The acceleration due to gravity g at height 7 times the radius of Earth above the surface of the Earth is 8.933 m/s².
What is acceleration due to gravity?It is the acceleration caused by any object when placed on the surface on the Earth due to its weight.
The acceleration due to gravity is related to the distance as
g =GM/R²
where G is the gravitational constant = 6.67 x 10⁻¹¹ N.m²/kg²
Given is the height R = 7 x 6.4 x 10⁶ m and mass of Earth M = 6 x 10²⁴ kg
Substitute the values into the expression to find the acceleration due to gravity.
g = ( 6.67 x 10⁻¹¹ x 6 x 10²⁴)/ ( 7 x 6.4 x 10⁶)²
g = 8.933 m/s²
Thus, the acceleration due to gravity g at height 7 times the radius of Earth above the surface of the Earth is 8.933 m/s².
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How many kg of ice at 0°C must be added to 0.6kg of water at 100°C in an insulated 0.1kg copper container and its contents to 30°C? The specific heats of water and copper are 4.2 and 0.39 kJ/kgK, respectively; the heat of fusion of ice is 335 kJ/kg.
Answer:
.389 kg of ice required
Explanation:
The heat absorbed by melting the ice and warming it to 30 C
must be equal to the heat lost by cooling the existing water and the copper from 100 to 30 C
First, melt the ice (this occurs at a constant temperature)
x * 335 kj/kg and warm this water x * 4.2 kj/kg-k * 30 k
(x = kg of ice required)
then cool the copper and the .6 kg water from 100 to 30 C (70 degrees)
.1 kg * .39 * 70 K + .6kg * 4.2 kj/kg-K * 70 K
then equate the two amounts of heat
x ( 335 + 4.2 *30) = .1 * .39 * 70 + .6 * 4.2 * 70
solve for x = .389 kg
In which 120-V light bulb does the filament have greater resistance: a 60-W bulb or a 120-W bulb?
Answer:
60W
Explanation:
A higher watt bulb allows more electricity through, therefore the resistance must be lower.
what are loops and its types
Answer:
A for loop is a loop that runs for a preset number of times. A while loop is a loop that is repeated as long as an expression is true. An expression is a statement that has value. A do while loop or repeat until loop repeats until an expression becomes false.
(100 POINTS AND BRAINLIEST)
Atoms form chemical bonds using:
a. electrons in the innermost energy level
b. electrons in the outermost energy level
c. protons and electrons
Answer:
electron in the outermost
Explanation:
These are the electrons available for bonding or transfer
protons do are not involved in actual bonding
Answer:
b
Explanation:
Atoms form chemical bonds using electrons in the outermost energy level, otherwise known as valence electrons.
For atoms to bond, they must either gain or lose electrons.
By gaining electrons, the atom attains a negative charge.
By losing electrons, the atom attains a positive charge.
A bug starts from point A, crawls 15cm due east, then 5cm due west, 7cm due south, 3.0cm due west and 5.0cm due north to point B. Calculate the north and east distance of point B from A
Answer:
let i represent due East and j due north
X (displacement) = (15 - 5) i - 7 j - 3 i + 5 j = 7 i - 2 j
Total displacement = (7^2 + 2^2)^1/2 = 7.28 vector displacement
tan θ = -2 / 7 = -15.9 deg or 15.9 deg S of E
note N distance was -2 cm
E distance was 7 cm
A 20 kg bike accelerates at 10 m/s2. what was the net force
Explanation:
Fnet = m.a
= (20)(10)
= 200N
The expression of x=4t+2t^2 Where x is distance and t=time What is displecement ?
Answer:
x = 4 t + 2 t^2
the displacement is x which is zero at t = 0 and then increases indefinitely as t increases indefinitely
A car accelerates at a rate of 8.8m/s² with a force from the tires of 19,976N. What is the mass of the car?
A.1800kg
B.2270kg
C.1360kg
D2140kg
Answer:
B. 2270 kg
Explanation:
We know that :
Force = Mass x AccelerationWe are given :
Force = 19,976 NAcceleration = 8.8 m/s²Finding mass
19,976 = 8.8 x massmass = 19,976/8.8mass = 2270 kgWhich diagram shows magnets aligned so they will attract each other?
A positive charge is fixed at point (−4,−3) and a negative charge − is fixed at point (−4,0). Determine the net electric force ⃗ net acting on a positive test charge + at the origin (0,0) in terms of the given quantities and physical constants, including the permittivity of free space 0. Express the force using unit vector notation. Enter precise fractions rather than entering their approximate numerical values.
The net electric force acting on a positive test charge at the origin is determined as ¹/₉(kq₁q₂).
Net electric force on the chargesThe net electric force on the charges is calculated as follows;
F = kq₁q₂/r²
where;
k is coulomb's constantq₁ and q₂ are the chargesr is the distance between the chargesDistance between the charges[tex]|r| = \sqrt{(x_2-x_1)^2+ (y_2-y_1)^2} \\\\|r| = \sqrt{(-4--4)^2+ (0--3)^2} \\\\|r| = \sqrt{(0)^2 + (3)^2} \\\\|r| = 3 \ units[/tex]
[tex]F_{net} = \frac{kq_1q_2}{3^2} \\\\F_{net} = \frac{1}{9} (kq_1q_2) , \ N[/tex]
Thus, the net electric force acting on a positive test charge at the origin is determined as ¹/₉(kq₁q₂).
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Mars had a mass of 6.38* 10^23 kg and a radius of 3,390,000meter what is the force of gravity experienced by a mars rover with a mass of 3.7 kg playing in the Martian surface
I hope its helps you . you can also write 1.44×10^3 it will be better
what is the distance of a car travels is its velocity is 30 mph and its time is 2 hours ?
Answer:
distance = 60 miles
Explanation:
A model airplane heads due east at 1.50 meters per second, while the wind blows due north at 0.70 meter per second. The scaled diagram below represents these vector quantities.
A)1.7m/s
B)1.7m/s^2
C)2.2m/s
D)2.2m/s²
The resultant physical quantity, velocity is 1.7 m/s. The correct option is A.
What is triangle law of vector addition?When two vectors are represented by vectors, their resultant will be the closing side of the triangle.
A model airplane heads due east at 1.50 meters per second, while the wind blows due north at 0.70 meter per second.
The right angle triangle is formed from the two velocity vectors and its resultant will be its hypotenuse.
Then, from the Pythagoras theorem,
Vr ² = (0.70)² + (1.50)²
Vr = 1.65 m/s
Thus, the resultant velocity is approximately 1.7 m/s.
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Calculate the Speed for A + B
Answer:
Speed of A + B = 1 m/s
Explanation:
The speed of B = 0 because the distance does not change with time .
The speed of A = 1 m/s ( the slope of the line)
A roller coaster is moving at 10 m/s at the top of a hill and 22 m/s at the bottom of the hill two seconds later. What is the acceleration of the roller coaster?
Answer:
The acceleration is
Explanation:
Acceleration = final velocity - initial velocity
---------------------------------------
speed
Initial velocity = 10m/s
final velocity = 22m/s
speed = 2 secs
acceleration = 22 - 10
-----------
2
= 12/2
6 m/s^2
The speed of sound in air is 340 m/s. What is the wavelength of a soundwave that has a frequency of 977Hz?
Answer:
The wavelength is =2.87m.
Explanation:
The speed of sound, the frequency and the wavelength is related by the equation
v=fλ
speed of sound is v=340ms
frequency is f=977Hz
wavelength is λ= v/f = 977/340 =2.87m
Answer:
.348 meters
Explanation:
Speed = wavelength * frequency
340 = wl * 977
340 /977 = wavelength = .348 m
Which statements correctly describe the effect of distance in determining the gravitational force and the electrical
force? Check all that apply.
The gravitational force has an infinite reach.
The electrical force has an infinite reach.
The gravitational force is inversely proportional to the distance.
U The electrical force is inversely proportional to the distance.
O The gravitational force is inversely proportional to the square of the distance.
O The electrical force is inversely proportional to the square of the distance.
The statements 1,4 and 5 accurately describe the influence of distance on gravitational and electrical forces.
What is Newton's law of gravity?Newton's law of gravity states that each particle having mass in the universe attracts each other particle with a force known as the gravitational force.
Gravitational force is proportional to the product of the masses of the two bodies and inversely proportional to the square of their distance.
Decreasing the distance would increase the gravity of the planet.
The following statements accurately describe the influence of distance on gravitational and electrical forces.
1. The gravitational force has an infinite reach.
4. The gravitational force is inversely proportional to the square of the distance.
5. The electrical force is inversely proportional to the square of the distance.
Hence, options 1,4 and 5 are correct.
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Anujan and Piragavy are pulling on either side of a box with ropes. Anujan rope pulls with a force of 35 N [35° N of W], while Piragavy pulls with a force of 11 N [41° S of E]. There is a frictional force of 6 N [s] opposing the motion. Calculate the following: The Fnet and the acceleration of the object.
The net force on the block is 20.678 N. Force is defined as the product of mass and acceleration. Its unit is Newton.
What is force?Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.
Anujan rope pulls with a force of 35 N [35° N of W]. The force is resolved in x and y direction as;
[tex]\rm F_{1x}= 35 cos 35^0 \\\\ F_{1y}=35 sin 35^0[/tex]
Piragavy pulls with a force of 11 N [41° S of E]. The force is resolved in x and y direction as;
[tex]\rm F_{2x}= 11 cos 41^0 \\\\ F_{2y}=11 sin 41^0[/tex]
The net force on the block is;
[tex]\rm F_{net}=F_{1x}-F_{2x}\\\\\ F_{net}=35 \ cos 35^0- 11 \cos 41^0 \\\\ F_{net}=20.678 \ N[/tex]
Hence,the net force on the block is 20.678 N.
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12. Humans are considered the best endurance runners because of the body’s ideal method of cooling called _________________, which allows the body to release heat and therefore cool itself continuously.
Answer:
Sweating
Explanation:
Sweating allows the body to release heat, causing the body to cool itself.
a circuit has two 11.4 volts batteries and a bulb with a resistance of 18.7 ohms calculate the current flowing through the circuit
Each box contains information from two different ecosystems about a similar pattern of
interaction between two species that live in close association with each other.
Categorize the type of symbiotic relationships described in the boxed information.
Answer:
What is the interaction between two different species in an ecosystem called?
Interactions between different species in a community are called interspecific interactions—inter- means "between." Different types of interspecific interactions have different effects on the two participants, which may be positive (+), negative (-), or neutral (0).
Explanation:
Suppose you were to make a three-dimensional model of magnetic force
using magnetic field lines and a magnet. Which two characteristics might
your model have?
A. The field lines exist only at the top and the bottom of the magnet.
B. Arrows on the field lines point from the magnet's north pole to its
south pole.
C. The field lines near the magnet are far apart.
D. The field lines do not cross paths as they go from one pole of the
magnet to the other.
दा
Answer:
D. Po cguro pero I will study hard to get the correct answer and I will share to you pero I try mo Lang po Yan kac halos kami dito Yan po Yung nilagay namin na answer baka kac Tama po e Kaya tau mag aral po tau ng mabuti Para MAtopad natin Yung mga pangarap natin at making tau sa mga pamilya at guro Yung Lang po good bless
which of the following is a reality based condition with self-defeating patterns?
Answer:
What is a reality based condition with self-defeating patterns?
Terms in this set (35) A psychotic is reality based, yet needs psychotherapy to correct their values. A neurotic is a non-reality based person with self-defeating patterns of behavior.
Explanation:
A magnetic field of 0.0037 T is measured at a distance of 2 cm from a long
straight current carrying wire. What is the magnitude of the current flow in the
wire?
Hi there!
We can use Ampère's Law to derive an expression for the magnetic field strength produced by an infinitely long current-carrying wire:
[tex]\oint B \cdot dl = \mu_0 I_{encl}[/tex]
B = Magnetic Field Strength (T)
dl = Differential length along path
μ₀ = Permeability of Free Space (Tm/A)
I = Enclosed current (A)
The integral is a cross product, so the cosine of the angle between the magnetic field and the path of integration is used. However, for a straight current-carrying wire, the path is ALWAYS parallel to the magnetic field, so since cos(180) = 1, we can disregard the cross product.
Additionally, the path of integration is equivalent to:
[tex]l = 2\pi r[/tex]
[tex]B \cdot l = \mu_0 I_{encl}\\\\B * 2\pi r = \mu_0 I_{encl}\\\\B = \frac{\mu_0 I_{encl}}{2\pi r }[/tex]
Rearrange to solve for enclosed current:
[tex]I_{encl} = \frac{2\pi rB}{\mu_0} = \frac{2\pi (0.02)(0.0037)}{(4\pi *10^{-7})} = \boxed{370 A}[/tex]
5. How far can a car travel in 14 hours while going at a speed of 75 miles per hour?
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Here we go ~
Speed of the car is 75 miles per hour and it travels for 14 hours. so the distance travelled by it in the given period of time can be calculated using this formula ~
[tex]\qquad \sf \dashrightarrow \: d = v \sdot t[/tex]
[tex]\qquad \sf \dashrightarrow \: d = 75 \times 14[/tex]
[tex]\qquad \sf \dashrightarrow \: d = 1050 \: \: miles[/tex]
so, it can travel 1050 miles in 14 hours
Answer:
1050 miles
Explanation:
Simply:
d = 75 m/hr * 14 hr =1050 miles
( see how the 'hr' cancels and you are left with miles ?)
What type of bond is most likely to form between two gold (Au) atoms?
Answer:
I believe it would be a metallic bond.
Explanation:
Explain this picture in terms of potential and kinetic energy.
PLEASE HELP ASAP!
Water flowing through a garden hose of diameter 2.74 cm fills a 25.0-liter bucket in 2.50 min. What is the volumetric flow rate?
If the number of turns in a primary coil is 200 and the voltage is 120 V, then how many turns are needed in a secondary coil of a transformer to produce an output voltage of 24,000 V?
Np/Ns = Vp/Vs
200/Ns=120/24000
Ns=40,000
Which of the following is an example of in-group bias? A. Avery, who loves to go to car shows B. Shelly, who thinks her cheerleading team is better than any other school's team C. Zoe, who likes to shop more than anything else D. Matt, who loves to watch his favorite team play football
Answer:
B because since SHE is in the team she is in group and it is bias because she treats the other teams as competition. Hope this helps!
Explanation: