Answer: c
Explanation:
A glass of water with a mass of 0.35 kg rests on the edge of a desk 0.85 m above the floor. Given that the acceleration due to gravity is 9.8 m/s2. so, the glass's potential energy is 2.92 Joule.
To find the potential energy,
The given values are,
Mass m = 0.35 Kg
Height h = 0.85 m
g = 9.8 m/s²
What is Gravitational Potential Energy?Gravitational potential energy is the energy stored in an object because of its vertical position or height in a gravitational field.
It can be calculated with the equation:
U = mgh Joules.
Where m is the mass of the object,
h is the height with respect to a fixed reference, and
g is the acceleration of gravity, or 9.8 m/s^2.
The glass of water has a mass of m=0.35 kg and it's located at a height of h=0.85 m. Calculating the potential energy:
U = 0.35× 9.8×0.85
U = 2.9155 Joules.
The glass's potential energy is 2.92 Joule.
Hence, Option C is the correct answer.
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While standing on a balcony a child drops a penny. The penny lands on the ground floor 1.5 s later. How fast was the penny traveling vertically when it struck the ground floor?
*The height of the balcony is 11.025 meters
Answer:
14.7 m/s.
Explanation:
From the question given above, the following data were obtained:
Time (t) = 1.5 s
Acceleration due to gravity (g) = 9.8 m/s².
Height = 11.025 m
Final velocity (v) = 0 m/s
Initial velocity (u) =?
We, can obtain the initial velocity of the penny as follow:
H = ½(v + u) t
11.025 = ½ (0 + u) × 1.5
11.025 = ½ × u × 1.5
11.025 = u × 0.75
Divide both side by 0.75
u = 11.025/0.75
u = 14.7 m/s
Therefore, the penny was travelling at 14.7 m/s before hitting the ground.
4. A car accelerates uniformly from rest at 3.2 m/s^.
When the car has traveled a distance of 40.
meters, its speed will be
(1) 8.0 m/s
(2) 12.5 m/s
(3) 16 m/s
(4) 128 m/s
Answer:
A
Explanation:
The final speed of the car is: (3) 16 m/s.
Given the following data:
Initial speed = 0 m/s (since it accelerated from rest).Acceleration = 3.2 [tex]m/s^2[/tex]Distance = 40 meters.To find the final speed of the car, we would use the third equation of motion;
[tex]V^2 = U^2 + 2aS[/tex]
Where:
V is the final speed.U is the initial speed.a is the acceleration.S is the distance covered.Substituting the given parameters into the formula, we have;
[tex]V^2 = 0^2 + 2(3.2)(40)[/tex]
[tex]V^2 = 2[/tex] × [tex]3.2[/tex] × [tex]40[/tex]
[tex]V^2 = 256\\\\V = \sqrt{256}[/tex]
Final speed, V = 16 m/s
Therefore, the final speed of the car is 16 m/s.
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A bridge spanning a river is 98.0 meters above the water.
How long would it take a rock dropped from the bridge to hit the water?
Hey can you plz help me
Leo makes an electrical circuit using a battery, copper connection wires and a
lamp.
1 Diagram the assembly and say if the lamp lights up.
2 Specify the direction of movement of the free electrons.
3 Leo reverses the connections to the battery terminals. In which direction do the
free electrons
An Olympic-class sprinter starts a race with an acceleration of
4.50 m/s^2
. (a) What is her speed 2.40 s later? (b) Sketch a graph of her position vs. time for this period.
Answer:
a) Vf = 10.8 [m/s]
b) See the image attached.
Explanation:
a)
To solve this part we must use the following kinematics equation:
[tex]v_{f} =v_{o} + (a*t)[/tex]
where:
Vf = final velocity [m/s^2]
Vo = initial velocity = 0
a = aceleration = 4.5 [m/s^2]
t = time = 2.4 [s]
Note: The initial velocity is taken as zero, as the athlete starts from rest
Vf = 0 + (4.5*2.4)
Vf = 10.8 [m/s]
b)
Now knowing that acceleration remains constant between the time interval between 0 to 2.4 seconds. We will take 5 different times between the 2.4 elapsed.
Dt = 2.4/5
Dt = 0.48 [s]
So the first time is 0, the second will be (0 + 0.48) = 0.48, the third (0.48 + 0.48) = 0.96, the fourth (0.96 + 0.48) = 1.44, and the fifth (1.44 + 0,48) = 1.92, and the last one (1.92 + 0.48) = 2.4
We need to find the velocity for each time calculated before, with the ecuation used in a) we cand calculate the different velocities.
Vfo = 0 + (4.5*0) = 0
Vf1 = 0 + (4.5*0.48) = 2.16 [m/s]
Vf2 = 0 + (4.5*0.96) = 4.32 [m/s]
Vf3 = 0 + (4.5*1.44) = 6.48 [m/s]
Vf4 = 0 + (4.5*1.92) = 8.64 [m/s]
Vf5 = 0 + (4.5*2.4) = 10.8 [m/s]
The next step is to use the following equation of kinematics, to be able to determine the position of the athlete for each speed.
[tex]v_{f}^{2} =v_{i}^{2} +(2*a*x)\\if \\v_{i}=0\\then\\x = \frac{v_{f}^{2}}{2*a}[/tex]
x1 = 0
x2 = (2.16)^2/(2*4.5) = 0.518 [m]
x3 = (4.32)^2/(2*4.5) = 2.074 [m]
x4 = (6.48)^2/(2*4.5) = 4.67 [m]
x5 = (8.64)^2/(2*4.5) = 8.29 [m]
x6 = (10.8)^2/(2*4.5) = 12.96 [m]
Now in the x-axis we put the time values found before as well the x values en the y-axis.
If the number of homes with a pet dog is equal to 250, how many total homes are represented by the chart?
A.500
B.cannot be determined
C.250
D.125
:)
Answer:
Option A. 500
Explanation:
From the question given, we obtained the following:
Numbers of home with pet dogs = 250
Percentage with pet dogs = 50%
Total number of homes =.?
Thus, we can obtain the total number of homes represented by the chart as follow:
Let T be the total number of Homes.
Number of homes with dog = percentage of homes with dog × total number
Numbers of home with pet dogs = 250
Percentage with pet dogs = 50%
Total number of homes = T
250 = 50% × T
Divide both side by 50%
T = 250 ÷ 50%
T = 250 ÷ 50/100
T = 250 × 100/50
T = 250 × 2
T = 500
Therefore, the total number of homes represented by the chart is 500.
3. A car advertisement states that a certain car can accelerate from rest to 70 km/h in 7 seconds.
Find the car's average acceleration.
Answer:
10 km/s^2
Explanation:
Acceleration = velocity/time
a= 70km/7s
= 10km/s^2
Which has more kinetic energy, a 40 kg cheetah running at 25 m/s or a 4,000 kg elephant moving at 2 m/s? How much more energy does it have?
Answer:
1st case; mass=40 kg
v=25m/s
K.E.=1/2[40][25]^2=12,500 J
2nd case; mass=4,000 kg
v=2 m/s
K.E.=1/2[4000][2]^2=8000J
in case 1 Kinetic energy is greater.
Explanation:
what should scientists do when they see that the data collection or analysis from their experiment phyhas limitations APEX
A. describe the limitations in detail in thier final report.m
B. ignore the limitations when they draw conclusions.
C. repeat the experiment to see if it still has limitations.
D. decide not to report any of the expromental results.
Answer:
C. Describes the limitations in detail in their final report.
Explanation:
A. Describe the limitations in detail in their final report
WILL GIVE BRAINLIEST!!!!!!!!!!!!!!!!!!
Answer:
9)a
10) I think true
11)b
Explanation:
9)a. because it's told that the car is slowing down, the sum of the forces that are towards left, should be more than the ones that are towards right. if the car was gaining speed, "b" would have been correct. and if it was told that the car is moving without a change in the speed, "c" would have been correct.
10) if a moving object has a change of speed or direction, it would have an acceleration. now if a moving object experiences an unbalanced force, it'd either slow down, gain speed or change direction, and in all of the three possibilities it'd have an acceleration.
11) upward and downward forces are equal, and the sum of them would be 0N(because they have opposite directions). so they negate each other.
and the rightward force is 5N more than the leftward force. so the Net Force would be 5N.
-30+30-10+15=5N
if it is unclear or you need more explanation, ask freely.
Scientific notation is a method of expressing very small and very large numbers *
yes
No
a psychologist studies if internet uses causes isolation
A) experimental
B) correlational
C) Descriptive
pls help
If heat is removed from point E and the temperature had not changed, the substance will
A. Condense
B. Boil
C. Melt
D. Evaporate
Answer:
melt
Explanation:
hope it helps you plz mark me brilliantest
Answer:
i think E hola
Explanation:
I dont know
A cyclist accelerates from 0 m/s to 10 m/s in 3 seconds. What is his acceleration?
Answer:
3.33 m/s^2
Explanation:
[tex]a = \frac{v \: - \: u}{t} [/tex]
V = final velocity ( 10m/s^2 )
U = Initial velocity ( 0m/s^2 )
t = Time taken ( 3 s )
[tex]a = \frac{10 - 0}{3} = 3.3333......[/tex]
approximately = 3.33 m/s^2
Heating effect of current is not always useful for us. Support your answer with example
Answer:
is correct
Explanation:
in my think, first this due to ray emitted from the light those ray may be affect our skin or party of body.
A crate is dragged across an ice covered lake. The box accelerates at 0.08 m/s2 and is pulled
by a 47 N force. What is the mass of the box?
Given parameters:
Rate of acceleration of the box = 0.08m/s²
Force applied to the box = 47N
Unknown:
Mass of the box = ?
The force applied on a body is push or pull on it to move it in a specific direction. Force causes the motion of a body.
Mathematically, force is expressed as the product of mass and acceleration;
Force = mass x acceleration
Input parameters and solve for mass;
47 = mass x 0.08
mass = [tex]\frac{47}{0.08}[/tex]
mass = 587.5Kg
The mass of the box is 587.5Kg
Its like almost 12 pm rn and i have school tomorrow so i dunno why im still up but i just wanna know how big the world is. like in miles how long is it all the way around??? i could just look it up but i like to socialize sooooo someone tell me please :)
I dont know what subject to put this under lol
if on average you walk 1.20 meters every second , how long do you walk i one hour?
Answer:
Explanation:
En cuánto tiempo se pueden caminar 20 km? Una persona sana, acostumbrada a andar camina a unos 4 o 5 kilómetros/hora, en terreno llano. Puede tardar 5 horas o 4.
Answer:
4,320meters
Explanation:
Match the term with the correct description.
1. energy levels
2. protons
3. neutrons
4. electrons
c. varying ranges of energy that electrons can have
b. neutrally charged particles
d. negatively charged particles
a positively charged particles
(MICROWAVE)
Describe the device and its function.
In a closed system that has 45 J of mechanical energy, the gravitational
potential energy of a ball rolling down an inclined plane decreases from 8 J to
Answer:
the answer is d
Explanation:
I just did this test
The normal force acts ________________________ to the surface and the friction force act _______________ to the surface.
Why are there no famous women scientists associated with cell theory?
Answer:
there is you just have to look harder
Explanation:
A driver who does not wear a seatbelt continues to move forward with a speed of 18.0 m/s (due to inertia) until something solid like the steering wheel is encountered. The driver now comes to rest in a much shorter distance-perhaps only a few centimeters. Find the magnitude of the net force acting on a 65.0 kg driver who is decelerated from 18.0 m/s to rest in 5.00 cm. A driver who does not wear a seatbelt continues to move forward with a speed of 18.0 (due to inertia) until something solid like the steering wheel is encountered. The driver now comes to rest in a much shorter distance-perhaps only a few centimeters. Find the magnitude of the net force acting on a 65.0 driver who is decelerated from 18.0 to rest in 5.00 . F=3240N F=1.173×104N F=2.113×105N F=4.213×105N
Answer:
F = 2.113 x 10⁵ N
Explanation:
First we need to calculate the deceleration of the driver by using 3rd equation of motion:
2as = Vf² - Vi²
where,
a = deceleration = ?
s = distance = 5 cm = 0.05 m
Vf = Final Velocity = 0 m/s
Vi = Initial Velocity = 18 m/s
Therefore,
2a(0.05 m) = (0 m/s)² - (18 m/s)²
a = (- 324 m²/s²)/0.1 m
a = - 3240 m/s²
where, negative sign represents deceleration
From Newton's Second Law of Motion:
F = ma
F = (65 kg)(-3240 m/s²)
F = - 2.106 x 10⁵ N
So, he closest answer is:
F = 2.113 x 10⁵ N
non-native species that have rapidly increasing populations that spread
and displace native species
Answer:
Invasive Species
Explanation:
Plz give brainliest
An object is moving to the left and is slowing down. its acceleration is
Answer:
According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration.
An object is moving to the left and is slowing down. its acceleration is acting in opposite direction of motion, that is, in right direction.
What is acceleration?The rate at which velocity changes with time in terms of both speed and direction is referred to as acceleration. A point or object moving in a straight line is accelerated if it accelerates or decelerates. Even if the speed is constant, motion on a circle is accelerated because the direction is constantly changing. Both effects contribute to acceleration in all other types of motion.
Acceleration is a vector quantity because it has both a magnitude and a direction. Velocity is a vector quantity as well. The change in the velocity vector in a time interval divided by the time interval is defined as acceleration.
Hence, an object is moving to the left and is slowing down. its acceleration is acting in opposite direction of motion.
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The corpus callosum is comprised of more than 200 million axons that connect the hemispheres of the brain. Please select the best answer from the choices provided T F
Hello, love! The answer is True, or T, on Edge2020.
Hope this helped!
~ V.
Answer:
'Tis True my friends
Explanation:
A red bouncy ball is dropped from 10 meters high. As it fails a wind is blowing horizontal at the speed of 15 m/s. How far horizontally will the ball hit from the point at which it was dropped? Please round to 1 decimal place. You will enter in units of meters but NUMBER ONLY.
6.A truck drives to a rock quarry at a speed of 20 m/s. The truck takes on a load of
rocks, which doubles its mass, and leaves at the same speed of 20 m/s. Compare the
kinetic energy of the truck as it left the quarry with its kinetic energy on the way to the
quarry. Explain your answer.
Explanation:
The kinetic energy is basically the energy possesses by virtue of a body's motion
1. The truck moving to the quarry
let the mass be x
and the velocity is given as 20m/s
we know that the kinetic energy is given as
KE=1/2mv^2
KE=1/2(x)*20^2
KE=1/2(x)400
KE=200x
2. The truck leaving to the quarry
let the mass be 2x
and the velocity is given as 20m/s
we know that the kinetic energy is given as
KE=1/2mv^2
KE=1/2(2x)*20^2
KE=1/2(2x)400
KE=400x
From the analysis the kinetic energy is a function of mass, doubling the mass doubles the kinetic energy
Explain why a schoolbus appears to be yellow.
A. Yellow light is absorbed, while all other colors are reflected.
B. All colors are reflected, but yellow is reflected at a more direct angle.
C. All colors are reflected, but only yellow makes it to your eyes.
D. Yellow light is reflected, while all other colors are absorbed.
