A 2.0 kg box is pulled along a frictionless, horizontal surface by a force that makes an angle of 30 degrees with the ground. If the box is pulled a distance of 4.0 meters and changes speed from 1.0 m/s to 3 m/s, what was the magnitude of the force on the box?
Answer:
2 N
Explanation:
v = Final velocity = 3 m/s
u = Initial velocity = 1 m/s
s = Displacement = 4 m
m = Mass of box = 2 kg
Acceleration of the box is
[tex]v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{3^2-1^2}{2\times 4}\\\Rightarrow a=1\ \text{m/s}^2[/tex]
Force is given by
[tex]F=ma\\\Rightarrow F=2\times 1\\\Rightarrow F=2\ \text{N}[/tex]
The force on the box is 2 N.
Why does the comet have tails
Answer:
Comets leave long beautiful tails when they come close to the sun. ... But when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and microparticles (electrons and ions). These materials form a tail whose flow is affected by the sun's radiation pressure.
Explanation: I just searched it up on the internet lol.
Answer:
when it approaches the sun, the heat evaporates the comet's gases, causing it to emit dust and micro particles
Explanation:
:)
Between which two atoms of water are hydrogen bonds are formed?
A. between the hydrogen atom of one water molecule and the oxygen atom of another
B. between the hydrogen atoms of two water molecules
C. between the oxygen atoms of two water molecules
Which of the following materials is a mixture? A. water B. table salt C. seawater D.iron filings
Answer:
eu acho que ê a B
uma bela noite abençoada
Answer:
The answer is "B" table salt
Good look
Explanation:
Cuanta fuerza se necesita lara evitar que una piedra de 20N caiga?
Answer:
Reaction is 20N.
Explanation:
In general, Newton's third law of motion explains that when a force is applied on an object, a reaction of equal magnitude applies in the reverse direction of the force.
i.e F = -R
This implies that, reaction is a force in the opposite direction to that of the force applied.
Force can also be related to the weight of an object as;
F = W = mg
Thus to prevent the 20N stone from falling, a force of 20N is applied in the opposite direction. So the reaction, R is 20N.
1. how Orienteering is an ideal sport for the most promotion of
physical activity and lifetime sports.
Answer:
Because it comprises both physical and mental activities.
Explanation:
Orienteering is a sport that is known for its physical and mental activities. It is an ideal sport for the most promotion of physical activity and lifetime sports because it involves moving through the wild or difficult terrain. This takes energy to be competitive, and it also requires participants to take challenging decisions now and then.
People of different ages can participate and allows them to apply real-world decision-making skills to the competition. It also gives participants the chance to learn about themselves more and how to face different situations.
A skater increases her velocity from 2.0 m/sec to 10.0 m/sec in 3.0 sec. what is the acceleration of the skater
Final speed 10.0 rn/s Change in time = 3 seconds The acceleration of the skater is 2.7 meters per second Relationship per second. 3.
What is the average speed of the Earth after one orbit if it travels 585.6 million miles in 12 months?
Answer:
Forty-eight million eight hundred thousand
Explanation:
You divide 585.6/12. I really hope this helps!!
A 5.00 kg firecracker explodes into two parts: one part has a
mass of 3.00 kg and moves at a velocity of 25.0 m/s towards
the west. The other part has a mass of 2.00 kg. What is the
velocity of the second piece as a result of the explosion?
a -28.7 m/s
b 15.8 m/s
C-37.5 m/s
d 43.2 m/s
Answer:-37.5 m/s
Explanation:
Answer:
-37.5
Explanation:
Determine the gravitational energy of your 2 kg physics binder if it is sitting on the ground (height= 0
meters)
Answer:
0J
Explanation:
The gravitational potential energy of the body is 0J because the height is at 0m.
Gravitational potential energy is a form of energy which is highly dependent on the position of a body. The relative position of a body in space accounts for the amount of gravitational potential energy they posses.
A body at height 0m has no gravitational potential energy:Gravitational potential energy = mgh
m is the mass of the body
g is the acceleration due to gravity
h is the height
So, if h = 0, Gravitational potential energy will become 0.
What is the first step when adding two vectors that are not perpendicular?
Answer:
Two non-perpendicular vectors will not form a right triangle. Yet it is possible to force two (or more) non-perpendicular vectors to be transformed into other vectors that do form a right triangle. The trick involves the concept of a vector component and the process of vector resolution.
A cheetah and a gazelle are grazing in the savannah. The gazelle is 275 meters away from the gazelle safe zone and the cheetah is 455 meters away. If the gazelle can run at 25 m/s and the cheetah can run at 65 m/s will the gazelle get to safety? If not how fast does the gazelle need to run to beat the cheetah by 2 seconds? I
Answer:
1) Yes, the gazelle gets to safety
2) The speed with which the gazelle needs to run, to beat the cheater by 2 seconds is approximately 29.79 m/s
Explanation:
1) The distance of the gazelle, from the gazelle safe zone = 275 m
The distance of the cheetah from the gazelle = 455 m
The speed of the gazelle = 25 m/s
The speed of the cheetah = 65 m/s
Therefore, we have;
Let the time the gazelle reaches the safe zone = t, which gives;
t = 275 m/(25 m/s) = 11
t = 11 seconds
Let the time the cheetah reaches the gazelle = t₁, we have;
455 + 25 × t₁ = 65 × t₁
t₁ = 455/40 = 11.375
t₁ = 11.375 seconds
The gazelle reaches the gazelle safe zone before the cheetah reaches the gazelle
Therefore, the gazelle gets to safety
2) In order for the gazelle to beat the gazelle by 2 seconds, we have;
The time for the cheetah to reach the safe zone = (275 + 455)/65 = 11.23 seconds
Therefore, we have;
In order for the gazelle to beat the gazelle by 2 seconds the time the cheetah reaches the safe zone = 11.23 - 2 = 9.23 s
The speed of the gazelle is then 275/9.23 ≈ 29.79 m/s
Answer: d = r · t d + 300cheertah = 18t gazelle = 16t the running times are equal! (d + 300) / 18 = d / 16 Solve ford then determine time.
sorry if its confusing
Brian and Emily are testing different paper airplane designs to see which will allow a plane to travel the farthest distance. Emily folds her plane and attaches a paperclip to the front of it. After she throws the plane, it travels about fifty feet and then falls to the ground. Why does the plane eventually fall to the ground?
Halp meh pleaase
Answer:
The answer is "The gravity force is stronger than for the powers in the air".
Explanation:
Gravity is the fundamental attraction force which acts among all material. On Earth, each organ does have a weight, and decreasing force of gravity, it relative towards its weight imposed by the earth's mass. Force is measured mostly by acceleration it gives to artifacts that can drop, that's why the plane eventually falls to the ground.
The energy that is stored in
chemical composition of matter is....
a. Potential Energy
b. Elastic Enersy
c. Chemical Energy
d Mechaneal Energy
Answer:
C
Explanation:
Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place.
What type of modulation is typically used by broadcasting stations to transmit pictures on television screens?
O amplitude
O frequency
O phase
O pulse
Answer:
The correct option is;
Amplitude
Explanation:
When transmitting picture signals over the air by broadcasting stations, the signals are shifted into high frequency channels of Very High Frequency (VHF) or Ultra High Frequency (UHF) carrier currents and imposing the the television signal by changing the amplitude of the high frequency carrier current to match the transmitted television signal waveform shape
Matching vocabulary terms
Answer:
.
Explanation:
26 = Terminal Velocity
27 = Force
34 = Momentum
33 = Laws of Conversation of Momentum (I think)
Which of the following is NOT a type of electromagnetic wave?
Answer:
Sound waves
Explanation:
You should let someone else answer too though because I'm not 100% sure that's the correct answer.
this is my physical science homework on chemical equations please if you can answer them in order thank you!
Over 75 seconds a truck traveled at a constant velocity of 25 meters per second to the west. Find the trucks displacement
Answer:
1875 m west
Explanation:
Take east to be the positive direction. Given:
v₀ = -25 m/s
a = 0 m/s² (constant velocity)
t = 75 s
Find: Δx
Δx = v₀ t + ½ at²
Δx = (-25 m/s) (75 s) + ½ (0 m/s²) (75 s)²
Δx = -1875 m
After a wave passes through a medium, particles in the medium
Answer:
If a particle is affected by a wave, then the particles are displaced. They move along the direction of the wave. Hence, After a wave passes through a medium, particles in the medium are moved along with the wave.
Explanation:
hope this helps you
A wheel with radius r rotates freely about its axle with initial angular speed ωi. A point on the wheel's rim moves at linear speed v.
Suddenly, the wheel accelerates so the point moves at linear speed 3v. The final angular speed is ωf.
How does the angular speed of the wheel change?
Answer:
[tex]\dfrac{2\omega_i}{t}[/tex]
Explanation:
r = Radius of wheel
v = Initial linear speed
3v = Final linear speed
Initial angular speed is given by
[tex]\omega_i=\dfrac{v}{r}[/tex]
Final angular speed after time [tex]t[/tex] is given by
[tex]\omega_f=\dfrac{3v}{r}\\\Rightarrow \omega_f=3\dfrac{v}{r}=3\omega_i[/tex]
The angular acceleration of the wheel will give us how the angular speed of the wheel changes.
From the equations of rotational motion we have
[tex]\omega_f=\omega_i+\alpha t\\\Rightarrow 3\omega_i=\omega_i+\alpha t\\\Rightarrow \alpha=\dfrac{3\omega_i-\omega_i}{t}\\\Rightarrow \alpha=\dfrac{2\omega_i}{t}[/tex]
The acceleration wheel is [tex]\dfrac{2\omega_i}{t}[/tex].
Answer:increases by a factor of 3
Explanation: just trust me bro
A heavy box is pulled across a wooden floor with a rope. The rope forms an angle of
60 degrees with the floor. A tension of 80 N is maintained on the rope. What actually is
pulling the box across the floor?
Answer:
69.28N
Explanation:
horizontal force
Cos 60°= F(horizontal)/80N
If we cross multiply, we have
F(horizontal)= 80 cos 60°
= 40N
vertical forces
Sin 60°= F(vertical)/80N
If we cross multiply we have
F( vertical) = 80 sin 60°
= 69.28N
Therefore, the vertical force is 69.28N
A man exerts a force on a large couch by pushing on it. Which of the following must be a true statement about the couch after he begins pushing?
A. The couch will maintain a constant acceleration due to the man's push.
B. The couch will remain at rest.
C. The couch will remain at rest if the push does not overcome the force of friction.
D. The couch will accelerate and then remain at a constant velocity.
Answer: the answer is c
Explanation:
If an element forms a 3+ ion in which group of the periodic table would you expect to find it?
A. 15
B. 5
C. 13
D. 2
If an element forms a 3+ ion, one can expect to find it in group 13 of the periodic table (option C).
What is the periodic table?Periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).
The periodic table is made up of vertical columns called group and horizontal rows called periods.
Elements in group 13 form ions with +3 and +1 charges. The elements are as follows:
boron (B)aluminum (Al)gallium (Ga)indium (In)thallium (Tl)nihonium (Nh)Therefore, group 13 elements in the periodic table form +³ ions.
Learn more about periodic table at: https://brainly.com/question/11155928
#SPJ1
5. You require a high-current battery to start a large tractor. While shopping
for this battery, should you be more concerned with the battery's rating
of volts or amps? Explain.
Answer:
I have no clue sorry I wish I could help
1. Isotopes have a different nubmer of neutrons in the nucleus. These atoms would have different
as a result. *
A) identities
B) charges
C) atomic numbers
D) atomic masses
Answer:
i believe atomic mass
Explanation:
Rolling Balls LAB - ANSWER SHEET (45 pts)
QUESTIONS:
1. What is the formula for calculating speed? (1 pt)
2. If you were trying to determine if cars in your neighborhood were traveling at or below the posted speed limit, how would you do it? (2 pts)
3. Create a hypothesis as an if-then statement. (2 pts)
4-15. Fill in the Data Table for Balls #1 and #2 (2 pts per blank)
Ball #1 (Describe the ball) - ____________________________________________________
Trial Time to travel 2 meters (seconds)
1
2
3
Average Time
Using the formula s = d/t, calculate the average speed of Ball #1: _____________________
Ball #2 (Describe the ball) - ____________________________________________________
Trial Time to travel 2 meters (seconds)
1
2
3
Average Time
Using the formula s = d/t, calculate the average speed of Ball #2: _____________________
16. Based on your data, which ball was the fastest? (1 pt)
17. Why do you think it was the fastest? (2 pts)
18. Was your hypothesis correct? (1 pt)
19. Do you think size of the ball had anything to do with the speed of the ball? (2 pts)
20. Why or why not? (2 pts)
21. Name 2 factors that could determine the speed at which a ball rolls. (2 pts)
22. A car travels 3 kilometers and it takes 2 minutes to cover that distance What is the speed of the car? (2 pts)
23. A train is traveling at 60 km/hr. It travels for 2 hours. How far will it travel? (2 pts)
24. A girl is riding her bicycle at 10 miles/hour. At the end of the ride she has traveled 35 miles. How long did it take her to cover that distance? (2 pts)
Answer:
1. s = d/t
22. d = 3km = 3000m
t = 2m = 60s
s = 3000/60
= 300/6
= 50m/s
Therefore, the speed of the car is 50 m/s.
23. s = 60km/hr
t = 2hrs
d = s × t
d = 60 × 2
d = 120km
The car travels for 120km.
24. s = 10mile/hr
d = 35km
t = d/s
t = 35/10
t = 3.5hrs
The girl takes 3.5 hours to cover the distance
what is energy?
a. the number of atoms in an object
b. a form of sound
c. the ability to do work
d. the size of an object
(ik its not b or d, but i dont know)
Answer:
c
Explanation:
c. the ability to do work or to produce heat
Sabiendo que el indice de refracción dela gua es 1,33 calcula el ángulo de refracción resultante para un rayo de luz que incide sobre una piscina con un ángulo de incidencia de 50º
Answer:
35.16 degrees
Explanation:
Knowing that the index of refraction of the guide is 1.33, calculate the resulting angle of refraction for a ray of light that falls on a pool with an angle of incidence of 50º
Refractive index, n = 1.33
The angle of incidence, i = 50°
We need to find the angle of refraction. let it is r. It can be calculated using Snells law as follows:
[tex]n=\dfrac{\sin i}{\sin r}\\\\\sin r=\dfrac{\sin i}{n}\\\\r=\sin^{-1}(\dfrac{\sin i}{n})\\\\r=\sin^{-1}(\dfrac{\sin 50}{1.33})\\\\r=35.16^{\circ}[/tex]
So, the angle of refraction is 35.16 degrees.
3. Why does any bonding occur (this includes ionic bonding and covalent bonding)?
A.to avoid nuclear decay
B.to decrease stability
C.to increase nuclear decay
.
D.to increase stability
Answer:im not sure but hope this helps
Explanation:
Covalent bonds are formed because of sharing electrons whereas ionic bonds formation occurs because of transferring of electrons. Molecules are the particles in covalent bonds all through compound formation whereas in ionic bonds these are positively charged and negatively charged ions.