Answer:
height =20m
Explanation:
gpe=mgh
800=4×10×x
40x=800
x=20
There is a spot of paint on the front wheel of the bicycle. Take the position of the spot at time t=0 to be at angle θ=0 radians with respect to an axis parallel to the ground (and perpendicular to the axis of rotation of the tire) and measure positive angles in the direction of the wheel's rotation. What angular displacement θ has the spot of paint undergone between time 0 and 2 seconds?
Here is the missing information.
An exhausted bicyclist pedal somewhat erraticaly when exercising on a static bicycle. The angular velocity of the wheels takes the equation ω(t)=at − bsin(ct) for t≥ 0, where t represents time (measured in seconds), a = 0.500 rad/s2 , b = 0.250 rad/s and c = 2.00 rad/s .
Answer:
0.793 rad
Explanation:
From the given question:
The angular velocity of the wheel is expressed by the equation:
[tex]\omega (t) =\dfrac{d\theta}{dt}[/tex]
The angular velocity of the wheels takes the description of the equation ω(t)=at−bsin(ct)
SO;
[tex]\dfrac{d \theta}{dt} = at - b \ sin \ ct[/tex]
dθ = at dt - (b sin ct) dt
Taking the integral of the above equation; we have:
[tex]\int \limits^{\theta}_{0} \ d \theta = \int \limits ^{t=2}_{0} at \ dt - (b \ sin \ ct) \dt[/tex]
[tex][\theta] ^{\theta}_{0} = a \bigg [\dfrac{t^2}{2} \bigg]^2_0 - \bigg[ -\dfrac{b}{c} \ cos \ ct \bigg] ^2_0[/tex]
where;
a = 0.500 rad/s2 ,
b = 0.250 rad/s and
c = 2.00 rad/s
[tex]\theta = (0.500 \ rad/s^2 ) \bigg [\dfrac{(2s)^2}{2} \bigg] - \bigg[ -\dfrac{0.250 \ rad/s}{2.00 \ rad/s} \ cos \ (2.00 \ rad/s )( 2.00 \ s) \bigg] - \bigg [ \dfrac{0.250 \ rad/s}{2.00 \ rad/s}\bigg ] cos 0^0[/tex]
[tex]\mathbf{\theta = 0.793 \ rad}[/tex]
Hence, the angular displacement after two seconds = 0.793 rad
Which of the following is strenuous?
Atraining for an athletic competition
Bsharing a candy bar with a friend
Creading an exciting mystery
Dforgetting to complete your homework
Answer:
I think it c
Explanation:
Answer:
Atraining for an athletic competition
At its closest approach, a moon comes within 200,000 km of the planet it orbits. At that point, the moon is 300,000 km from the other focus of its orbit, f2. The planet is focus f1 of the moon's elliptical orbit. How far is the moon from the planet when it is 260,000 km from f2?
Answer:
s₁ = 240,000 km
Explanation:
The distance between both the focuses f₁ and f₂ will be the sum of distances of the moon from each focus at a given point. Therefore,
s = s₁ + s₂
where,
s = total distance between the focuses = ?
s₁ = distance between f1 and moon = 200,000 km
s₂ = distance between f₂ and moon = 300,000 km
Therefore,
s = 200,000 km + 300,000 km
s = 500,000 km
Now, when the distance from f₂ becomes 260,000 km, then the distance from f₁(planet) will become:
s = s₁ + s₂
500,000 km = s₁ + 260,000 km
s₁ = 500,000 km - 260,000 km
s₁ = 240,000 km
Q: How can variations in the rate of interaction between the hydrosphere and the atmosphere result in global climate change?
A. by causing droughts and floods
B. by producing more greenhouse gases
C. by changing the amount of water on Earth
D. by decreasing the atmospheric temperature
What does is the glenohumeral joint and what does it do? (ANATOMY)
how does the molecular structure of a material influence its physical properties?
As the shape of a molecule has a lot to do with the polarity of the compound, the molecular structure influences the molecular properties. Polar compounds tend to dissolve in polar compounds, forming solids or liquids with higher boiling and melting points.
What are physical properties?A physical property is a property of matter that is unrelated to changes in its chemical composition. Density, color, hardness, melting and boiling points, and electrical conductivity are all examples of physical properties.
In the solid state, the structure determines how individual polymer molecules can orient. As a result, physical properties such as density, crystallinity, melting point, and strength are affected.
Intermolecular forces - forces that attract one molecule to its neighbors - van der Waals attractions or hydrogen bonds - govern physical properties.
Because the intermolecular forces of attraction are relatively weak, molecular substances tend to be gases, liquids, or low melting point solids.
Thus, this way the molecular structure of a material influence its physical properties.
For more details regarding physical properties, visit:
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What is the formula for freefall?
Answer: vf = g * t
Explanation:
G represents the acceleration of gravity.
T represents time so multiply the acceleration of gravity times time.
A golfer hits a ball at 10.5 m/s at an angle of 25 degrees.
a) How long will the ball be moving?
B) How far will the ball go? C) How high will the ball go?
An example of a chemical change is water boiling
Answer:
False, Boiling water is an example of a physical change and not a chemical change
Answer:
yes
Explanation:
cos from the boiling water, you can still get another change
How many
different
elements are
present in
C6H12O6 ? How do you know
A block weighing 35 N is resting on a steel table (us = 0.40).
The minimum force to start this block moving is ___ N.
Answer: 14
Explanation:
Force(normal)*coefficient
The static friction force is a force that prevents motion of an object kept on a surface, due to the interaction of the surface of the object and the surface on which it is kept
The minimum force required to start the block moving is 14 NReason:
The known parameter are;
The weight of the block, W = 35 N
The static friction of the surface of the table surface, [tex]\mu_s[/tex] = 0.40
Required:
To find the minimum force to start the block moving
Solution:
The force required to start the block moving is given by the frictional force that needs to be surpassed
Force required, F = Force of friction
Force of friction = Normal reaction × Coefficient of static friction
On a flat surface, the normal reaction = The weight of the object
∴ Force of friction, [tex]F_f[/tex] = Weight of the object × Coefficient of static friction
Which gives;
[tex]F_f = W \times \mu_s[/tex]
[tex]F_f = 35 \, N \times 0.40 = 14 \, N[/tex]
Force required, F = Force of friction, [tex]F_f[/tex] = 14 N
The minimum force required to start the block moving, F = 14 N
Learn more about the static friction force here:
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PLSS THIS LOOKS SIMPLE Tina throws a softball up with an initial speed of 25 meters per second. Calculate the maximum height that the ball will reach.
Answer:
31.86m
Explanation:
recall that one of the equations of motion can be written
v² = u² + 2as
where
u = initial velocity = 25m/s
v = final velocity = 0m/s because at maximum height, the ball will momentary stop moving (i.e have zero velocity)
a = acceleration = -9.81m/s² (i.e a deceleration as it moves upwards equal to the magnitude of the gravitational acceleration)
s = distance (we are asked to find this)
substituting these into the equation:
v² = u² + 2as
0² = 25² + 2(-9.81)s
0 = 625 - 19.62s
19.62s = 625
s = 625 / 19.62
s = 31.86m
which type of energy is released when a nucleus is split apart?
a. kinetic energy
b. elastic energy
c. chemical energy
d. nuclear energy
Answer:
D. Nuclear energy
Explanation:
A nucleus is the result of nuclear energy if it is split into an other the same result shall happen it being nuclear energy.
Kara is pushing a shopping cart to the right. The applied force is acting _______.
A.) upward
B.) downward
C.) to the left
D.) to the right
Answer:
D.) to the right
Kara is pushing a shopping cart to the right. The applied force is acting _______.
A.) upward
B.) downward
C.) to the left
D.) to the right
Answer:
D
Explanation:
D.) to the right
What are the three sources of heat (energy) on earth?
[10 POINTS ❗️❗️ and brainlist :)]
Roy throws a ball up in the air. Each time he throws the ball up in any direction, it falls back to the ground as shown in the illustration. The ball comes back to the ground because of the
A) weak electric force of the earth.
B) strong magnetic force of the earth.
C) force of air resistance on the ball.
D) strong gravitational force of the earth.
Answer:
D) Strong gravitational force of the earth
Explanation:
Gravitational force is the force that attracts to objects with mass.This forces tries to pull masses together, that is why attractive in nature.
Define kinetic energy in your own words, and write a statement about how kinetic energy is affected as velocity increases.
Thank you if you them
Answer:
Explanation:
3. The word circuit means "go around", therefore a circuit is a pathway or closed path around which electricity (or water) flows.
4. Electrons flowing through a wire can be compared to water flowing through a hose. Once the flow of electrons or water is going, work, is performed.
5. You would get shocked in a bumper car by touching the floor and the ceiling at the same time. This means you are completing the circuit allowing electricity to flow.
6. Electricity from a wall outlet has enough energy to stop your heart.
7. Electricity is the flow of electrons, because electrons move or jump from atom to atom.
8. Materials that allow electrons to move easily from atom to atom are called conductors.
9. Materials that do not allow electrons to flow easily are called insulators.
10. Semi- conductors are materials that are somewhere in between .
11. Voltage is the force or pressure of electricity and is compared to the amount of water pressure in a hose.
12. Current (amps ) is the amount of electricity and is compared to the amount of water in a hose .
13. Watts (power) is the term for work performed by electricity.
Best Answer gets Brainiest
Draw the (Quantitative) velocity vs time graphs for an object whose motion produced the position vs time graphs in the graphs below. Show your work.
Answer:
yoo yoo
24
Explanation:
What is the average translational KE of 5 moles of gas molecules at 300 K?
a.
2.1 x 103 J
b.
1.87 x 104 J
c.
1.78 x 105 J
d.
1.68 x 106 J
Answer:
What is the average translational kinetic energy of molecules in an ideal gas at 37°C? The average translational energy of a molecule is given by the equipartition theorem as, E = 3kT 2 where k is the Boltzmann constant and T is the absolute temperature.
Explanation:
The average translational energy of a molecule is given by the equipartition theorem as, E = 3kT 2 where k is the Boltzmann constant and T is the absolute temperature.
what is the temperature of air if the speed of sound is 295m/s?
Answer:
Explanation:The speed of sound depends on several variables, but the only independent variable we need to calculate the speed of sound ... Enter your air temp and choose your units: The speed of sound: mph. Fahrenheit, knots. Celsius, m/s. Kelvin, ft/s.
plz answer this...its urgent!!
its about gravitation..only 3 questions
Answer: For #1, 7.3 m/s2.
Explanation: See this wikipedia screenshot for explanation, it's complicated.
Why is it difficult to charge a metallic rod with the method of friction?
pls answer quick
I got exam tomorrow
Insulators can be easily charged by friction as the extra electrons gained CANNOT easily escape. Conductors: materials that allow electrons to flow through them easily. Conductors CANNOT be easily charged by friction as the extra electrons gained can easily escape. When negatively charged rod is put near a metal can
A 2 kg toy car moves at a speed of 5 m/s. a. What is the kinetic energy of the car?
Answer:
25 JExplanation:
The kinetic energy of the toy car can be found by using the formula
[tex]k = \frac{1}{2} m {v}^{2} \\ [/tex]
m is the mass
v is the velocity
From the question we have
[tex] k = \frac{1}{2} \times 2 \times {5}^{2} \\ = 1 \times {5}^{2} [/tex]
We have the final answer as
25 JHope this helps you
Which pair has the same electron configuration?
a. Cl- and Ar
b. Cl- and Ar
c. CI and Ar
d. CI+ and Ar
Answer:
Cl- and Ar is the right answer:-)
If you see a dark mass similar to a blown-up balloon at the top of a volcano, what type of feature are you most likely viewing?
a lava dome
a flood basalt plateau
a geyser
a newly formed island
Sorry I marked it as physics, because it should be science but there isn't a subject for that :(
Answer:
Lava dome
Explanation:
A geyser is hot water being shot up from the ground
A newly formed island would be somewhere on the ground not directly above a volcano (Well depending on where the volcano is anyways)
A flood basalt plateau is like rocks I think?
The energy is different within each wave type across the spectrum true or false
Answer:
T kinda waky tho -_-----_-----_-////_----_---///
Explanation:
Answer:
true
Explanation:
You pull horizontally on a 50 kg crate with a force of 400N and the friction force on the crate in 150N. What is the acceleration of the crate?
If you pull horizontally on a 50 kg crate with a force of 400 N and the friction force on the crate of 150 N, then the acceleration of the crate would be 5 m / s² .
What is Newton's second law?Newton's Second Law states that The resultant force acting on an object is proportional to the rate of change of momentum.
As given in the problem if you pull horizontally on a 50 kg crate with a force of 400 N and the friction force on the crate in 150 N.
The net force acting on the crate = 400 N - 150 N
= 250 N
The acceleration of the crate = 250 / 50
= 5 m / s²
Thus, the acceleration of the crate would be 5 m / s² .
Learn more about Newton's second law here, refer to the link given below ;
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ANSWER ASAP PLEASE!!
if light photons are massless then why are they attracted by black holes?
Answer:
Photons have no mass, they do have energy, and the gravity of a black hole (or any other gravitating body) will attract them.
Explanation:
is that what you wanted?