^2[/tex].
The force behind electron movement is called
A. voltage B. current C. resistance D. ohm
Answer:
voltage
Explanation:
I'm pretty sure
A car accelerates uniformly in a straight line
from rest at the rate of 3.7 m/s2.
What is the speed of the car after it has
traveled 63 m?
Answer in units of m/s
Answer:
21.59 m/s
Explanation:
recall that one of the equations of motions can be expressed as
v² = u² + 2as
where,
v = final velocity (we are asked to find this)
u = initial velocity = 0m/s (because it says that it starts from rest)
a = acceleration = 3.7m/s²
s = distance travelled = 63 m
simply substitute the known values above into the equation:
v² = u² + 2as
v² = 0² + 2(3.7)(63)
v² = 466.2
v = √466.2
v = 21.59 m/s
WILL GIVE BRAINLIEST TO FIRST PERSON WHO ANSWERS!!!!
A scientist observes a fault where the hanging wall has moved upward relative to the footwall. Which type of fault is the scientist observing?
normal
reverse
strike-slip
horizontal
I AM BEING TIMED
Explanation:
the answer is reverse fault
Answer:
Reverse fault
Explanation:
I play cheer
What unit of measurement do we used for an object’s length, height, & width?
Answer:
metre
Explanation:
the metre is the standard unit of measurement for those distances
how do i explain how to draw a stick figure in Microsoft
Simple!
Depending on the subject, if it's Microsoft drawing, say "It's the same way" but if it's with coding, that is a whole other can of worms
Below is an "oracle" function. An oracle function is a function presented interactively. When you type in a t value, and press the --f--> button the value f(t) appears in the right hand window. There are three lines, so you can calculate three different values of the function at one time. The function f(t) represents the height in feet of a ball thrown into the air, t seconds after it has been thrown. Calculate the instantaneous velocity 1.02 seconds after the ball has been thrown. Instantaneous velocity at 1.02 =
Answer:
The rate of change of height with respect to time is -10.64 feet/sec
Explanation:
Given that,
There are three lines, so you can calculate three different values of the function at one time.
The function f(t) represents the height in feet of a ball thrown into the air, t seconds after it has been thrown.
Given table is,
Time t = 0, 1, 1,02
Function is,[tex]F(t)=-3.053113177191196\times10^{-18},6.000000000000134, 6.41760000000015[/tex]
We need to calculate the initial height of ball
Using equation of motion
[tex]h=h_{0}+ut-\dfrac{1}{2}gt^2[/tex]
Where, h₀ = initial height
u = initial velocity
t = time
g = acceleration due to gravity
At t = 0,
Put the value into the formula
[tex]-3.053113177191196\times10^{-18}=h_{0}+0-0[/tex]
[tex]h_{0}=-3.053113177191196\times10^{-18}[/tex]
We need to calculate the height of ball at t = 1
Using equation of motion
[tex]h_{1}=h_{0}+u_{0}t-\dfrac{1}{2}gt^2[/tex]
Put the value in the equation
[tex]6.000000000000134=-3.053113177191196\times10^{-18}+u-\dfrac{1}{2}\times32[/tex]
[tex]6.000000000000134+3.053113177191196\times10^{-18}+16=u_{0}[/tex]
[tex]u_{0}=22\ feet/s[/tex]
Velocity is the rate of change of height with respect to time
So, velocity at 1.02 sec is given
We need to calculate the height
Using equation of motion
[tex]h=ut-\dfrac{1}{2}gt^2[/tex]
On differentiating w.r.to t
[tex]h'(t)=u-\dfrac{1}{2}g(2t)[/tex]
Put the value into the formula
[tex]h'(t)=22-\times32\times(1.02)[/tex]
[tex]h'(t)=-10.64\ feet/sec[/tex]
Hence, The rate of change of height with respect to time is -10.64 feet/sec.
Choose the nonmetallic elements from the list. Check all that apply.
Yttrium
Oxygen
Boron
Polonium
Argon
Gallium
Carbon
Answer:
Oxygen, Argon, Carbon
edge2020
Answer:
carbon, oxygen, argon,
Explanation:
:)
Photo shows all! Need help ASAP! Will mark brainlist
Answer:
The student is getting different info bc the students probable keeping track of the distance instead of the displacement.
Explanation:
HEY CAN ANYONE PLS HELP ME OUT IN DIS PLS
Answer:
Its the second choice
Explanation:
Answer:
B. 4.80 × 10^4
Explanation:
4.8 × 10^4
= 4.8 × 10,000
= 48,000
I hope this helped!
A velocity vs. time graph for an object is shown.
A graph titled Velocity versus Time shows time in seconds on the x axis, numbered 0 to 5, Velocity in meters per second on the y axis, numbered 0 to 25. A line labeled W starts at the origin and ends at (1, 15). A line labeled X starts at (1, 15) and ends at (2, 20). A line labeled Y starts at (2, 20) and ends at (4, 20). A line labeled Z starts at (4, 20) and ends at (5, 0).
Which parts of the graph represents the object moving at a constant, positive acceleration?
A. W and X
B. X and Y
C. Y and Z
D. W and Z
(please help im so tired)
Answer:
im pretty sure its A, W and X. W and X are the only lines that are moving in a constant positive direction.
Explanation:
Answer:
A- W and X
Explanation:
I got it right on the quiz
Solve for velocity in A car has traveled 456 meters in 45 seconds while driving east on Broad Street. What is the velocity of the car?
Answer:
10.13
Explanation:
take note that velocity is distance over time ([tex]v=\frac{d}{t}[/tex]) so you do 456(distance)÷45(time)= 10.13
what metal can you melt using 1000 degress celcius
If you'll looking for a metal that melts at exactly 1000 degrees celcius, then Red Brass melts at exactly 1000 degrees celcius
