Answer:
Applications of Gravitational Force:
Gravity keeps your feet on the ground. Gravity holds the air down. Gravity makes the Earth roughly spherical. Gravity keeps the Moon (and all those artificial satellites) orbiting around the Earth. Gravity keeps the Earth orbiting around the Sun and the Sun orbiting around the galactic centre. Gravity creates the water pressure that runs hydroelectric turbines at the bottom of dams. Gravity brings the rain back down after it evaporates into the atmosphere.The Doppler shift involves a shift in the ___________________. Check all that apply. Group of answer choices actual intensity produced by the source of sound actual frequency produced by the source of sound the perceived pitch of sound observed by a listener the loudness of sound observed by a listener none of these
Answer:
actual frequency produced by the source of sound
Explanation:
According to Oxford dictionary; Doppler effect is"an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other."
The actual change in frequency of a wave is called the Doppler shift. The Doppler shift is caused by a constant relative motion between the source of the wave and the observer. This leads to a change in the observed frequency of the wave.
I will mark you as brainliest
pls ans
a) Name the graph?
b) In first 2 s the object is said to be in ______________ motion.
(uniform motion / uniform acceleration)
c) The portion BC of the graph represents which type of motion?
d) Find out acceleration in first 2 s?
I don't know♀ what is your favorite song
moon problem please help!
crescent moon
gibbous moon
new moon
quarter moon
Answer:
crescent Moon crescent Moon
An 85.0-N crate of apples sits at rest on a ramp that runs from the ground to the bed of a truck. The ramp is inclined at 28.0° to the ground. A) The interaction partner of this normal force has what magnitude and direction? B) The normal and frictional forces are perpendicular components of the contact force exerted on the crate by the ramp. What is the magnitude and direction of the contact force?
Answer:
A 75.1 N and a direction of 152° to the vertical.
B 85.0 N at 0° to the vertical.
Explanation:
A) The interaction partner of this normal force has what magnitude and direction?
The interaction partner of this normal force is the component of the weight of the crate perpendicular to the ramp. It has a magnitude of 85cos28° = 75.1 N and a direction of 180° - 28° = 152° to the vertical(since it is directed downwards perpendicular to the ramp).
B) The normal and frictional forces are perpendicular components of the contact force exerted on the crate by the ramp. What is the magnitude and direction of the contact force?
Since this force has to balance the weight of the crate, its magnitude is 85.0 N. Its direction has to be vertically opposite to that of the weight.
Since the weight is 180° to the vertical (since it is directed downwards), this force is 0° to the vertical.
So, this force has a magnitude of 85.0 N and a direction of 0° to the vertical.
A 32.0 kg cart is at rest on a frictionless, horizontal surface. The cart experiences an unbalaced force, causing the cart to accelarate at a rate of +5 m/s2.
Calculate the time it takes for the cart to travel 200 meters.
Answer:
t = 8.94 s
Explanation:
We will use the second equation of motion to calculate the time taken by the cart:
[tex]s = v_it + \frac{1}{2} at^2[/tex]
where,
s = distance = 200 m
vi = initial speed = 0 m/s
t = time taken = ?
a = acceleration = 5 m/s²
Therefore,
[tex]200\ m = (0\ m/s)(t)+\frac{1}{2}(5\ m/s^2)t^2\\\\t^2 = \frac{(200\ m)(2)}{5\ m/s^2}\\\\t = \sqrt{80\ s^s}[/tex]
t = 8.94 s
A 75 kg refrigerator is located on the 70th floor of skyscraper (300 meters above ground). What is the potential energy of the refrigerator. (PE=MGH(G=9.8M/S²)
Answer:
220,500 Joules
Explanation:
PE = (75 kg) x (9.8 [tex]m/s^{2}[/tex]) x (300 m)
PE = (735) x (300)
PE = 220,500 Joules
Answer:
googli moogli
Explanation:
I WILL MARK YOU THE BRAINLIEST NO LINKS
What type of friction is acting on the airplane?
sliding friction
static friction
fluid friction
rolling friction
Answer:
I believe it's sliding friction.
Explanation:
Charges of +3 µC and –5 µC are 2 mm from each other. The –5 µC charge is replaced with a +5 µC charge.
How will the electrical force between the charges compare with the original force?
same force, but in the opposite direction
same force, but in the same direction
greater force, but in the opposite direction
greater force, but in the same direction
Answer: same force in opposite direction.
Explanation: Charges of opposite sign attracts each other and charges with same sign repel each other. Because only sign of negative charge changes, and absolute value of charge remains same, value of force is same but is in opposite direction.
Answer:
A) same force, but in the opposite direction
Explanation:
he's right
How can a small spark start a huge explosion? using electric forces and molecules
Answer:
Small sparks can lead to huge explosion if they are left unattended.
Explanation:
Small sparks are not harmful but if these sparks happen near some hazardous material or object then it could lead to heavy explosion. If there is some chemical substance near the spark or there are magnetic lines which can explode the spark then these minor sparks could result in heavy disastrous explosion.
it took 50 joules to push a shopping cart 5 meters.with what face was the shopping cart pushed?
Help! Will Mark Brainliest!
A toy mouse has a mass of 2 kg and kinetic energy of 25 J. What is its speed?
A. 4 m/s
B. 3 m/s
C. 6 m/s
D. 5 m/s
Answer:
D 5m/s
Explanation:
A 10.-kilogram object falls freely for a distance of 6.0 meters near Earth's
surface. Which of the following is closest the total kinetic energy gained by
the object as it falls?
A. 60. J
B. 590 J
C. 720 J
D. 1200 J
Given :
A 10.-kilogram object falls freely for a distance of 6.0 meters near Earth's
surface.
To Find :
The total kinetic energy gained by the object as it falls.
Solution :
Since, only conservative force i.e gravity is applied on the object.
So, its total energy is constant.
Total kinetic energy gained = Total potential energy gained
K.E = mgh ( Here, g is acceleration due to gravity = 9.8 m/s² )
K.E = 10 × 9.8 × 6 J
K.E = 588 J
Hence, this is the required solution.
The kinetic energy of an object is proportional to the product of its mass and the square of the velocity of the object.
The kinetic energy of the object is 588 J. Option B shows the kinetic energy of the object.
What is kinetic energy?The kinetic energy of an object is defined as the energy that it possesses due to the motion of the object.
Given that the mass m of the object is 10 kg and it falls from the height h of 6 meters near the earth's surface. The object falls vertically, so the gravitational acceleration is applied to it.
The potential energy of the object is given below.
[tex]PE = mgh[/tex]
[tex]PE = 10 \times 9.8 \times 6[/tex]
[tex]PE = 588 \;\rm J[/tex]
The total force applied to the object is due to gravity only. Hence the total energy of the object will be constant. Thus the kinetic energy of the object will be equivalent to the potential energy of the object.
Hence we can conclude that the kinetic energy of the object is 588 J. Option B shows the kinetic energy of the object.
To know more about kinetic energy, follow the link given below.
https://brainly.com/question/21288807.
Unos observadores en dos pueblos A y B, a cada lado de una montaña de 15 000 pies de altura, miden los ángulos de elevación entre el suelo y la cumbre de la montaña. Suponiendo que los pueblos y la cumbre de la montaña están en el mismo plano vertical, calcule la distancia entre ellos.
xfa ayudenme
Answer:
6the first is a one block and the two are u to be the best in freefire with the best and best name to get
Explanation:
the first time he was a boy and a girl in the 6AM he is a girl who has 6666th grade 6inches
4. What are 3 things that you can think of doing, that would reduce
your electricity bill?
Shane is riding his bike at a speed of 10m/s. He isn't watching carefully where he is going and almost hit a tree. He abruptly it's the brakes to stop in a time of 4 seconds. What is his acceleration show your work
(NO LINKS PLEASE)
Answer:
2.5m/s²
Explanation:
a = v/t
Where;
V = velocity (m/s)
a = acceleration (m/s²)
t = time (s).
According to the information provided in this question,
a = ?
v = 10m/s
t = 4
a = 10/4
a = 2.5m/s²
(answer only if you know the answer or I'll report) Help me please solve it w steps
X component of force Fx=Fcos45=50×cos×45
Y component of force Fy=Fsin45=50×sin×45
Plz I need help with this work
sheet
Answer:
do it your self
Explanation:
Joe places two solid objects in contact with each other.
Which property determines the direction of the flow of heat between the two objects?
Select all the true
A
density of the objects
B
temperature of the objects
C
material of the objects
D
volume of the objects
Answer:
B. temperature of the objects
Calcium is combined with Nitrogen in a chemical reaction. The formula of the compound created, Calcium Nitride, is
Answerrrrrrrrrrrrrrrrrt
Calcium is a 2+ ion which would be written as Ca^2+
Nitrogen is a 3- ion which is written as N^3-
When combined to create Calcium Nitrate it is Ca3N2
See picture:
Homer Agin leads the Varsity team in home runs. In a recent game, Homer hit a 34.5 m/s sinking curve ball head on, sending it off his bat in the exact opposite direction at 23.9 m/s. The actually contact between ball and bat lasted for 0.00075 seconds. Determine the magnitude of the average acceleration of the ball during the contact with the bat in m/s/s. Do not include units or /- sign. Round your answer to a whole number.
Answer:
–77867 m/s/s.
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 34.5 m/s
Final velocity (v) = –23.9 m/s
Time (t) = 0.00075 s
Acceleration (a) =?
Acceleration is simply defined as the rate of change of velocity with time. Mathematically, it is expressed as:
Acceleration = (final velocity – Initial velocity) /time
a = (v – u) / t
With the above formula, we can obtain acceleration of the ball as follow:
Initial velocity (u) = 34.5 m/s
Final velocity (v) = –23.9 m/s
Time (t) = 0.00075 s
Acceleration (a) =?
a = (v – u) / t
a = (–23.9 – 34.5) / 0.00075
a = –58.4 / 0.00075
a = –77867 m/s/s
Thus, the acceleration of the ball is –77867 m/s/s.
What can a light source emit more than one of?
Answer:
What is Emission of Light? Atoms, molecules, or solids that are excited to high energy levels can decay to lower levels by emitting radiation (emission or luminescence). ... Atomic emission and molecular fluorescence are therefore useful for quantitating emitting species.
Explanation:
correct me if i am wrong
Monochromatic light falling on two very narrow slits 0.048mm apart. Successive fringes on a screen 5.00m away are 6.5cm apart near the center of the pattern.What is the wavelength and frequency of the light?
Answer:
λ = 5.85 x 10⁻⁷ m = 585 nm
f = 5.13 x 10¹⁴ Hz
Explanation:
We will use Young's Double Slit Experiment's Formula here:
[tex]Y = \frac{\lambda L}{d}\\\\\lambda = \frac{Yd}{L}[/tex]
where,
λ = wavelength = ?
Y = Fringe Spacing = 6.5 cm = 0.065 m
d = slit separation = 0.048 mm = 4.8 x 10⁻⁵ m
L = screen distance = 5 m
Therefore,
[tex]\lambda = \frac{(0.065\ m)(4.8\ x\ 10^{-5}\ m)}{5\ m}[/tex]
λ = 5.85 x 10⁻⁷ m = 585 nm
Now, the frequency can be given as:
[tex]f = \frac{c}{\lambda}[/tex]
where,
f = frequency = ?
c = speed of light = 3 x 10⁸ m/s
Therefore,
[tex]f = \frac{3\ x\ 10^8\ m/s}{5.85\ x\ 10^{-7}\ m}\\\\[/tex]
f = 5.13 x 10¹⁴ Hz
A car starts from rest and goes due east reaching a speed of 40 m/s What additional information is needed in order to calculate the acceleration of the car?
O A. the total distance traveled by the car
B. the total time of the car's motion
Cthe car's mass
O D. the car's initial velocity
Answer:leter B the answer
Explanation:
The additional information is needed in order to calculate the acceleration of the car is the total time of the car's motion.
What is acceleration?The acceleration of an object is the rate of change of velocity with time.
a = Δv/t
where;
Δ v is change in velocity = final velocity - initial velocityt is the time of motionWhen the change in velocity of the object and time of motion is known, the acceleration of the object can be determined.
Thus, the additional information is needed in order to calculate the acceleration of the car is the total time of the car's motion.
Learn more about acceleration here: https://brainly.com/question/14344386
If there are 1,600 meters in a mile, find the speed of sound in this experiment in units of "miles / hour"
Answer:
v = 771.75 mile / h
Explanation:
The speed of sound is v = 343 m / s at T= 20C
the transformation ratios are
1 mile = 1600 m
1 h = 3600 s
Let's reduce
v = 343 m / s (1 mile / 1600 m) (3600 s / 1 h)
v = 771.75 mile / h
what came first the chicken or the egg
Answer:
The Egg
Explanation:
personally the Chicken who would lay the egg would have to come from an Egg itself, then It would have to grow up and then Produce an egg that will produce a chicken and so on.
I WILL MARK YOU THE BRAINLIEST
What is the net force acting on the airplane?
740 N right -->
700 N right -->
100 N left <--
760 N right -->
Explanation:
700N right
to get the net force
you gotta let one direction be the negative ( the smaller force)
so the total force towards the left is 100N ( 60 + 40= 100)
which is smaller than the right force which is 800 N so you let 100 N be negative
so without even calculating , you can know that it will be moving towards the right because right force > left force
your add both forces ( remember 100 N is negative)
so 800N + ( - 100N)
= 700N
towards the right
hope this helps
this is just one method that helped me understand
please mark it brainliest
A person just supports a mass of 20kg suspended from a rope.
to
20 kg
What is the resultant force acting on the mass?
A ON
B10N
с
20N
D
200N
Answer:
F = 200 N
Explanation:
Given that,
The mass suspended from the rope, m = 20 kg
We need to find the resultant force acting on the rope. The resultant force on the rope is equal to its weight such that,
F = mg
Where
g is acceleration due to gravity
Put all the values,
F = 20 kg × 10 m/s²
F = 200 N
So, the resultant force on the mass is 200 N.
can someone please help me answer this question ?
Answer:
b 60 N force
Explanation:
The change in the momentum is given by the force•distance from the attached point. We don't have any distance, but apparently, the stick forces are being applied in each quarter of the stick, so let's use fractions of 4 to solve it:
150 N:
150•1/4 = 37.5
30 N:
30•2/4 = 30•1/2 = 15
60 N:
60•3/4 = 45
40 N:
40•4/4 = 40•1 = 40
A star produces energy by:
A: creating helium from hydrogen in its core.
B: reflecting energy from nearby stars.
C: absorbing and releasing the matter of other stars.
D: rotating quickly on its axis.
Here, the hydrogen atoms are combined to form a helium atom, and during this process of fusion, a significantly large amount of energy is released. Thus, stars produce a large amount of energy by forming helium from the combination of hydrogen in its core. Hence, the correct answer is option (C).
Answer:
A. Creating helium from hydrogen in its core.
Explanation:
Sacrificed my grade for points I hope it helps
Which of the following measurements has three significant figures
a. 0.0293 kg
b. 0.94 A
c. 5.321 V
d. 10.42 m
Answer:
b. 0.94 i think is the answer