You throw a basketball from a cliff to the ground. The ball has an initial velocity of 12 m/s in the horizontal direction. After 3.0 seconds, the ball has a velocity of -30.0 m/s in the y-direction.
What is the direction of motion of the ball at time t= 3.0 s? (Hint: direction is related to the angle).
Answer:
The direction of motion of the ball is approximately 68.199º below the +x semiaxis.
Explanation:
The ball has a two-dimension motion, to be exact, a parabolical motion, that is, a motion at constant velocity in the x-direction and free fall motion in the y-motion. Hence, the horizontal velocity of the basketball is 12 meters per second and its direction ([tex]\theta[/tex]), in sexagesimal degrees, is calculated by this trigonometrical expression:
[tex]\theta = \tan^{-1} \frac{v_{y}}{v_{x}}[/tex] (1)
Where:
[tex]v_{x}[/tex] - Horizontal velocity, in meters per second.
[tex]v_{y}[/tex] - Vertical velocity, in meters per second.
If we know that [tex]v_{x} = 12\,\frac{m}{s}[/tex] and [tex]v_{y} = -30\,\frac{m}{s}[/tex], then the direction of motion of the ball is:
[tex]\theta \approx 68.199^{\circ}[/tex] (below the +x semiaxis)
The direction of motion of the ball is approximately 68.199º below the +x semiaxis.
which term describes the wave phenomenon in the image
Answer: (Next time put the Image but I know what u talkin bout)
wave changes its path from its initial direction so this phenomenon is known as Refraction of wave
Explanation:
When wave travels from one medium to other medium the due to change in the speed of the wave propagation it deviates from its initial path.
The deviation of the wave from its initial path is known as refraction of wave
Here we can see that wave incident on medium 1 with some angle with the boundary
Then it enters into other medium and then travels in other direction
So here wave changes its path from its initial direction so this phenomenon is known as Refraction of wave
Momentum is mass times velocity, so another way to think of momentum is ____ in motion.
inertia
weight
acceleration
velocity
Answer:
Acceleration
Explanation:
Momentum is acceleration because acceleration is movement and momentum is movement.
Momentun = Movement
Acceleration = Movement
Momentum = Acceleration
Calculate the amount of heat needed to convert 0.8 kg of ice at -19 °C into water at 29 °C.
Newton's first law states that objects do not change their velocity unless acted upon
by an outside force. When throwing a ball the ball initially accelerates from the force
provided by your arm and then begins to slow down.
What force(s) are responsible for the deceleration of the ball?
Answer:
Air resistance/Drag (this is the proper term for air resistance) or gravity or friction
It depends on the direction and if you throw it across a surface or if you throw it straight upwards.
I hope this helps!!
Answer:
Newton's first law: An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.
Explanation:
Brainliest for correct answer :)
Un tren emite un sonido a 480hz determina la frecuencia que percibe el observador cuando el observador se aleja a 12m/s del tren que ha quedado en reposo velocidad del sonido en el aire 340m/s
Answer:
La frecuencia que percibe el observador es 463 Hz.
Explanation:
El efecto Doppler se define como el cambio de frecuencia aparente de una onda producida por el movimiento relativo de la fuente respecto a su observador. En otras palabras, este efecto es el cambio en la frecuencia percibida de cualquier movimiento ondulatorio cuando el emisor y el receptor, u observador, se desplazan uno respecto a otro.
La siguiente expresión se considera el caso general del efecto Doppler:
[tex]f'=f*\frac{v+-vR}{v-+vE}[/tex]
Donde:
f’, f: Frecuencia percibida por el receptor y frecuencia emitida por el emisor respectivamente. Su unidad de medida en el Sistema Internacional (S.I.) es el Hertz (Hz), que es la unidad inversa del segundo (1 Hz = 1 s-1) v: Velocidad de propagación de la onda en el medio. Es constante y depende de las características del medio. En este caso se considera que la velocidad del sonido en el aire es de 340 m/s vR, vE: Velocidad del receptor y del emisor respectivamente. Su unidad de medida en el S.I. es el m/s ±, ∓:Utilizaremos el signo +:
En el numerador si el receptor se acerca al emisor
En el denominador si el emisor se aleja del receptor
Utilizaremos el signo -:
En el numerador si el receptor se aleja del emisor
En el denominador si el emisor se acerca al receptor
En este caso:
f= 480 Hzv= 340 m/svR= 12 m/s (el receptor es el observador)vE=0 (el emisor es el tren, que se encuentra en reposo)Y como el receptor se aleja del emisor, la expresión del efecto Doppler queda determinada como:
[tex]f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s-+0 m/s}[/tex]
Resolviendo se obtiene:
[tex]f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s}[/tex]
[tex]f'=480 Hz*\frac{328 m/s}{340 m/s}[/tex]
f'= 463 Hz
La frecuencia que percibe el observador es 463 Hz.
two uses of electricity
n the railroad accident, a boxcar weighting 200 kN and traveling at 3 m/s on horizontal track slams into a stationary caboose weighting 400 kN. The collision connects the caboose to the car, and then both move together and you have found the final velocity. Apparently, initial kinetic energy of the system changes (in part, because of friction present). How much energy (in kJ) is transferred from kinetic energy to other forms of energy (e..g., thermal) in the collision
Answer:
ΔK = -6 10⁴ J
Explanation:
This is a crash problem, let's start by defining a system formed by the two trucks, so that the forces during the crash have been internal and the moment is preserved
initial instant. Before the crash
p₀ = m v₁ + M 0
final instant. Right after the crash
p_f = (m + M) v
p₀ = p_f
mv₁ = (m + M) v
v = [tex]\frac{m}{m+M} \ v_1[/tex]
we substitute
v = [tex]\frac{20}{20+40}[/tex] 3
v = 1.0 m / s
having the initial and final velocities, let's find the kinetic energy
K₀ = ½ m v₁² + 0
K₀ = ½ 20 10³ 3²
K₀ = 9 10⁴ J
K_f = ½ (m + M) v²
K_f = ½ (20 +40) 10³ 1²
K_f = 3 10⁴ J
the change in energy is
ΔK = K_f - K₀
ΔK = (3 - 9) 10⁴
ΔK = -6 10⁴ J
The negative sign indicates that the energy is ranked in another type of energy
A bat with a mass of 0.35 kg travels at a rate of 15 m/s. What is the animal's momentum?
Answer:
momentum= mass x velocity = 0.35x15= 5.25kgm/s
What is a fact about incline planes?
Assignment: Can you identify various forces and instances in which electrostatic and magnetic forces occur
Answer:
Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. It is the basic force responsible for such effects as the action of electric motors and the attraction of magnets for iron. Electric forces exist among stationary electric charges; both electric and magnetic forces exist among moving electric charges. The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.
A glass window (n = 1.52) has a
uniform layer of ice on it (n = 1.31).
What is the critical angle for a ray
trying to pass from glass to ice?
(Water n = 1.33, Air n = 1.00)
(Unit = deg)
HELP PLSS!!
Answer: 59.5 deg
Explanation: In this problem, we are giving 1.31 as n2 and 1.52 as n1. Using the formula of critical angle= arcsine(n2/n1) we get the equation critical angle=arcsine(1.31/1.52) from there, you divide 1.31 by 1.52, and get 0.862.
On your calculator you then should press 2nd and then the sine button to get sine^-1 (arcsine) and in the parenthesis after arcsine put in 0.862, the answer you get will be 59.5.
True or False : 0°K=-273.15° C and 0°C (Celsius) = 273.150K
Answer:
TRUE
Explanation:
Please answer this so you get the brainlist
Answer: Potential Energy
Explanation:
This picture is potential energy as the boulder is not quite moving yet, although due to the hill the boulder has the Potential to move when it is pushed down the hill.
How many planets are there in our System? List them all.
Answer:
Eight planets.
1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune
Some people today claim the Earth is flat. Produce an argument to prove that the
Earth is not flat.
Answer:
i mean i think it is. we have no real pics of the earth they are all fake. And the moon landing was fake. the usa flag was blowing but there is no wind in space . its all fake
Explanation:
Una varilla efectúa 120 vibraciones durante un minuto. Hallar el período y la frecuencia del movimiento
What distance is moved if we have a 8N force and the work done is 90J
a = F/m is an explanation of
in  Physics
Answer:
The equation a=F/m or the acceleration is equal to the net force of an object divided by that object's mass, is an equation derived and explained by Sir Issac Newton's second law of motion. Newton's second law of motion states that the force of an object is equal to the mass times the acceleration of that object.
The 500 series bullet train travels between Tokyo and Hakata, Japan. If it is heading north with a momentum of 13,194,098.64 kg • m/s and at a velocity of 261.8 km/h, what is its mass?
Answer:
The mass of the 500 series bullet train is 181.4 tonnes.
Explanation:
The momentum is given by:
[tex] p = mv [/tex]
Where:
m: is the mass =?
v: is the velocity = 261.8 km/h
p: is the momentum = 13194098.64 kg*m/s
By solving the above equation for "m" we have:
[tex]m = \frac{p}{v} = \frac{13,194,098.64 kg*m/s}{261.8 km/h*\frac{1000 m}{1 km}*\frac{1 h}{3600 s}} = 181.4 tonnes[/tex]
Therefore, the mass of the 500 series bullet train is 181.4 tonnes.
I hope it helps you!
A neighborhood in a small Texas town had to be evacuated because the
houses were sinking due to a problem in the aquifer. What is the most
likely cause of this problem?
‼️‼️‼️ PLS HELP ‼️‼️‼️
Explanation:
Groundwater pumping and land subsidence because when compressing,squeezing or accompanying of soils in some aquifer systems can chaperon or accompanying an drastic groundwater pumping and it's far by the solitary largest caise of subsidence . Execissve pumping of such aquifer systems has ensue in permanent subsidence and regarding to ground obertion . hope that I helped you and good luck
A uniform electric field exists in a region between two oppositely charged plates. An electron is released from rest at the surface of the negatively charged plate and strikes the surface of the opposite plate, 2.0 cm away, in a time 1.5 x 10-8 s. The speed of the electron in millions m/sec as it strikes the second plate is: A. 13.3 B. 133 C. 2.67 D. 26.7 E. 534
Answer:
A. 13.3
Explanation:
First, we find the velocity of the electron in meters/sec, as follows:
[tex]v = \frac{d}{t}\\[/tex]
v = velocity of electron = ?
d = distance between plates = 2 cm = 0.02 m
t = time elapsed = 1.5 x 10⁻⁸ s
Therefore, using these values in the equation, we get:
[tex]v = \frac{0.02\ m}{1.5\ x\ 10^{-8}\ s}\\\\v = 1333333.33\ m/s[/tex]
Now, we convert this to million m/s:
[tex]v = (1333333.33\ m/s)\frac{1\ million\ m}{100000\ m}\\\\v =13.3\ million\ m/s[/tex]
Therefore, the correct answer is:
A. 13.3
A student pulls out his or her chair in order to sit down. The student pulls the chair 0.75 m with a force of 20 N. How much work does he or she do on the chair?
compute the velocity of an object orbiting at height 2Re above the surface of earth
Answer:
The orbital speed can be found using v = SQRT(G*M/R). The R value (radius of orbit) is the earth's radius plus the height above the earth - in this case, 6.59 x 106 m.
The velocity of an object orbiting at height 2Re above the surface of earth be 14380 m/s.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
The orbital velocity of an object orbiting around the Earth can be expressed as:
v = √(GM/R).
Where:
G = universal gravitational constant = 6.67408 × 10⁻¹¹N m² kg⁻².
M = mass of Earth = 5.97219 × 10²⁴ kilograms.
R = distance between the object and the center of Earth.
According to the question, the object orbiting at height 2[tex]R_e[/tex] above the surface of earth. So, distance between the object and the center of Earth is: R = radius of Earth + 2[tex]R_e[/tex]
= 3[tex]R_e[/tex]
= 3 × 6,371 km
= 1.9113 × 10⁶ m.
So, the velocity of the object : v = √(GM/R).
= √( 6.67408 × 10⁻¹¹× 5.97219 × 10²⁴/1.9113 × 10⁶ ) m/s
= 14380 m/s.
Hence, the velocity of the object be 14380 m/s.
Learn more about velocity here:
https://brainly.com/question/18084516
#SPJ2
Determine the momentum of a 13,000kg semi driving at 30 m/s
Answer:
390000
Explanation:
The momentum is huge. You wouldn't want this thing to hit you.
Momentum = m*v
m = 13000 kg
v = 30 m/s
Momentum = 13000 * 30
Momentum = 390000 kg m/s
It is common for creatures to be able to live in both the spray zone and low-tide zone.
True or False
Hii!!! The correct answer is true. (:
What is the relationship between retar ding potential and the kinetic energy of the emitted photoelectrons?
Answer:
The kinetic energy of photoelectrons at the surface grows linearly with the increasing frequency of incident radiation. Measurements for all metal surfaces give linear plots with one slope.
HELP YALL!!
Which nucleus completes the following equation?
Answer:
B
Explanation:
Chlorine institute
16+1=17
CI has 17 in the bottom.
Answer:C
Explanation:
rulers graduated in centimeters and inches are available in commerce. Determine the measurement in m of a 60 cm ruler can you help me
Answer:
0.6m
I hope this help a little bit.