Answer:
????
Explanation:
Which of the following shows levels of organization in living things, from smallest to largest?
A)organ - cell - organ system - tissue
B)organ system - tissue - cell - organ
C)cell - tissue - organ - organ system
D)organ system - organ - tissue - cell.
A moving object has 20 Joules of potential energy and has a mass of 10 kilograms. How fast is the object moving in meters per second?
A child pushes a toy car with a force of 5 N which causes it to accelerate at a rate of 2.0 m/s2. What force would be required to accelerate the toy car at 3.0 m/s2?
Answer:
7.5 N
Explanation:
For is given by :
F = ma
Where
m is mass of an object and is its acceleration
When force is 5 N, its acceleration is 2 m/s². We need to find the force required to to accelerate the toy car at 3.0 m/s².
[tex]\dfrac{F_1}{F_2}=\dfrac{a_1}{a_2}[/tex]
Solving for F₂.
[tex]F_2=\dfrac{F_1a_2}{a_1}\\\\F_2=\dfrac{5\times 3}{2}\\\\F_2=7.5\ N[/tex]
So, it would require 7.5 N of force to accelerate the toy car at 3.0 m/s².
A person travels by car from one city to another with different constant speeds between pairs of cities. She drive 60.0 min at 100.0km/h, 5.0 min at 90.0 km/h, and 40.0 min at 60.0km/h and soends 30.0 min eating lunch and buying gas. (A) determine the average speed for the trip. (B) determine the distance between the intial and final cities alkng the route
Answer:
The average speed for the trip is 65.56 [tex]\frac{km}{h}[/tex] and the distance between the intial and final cities along the route is 147.5 km
Explanation:
You know:
t1= 60.0 min= 1 h v1= 100.0km/ht2= 5.0 min= 1/12 hv2= 90.0 km/ht3= 40.0 min= 2/3 hv3= 60.0km/h t4=30.0 min= 0.5 h= 1/2 hv4= 0 because she stops to eat lunch and buy gas.Speed is a quantity that reflects the space traveled by a body in a unit of time. That is, the average velocity relates the change in position with the time taken to effect said change.
[tex]speed=\frac{change in position}{time}[/tex]
To calculate the average speed of the trip you must calculate the total distance traveled and the total time used.
The total time used for the trip is:
t= t1 + t2 + t3 + t4= 60 min + 5 min + 40 min + 30 min= 135 min= 2.25 h
The distance traveled in each stage of the trip is calculated knowing the speed in that stage and the time used by the expression:
distance= speed*time
Then:
distance1= v1*t1 = 100 km/h * 1 h= 100 kmdistance2= v2*t2 = 90 km/h * 1/12 h= 7.5 kmdistance3= v3*t3 = 60 km/h * 2/3 h= 40 kmdistance4= v4*t4 = 0 km/h * 1/2 h= 0 kmSo, the total distance traveled is calculated as:
d= 100 km + 7.5 km + 40 km + 0 km= 147.5 km
Then, the average speed for the trip is:
[tex]average speed=\frac{total distance}{total time}[/tex]
[tex]average speed=\frac{147.5 km}{2.25 h}[/tex]
average speed= 65.56 [tex]\frac{km}{h}[/tex]
The average speed for the trip is 65.56 [tex]\frac{km}{h}[/tex] and the distance between the intial and final cities along the route is 147.5 km
What is the mass of a 7500N car on earth?
Answer:
Weight of the car F = m*g ; Here, g = 9.81 N/kg ;
So, we can find from the formula mentioned above m = F/g ;
Mass m is equal about 764 kg.
Explanation:
Why is visible light between infrared and ultraviolet
Answer:
The infrared has longer wavelengths (700 nm to 1 mm) than those of visible lights (390 nm to 700 nm). Note though that visible light is the only radiation that can be seen by the human eye. The ultraviolet is much more intense and has a shorter wavelength (400 nm to 10 nm) compared to visible light.
Explanation:
GREETINGS!
Visible light is in between UV and IR region because visible light has a wavelength ranging from 400nm to 700nm, and below 400nm is the region of UV and above 700 is the region of IR, So visible lights is in between UV and IR
To understand things more clearly you could see the electromagnetic spectrum to see which ray lies lies in what region.
HOPE THIS HELPS YOU
which equation states Newton's second law
Newton's second law of motion is expressed by the equation F = m × a. where F is the force and m is the mass of the object.
Where:
F represents the net force acting on an object,
m denotes the mass of the object, and
a represents the acceleration produced by the net force.
According to Newton's second law, the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass.
This equation (F = m × a) is Newton's second law equation.
To know more about Newton's second law:
https://brainly.com/question/15280051
#SPJ4
PLEASE HELP ASAP WILL GIVE 10 PTS
Which item is made from a synthetic material?
A. cotton pants
B. leather jacket
C. tissue paper
D. wicker basket
Answer: A. Cotton Pants
Explanation:
Answer:
A
Explanation:
Platform diving in the Olympic Games took place at a height of 10 meters. a. What is the velocity of a diver entering the water from the platform if he steps off the platform? b.How much time does it take the diver to reach the water from the platform?
Answer:
a)14.0m
b) 1.43s
Explanation:
Using the equation of motion to find the velocity
S = ut+1/2gt²
10= 0+1/2(9.81)t²
10 = 4.905t²
t² = 10/4.905
t² = 2.0387
t = √2.0387
t = 1.43secs
Next is to calculate the velocity using the formula:
v = u+gt
v = 0+(9.81)(1.43)
v = 14.0m/s
just answer this plzz
C, i know this trust me
What would be the mass of a rock falling from the sky if it hits the ground with a force of 98 N?
Assuming you're using the approximation g = 9.8, this means 9.8x is the force of the rock when it hits the ground. Set this equal to 98 and solve for x
9.8x = 98
x = 98/9.8
x = 10
The mass of the rock is 10 kilograms
The mass of a rock falling from the sky if it hits the ground with a force of 98 N will be 9.89 Kg.
What is mass?Mass is a numerical measure of inertia, which is a basic feature of all matter. It is, in effect, a body of matter's resistance to a change in speed or position caused by the application of a force.
The force is given as;
[tex]\rm F=mg \\\\ m = \frac{F}{g} \\\\ m = \frac{98}{9.81} \\\\ m = 9.989\ Kg[/tex]
Hence the mass of a rock falling from the sky if it hits the ground with a force of 98 N will be 9.89 Kg.
To learn more about the mass refer to the link;
https://brainly.com/question/13073862
Which equation correctly represents the gravitational potential energy of a
system?
Answer:
I don't really understand what you are asking but... i can try to help
The formula for potential energy depends on the force acting on the two objects. For the gravitational force the formula is P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
Hope this helps sorry I couldn't answer it☺️
A point charge with charge q1 = 4.00 μC is held stationary at the origin. A second point charge with charge q2 = -4.20 μC moves from the point ( 0.135 m , 0) to the point ( 0.250 m , 0.250 m ). How much work W is done by the electric force on the moving point charge? Express your answer in joules. Use k = 8.99×109 N⋅m2/C2 for Coulomb's constant: k=14πϵ0. View Available Hint(s)
Answer:
The value is
Explanation:
From the question we are told that
The first charge is [tex]q_1 = 4.00 \mu C = 4.00 *10^{-6} \ C[/tex]
The second charge is [tex]q_2 = -4.20 \mu C = - 4.20 *10^{-6} \ C[/tex]
The position of the first charge is [tex](x , y) = (0\ m,0\ m )[/tex]
The initial position of the second charge is [tex](x , y) = (0.135 \ m , \ 0 )[/tex]
The final position of the second charge is [tex](x , y) = (0.250 \ m , \ 0.250 \ m )[/tex]
Generally the electric potential energy of the second charge at initial position is mathematically represented as
[tex]E_1 = \frac{k * q_1 * q_2 }{ r}[/tex]
Here [tex]r= 0.135 \ m[/tex]
So
[tex]E_1 = \frac{8.99 *10^{9} * 4.00 *10^{-6} * (-4.20 *10^{-6}) }{ 0.135}[/tex]
=> [tex]E_1 = -1.119 \ J[/tex]
Generally the electric potential energy of the second charge at initial position is mathematically represented as
[tex]E_2 = \frac{k * q_1 * q_2 }{ r}[/tex]
Here [tex]r= \sqrt{0.250^2 + 0.250^2}[/tex]
=> [tex]r= 0.3536[/tex]
So
[tex]E_2 = \frac{8.99 *10^{9} * 4.00 *10^{-6} * (-4.20 *10^{-6}) }{ 0.3536}[/tex]
=> [tex]E_2 = - 0.4271 \ J[/tex]
Generally the workdone is mathematically represented as
[tex]W = E_2 - E_1[/tex]
=> [tex]W = -0.4271 - (-1.119 )[/tex]
=> [tex]W = 0.6919 \ J[/tex]
what is the frictional force needed to slow an object in motion
Answer:
kinetic friction
Explanation:
The power in an electrical circuit is given by the equation P = I2R, where I is the current flowing through the circuit and R is the resistance of the circuit. What is the power in a circuit that has a current of 0.1 amps and a resistance of 18 ohms?
Answer:
0.18 watt
Explanation:
The following data were obtained from the question:
Current (I) = 0.1 A
Resistance (R) = 18 ohms
Power (P) =.?
P = I²R
Where
P is the power.
I is the current in the circuit.
R is the resistance.
With the above formula, we can obtain the power in the circuit as follow:
P = 0.1² × 18
P = 0.01 × 18
P = 0.18 watt
Therefore, the power in the circuit is 0.18 watt
explain what happens when two light waves traveling from the same direction of displacement meet.
Hint: think about how the crests and troughs of these waves might be affected
Answer:
They hit each other
Explanation:
a dog with mass of 14kg has a kinetic energy of 135.5j. what is the speed of the dog
Answer:
v = 4.39968 m/s
v = 9.8418038654259 mi/h
v = 14.434645669291 ft/s
v = 15.838846732892 km/h
Explanation:
v=KE/1/2m
A car slams on its brakes creating an acceleration of -3.2 m/s². It comes to rest after traveling a distance of 210 m. What was its velocity before it began to accelerate?
Answer: 36.66m/s
Explanation:
Listing everything is gives you:
Vf = 0
a = -3.2
Δx = 210
Vi = ?
Pick one of the kinematic equations to find the missing variable
I used this one: [tex]Vf^2=Vi^2 + 2a[/tex]Δx
When you plug everything in, you get
0 = [tex]Vi^2 -1344[/tex]
add 1344 to both sides and square root to get Vi = 36.66
3. What is the shortest possible time in which a bacterium could travel a distance of 84. cm across a Petri dish
at a constant speed of 3.5 mm/s? *(answer in cm/s)
whats the answer in cm/s
Answer:
240 s
Explanation:
distance = 84 cm
speed = 3.5 mm/s (0.35cm/s)
but speed = distance/time
hence the shortest time taken = distance/speed
= 84/0.35 = 240s
Help number 3 ASAP !!!
Which two phrases describe the nature of an electromagnetic force?
A. Not a fundamental force of nature
B. Produced by interactions between magnetic objects
C. Acts only when objects tough each other
D. Produced by interactions between electrically charged objects
Answer:
I think its C and D
Explanation:
if you are pushing a box with a force of 200n and there is a force of 7 n on the box due to sliding friction, what is the net force on the box
Which one of Newtons laws of motion best explains why the dishes do not move when the table cloth is removed?
AND
A rocket lifting off the ground into space can be explained by (which one of newtons laws?)
Answer:
1. Newtons first law (everything in motion/rest stays in motion/rest untill acted up by and unbalanced force).
2. Newtons third law (every reaction has an equal and opposite reaction)
Explanation:
the si unit of heat energy
Answer:
joule is its si unit in my opinion
1. A wagon, initially traveling at a constant 9.7 m/s, starts going down a hill that creates an acceleration of 4.8 m/s2.
What is the wagon's velocity 6.9 s after it starts accelerating down the hill?
Answer: 24 m/s
Explanation:
A 25-kg mass is suspended 4 meters above the ground. Find its potential energy. Show your work, and use the
rules of significant figures when giving your answer
If a student leaves home at 7:30 AM to walk to his school 2 km away, stops at a neighbor's house for 15 min, then arrives at school at 8:00 AM, what is the student's average speed for the trip to school?
Answer:
The student's average speed for the trip to school is 4 [tex]\frac{km}{h}[/tex]
Explanation:
Speed is a quantity that relates the displacement that an object makes in a given unit of time. In other words, speed is a physical quantity that expresses the relationship between the space traveled by an object, the time used for it and its direction.
Since the average speed relates the change in position to the time taken to effect said change, then:
[tex]speed=\frac{change in position}{time}[/tex]
In this case, the student travels a total distance of 2 km between his home and school and the total time spent on the trip is 30 minutes, then:
change in position= 2 kmtime= 30 minutes= 0.5 hours (being 60 minutes = 60 hours)Replacing:
[tex]speed=\frac{2 km}{0.5 hours}[/tex]
Solving:
speed= 4[tex]\frac{km}{hours}[/tex]
The student's average speed for the trip to school is 4 [tex]\frac{km}{h}[/tex]
Two animals of differing masses are in free fall.
Which factor is missing so that both animals fall with the exact same velocity ?
Momentum
Interia
Gravity
Air resistance
Answer:
i would say Momentum
Explanation:
because they need the quantity of motion
Assume a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 meters per square second.
By how much would its speed reading in- crease each second?
a. 10 m/s
b. 40 m/s
c. A value dependent on its initial speed 4. 30 m/s
d. 5 m/s
e. 20 m/s
HELP ASAP!!!!!
7. Describe two events that occur on Earth that you
would not expect to find on Mars because of the
lack of plate movements.
Answer:
life, the core of mass is made of iron, sulphur i think