An archer shoots an arrow 75 m distant target; the bull's-eye of the target is at the same height as the release height of the arrow. If d = 75 m and v = 37 m/s. At what angle must the arrow be released to hit the bull's-eye if its initial speed is 37 m/s?
Answer:
[tex]16.25^{\circ}[/tex]
Explanation:
R = Horizontal range of projectile = 75 m
v = Velocity of projectile = 37 m/s
g = Acceleration due to gravity = [tex]9.81\ \text{m/s}^2[/tex]
Horizontal range is given by
[tex]R=\dfrac{v^2\sin2\theta}{g}\\\Rightarrow \theta=\dfrac{\sin^{-1}\dfrac{Rg}{v^2}}{2}\\\Rightarrow \theta=\dfrac{\sin^{-1}\dfrac{75\times 9.81}{37^2}}{2}\\\Rightarrow \theta=16.25^{\circ}[/tex]
The angle at which the arrow is to be released is [tex]16.25^{\circ}[/tex].
list and describe the units of power
Answer:
On the other hand, power is a scalar quantity and is basically the amount of energy consumed per unit time which has no direction.
Horsepower HP 746 watts
Kilowatts kW 1×103W
Megawatts MW 1×106W
Gigawatts GW 1×109W
The S.I unit of power is Watt(W) which is joule per second.
A 10cm3 sample of copper has a density of 897g/cm3. What is the mass of the sample?
A 10cm³ sample of copper has a density of 897g/cm³. What is the mass of the sample ?
Answer:-Given:-Density of sample of copper is 897g/cm³.
Volume of sample of copper is 10cm³.
To Find:-The mass of the sample.
Solution:-We know,
[tex] { \boxed{\bf{\rm \red {Mass \: = \: Density \: × \: Volume}}}} [/tex]
So, Mass = 897g/cm³ × 10cm³
Mass = 8970 g
The mass of the sample is 8970 g. [Answer]The speed of light is 300,000,000 m/s. Red light has a wavelength of 0.0000007 m. What is its frequency?
Answer:
2.33..
Explanation:
f = wavelength/speed
= 0.0000007/300000000
= 2.333...
If a ball is lifted 2 meters off the ground and 5 Newtons of force were needed to move it,
what amount of work has been done? :3
Answer:
W = 98 J
Explanation:
Given hat,
Force, F = 5 N
It is lifted 2 m off the ground.
We need to find the amount of work done. We know that, the work done by an object is given by the product of force and displacement. So,
W = Fd
or
W = mgd
Put all the values,
W = 5 × 9.8 × 2
W = 98 J
So, the work done is equal to 98 J.
Which of the following is the combination that is used in the formation of achromatic lenses?
1 point
1 convex and 1 plane mirror
2 convex lenses
1 convex and 1 concave lens
2 concave lenses
Answer:
convex and 1 plane mirror
What two types of tactical communication vary based on whether or not you speak?
Answer:
If you don't have autism/deaf/anything like that you should be able to speak
Explanation:
Answer:
Verbal and nonverbal
Explanation:
Took the test
What will be the mass of a body at the center of the earth as compared to other places on
the earth?
Answer:
The mass of the object does not change by moving it to another place. ... At the center of the earth the net gravitational force is zero, so the weight will be zero, but its masses will remain same. Hence the mass at the centre of earth will be equl to 50 kg.
Explanation:
It's because the mass of the object doesn't change by moving it to next place.
What are the lower and upper fixed points of a laboratory thermometer in Celsius degrees?
The lower fixed point, or ice point, is the temperature of pure melting ice at normal atmospheric pressure. The upper fixed point, or steam point, is the temperature of pure boiling water at normal atmospheric pressure.
Which can cause physical weathering of rock?
A acid
B oxygen
C sun
D wind
Answer:
D wind
Explanation:
Heavy winds may cause much damage to the Earth along with rain and extreme temperature changes.
Someone please help me figure this out
Answer:
The third one is correst
what is the line that joins northen and southren hemisphere of the earth is called a
The line is called equator.
Derive formula of time period of S.H.M.
Answer:
it os shm and yea because of the smh
Explanation:
smh
Blue-ray disc accelerates from rest to a constant rotational speed of 466 rpm, it rotates through an angular displacement of 0.250 rev. What is the angular acceleration of the CD?
Answer:
[tex]\alpha =434312\ rev/s^2[/tex]
Explanation:
Given that,
Initial angular speed, [tex]\omega_i=0[/tex]
Final angular speed, [tex]\omega_f=466\ rpm[/tex]
Angular displacement, [tex]\theta=0.25\ rev[/tex]
We need to find the angular acceleration of the CD. Using third equation of rotational kinematics as follows :
[tex]\omega_f^2-\omega_i^2=2\alpha \theta\\\\\alpha =\dfrac{\omega_f^2-\omega_i^2}{2\theta}\\\\\alpha =\dfrac{466^2-0^2}{2\times 0.25}\\\\\alpha =434312\ rev/s^2[/tex]
So, the angular acceleration of the CD is equal to [tex]434312\ rev/s^2[/tex].
A 100 N force is applied to move an object a horizontal distance of 5 meters at constant speed in 10 seconds. How much power is done?
Answer:
50 W
Explanation:
Given :Force applied = 100 NDistance covered = 5 metresTime = 10 secondsTo find :
Power
Solution :For calculating power, we first need to know about the work done.
[tex] \bf \boxed{Work = Force \times displacement} [/tex]
Now, substituting values in the above formula;
Work = 100 × 5
= 500 Nm or 500 J
We know that,
[tex]\bf \boxed{Power=\dfrac{Work\:done}{Time\: taken}}[/tex]
Substituting values in above formula;
Power = 500/ 10
= 50 Nm/s or 50 W
Hence, power = 50 W .
The magnetic field of a bar magnet Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a Always points from north to south, whether we look outside the magnet or inside the magnet. b Always points from south to north, whether we look outside the magnet or inside the magnet. c Points from north to south outside the magnet, but south to north inside the magnet. d Points from south to north outside the magnet, but north to south inside the magnet.
Answer:
A: Always points from north to south, whether we look outside the magnet or inside the magnet
Explanation:
When we freely suspend a bar magnet, it's magnetic field will always rest in the north to south direction due to the fact that the Earth's magnetic south pole usually lies in the direction of the geographic north while the Earth's magnetic north pole usually lies in the direction of the geographic south.
Now, we all know that in magnets, like poles will repel and unlike poles will attract. What this now means is that the magnet will always point from the north to the south direction.
What do scientists use satellites for?
(there is no science colum)
Answer:
NASA satellites help scientists study Earth and space. Satellites looking toward Earth provide information about clouds, oceans, land and ice. They also measure gases in the atmosphere, such as ozone and carbon dioxide, and the amount of energy that Earth absorbs and emits. And satellites monitor wildfires, volcanoes and their smoke.
Explanation:
Hope this helps! :) have a great day.
1. GPS
2. Internet
3. Weather forecast
4. Observation
5. Experiments
6. Discovery
Amy pulls a spring with a spring constant k = 100 stretching it from its rest length of 0.10 m to 0.2
Answer:
Elastic potential energy E = 0.5 J
Explanation:
Let us assume we have to find the elastic potential energy stored in the spring.
Given: k = 100
change in the length of the spring x = 0.2-0.1 = 0.1 m
Elastic potential energy
E = [tex]\frac{1}{2} kx^2[/tex]
plugging the values we get
[tex]E = 0.5\times100\times0.1^2\\=0.5 J[/tex]
Hence, Elastic potential energy E = 0.5 J
Amy pulls a spring with a spring constant k = 100 N/m, stretching it from its rest length of 0.10 m to 0.20 m.
What is the elastic potential energy stored in the spring?
Answer: 0.5 J
NO LINKS PLEASE. brainly to the best answer.
Compare and contrast potential energy and kinetic energy
Answer:
Kinetic energy is energy possessed by a body by virtue of its movement. Potential energy is the energy possessed by a body by virtue of its position or state. While kinetic energy of an object is relative to the state of other objects in its environment, potential energy is completely independent of its environment.
Both energies are related to motion.
Explanation:
Which example is NOT a part of the electromagnetic spectrum?
Group of answer choices
electricity
microwaves
violet light
radio waves
How you work out efficiency?
Answer:
The work efficiency formula is efficiency = output / input, and you can multiply the result by 100 to get work efficiency as a percentage. This is used across different methods of measuring energy and work, whether it's energy production or machine efficiency.
Explanation:
Hope this helped!!!
A 30 kg box is pushed along a horizontal surface. The person pushing the box pushes with a constant force of 300 N directed at an angle of 30° below the horizontal. If the box starts from rest and reaches a speed of 5 m/s after only 2 seconds of pushing, find the force of friction acting on the box.
Answer:
aye son yall think if i keep answering these questions incorrectly.. they'll find out what im doing and take my li points back?
Explanation:
A double slit produces a diffraction pattern that is a combination of single and double slit interference. Find the ratio of the width of the slits to the separation between them, if the first minimum of the single slit pattern falls on the fifth maximum of the double slit pattern. (This will greatly reduce the intensity of the fifth maximum.)
Answer:
The ratio of the width of the slits to the separation between them is 1:5
Explanation:
For this set of question
n = 1, m = 5
As we know for nth minimum
[tex]D sin\theta =n \lambda[/tex]
For mth Maximum
[tex]d sin\theta =m \lambda[/tex]
From the above two equations we get
[tex]Sin\theta = \frac{1*\lambda}{D} \\d * \frac{1*\lambda}{D} = 5 *\lambda\\\frac{D}{d} = \frac{1}{5}[/tex]
The ratio of the width of the slits to the separation between them is 1:5
Scienctists agree that the world's climate is getting hotter. What do you think might happen as a result of this climate change?
Answer:
Bad things
Explanation:
Global warming has many terrible effects on people and the earth itself
such as, death, birth defects, asthmea, breathing conditions, increased diseases.
HELP ME PLEASEEEEEEEEEEEEEEE
Use the kinetic energy equation to explain why speed has a greater impact on kinetic energy than mass.
Answer:
KE = 1/2 M V^2 Equation to express kinetic energy
Since the result depends linearly on M and to the second power on V,
V has greater effect on the result.
Victor put a match on a balance and found that its mass was 6.0 grams. Then he lit the match and put it out after a few seconds.
He put the partially burned match on the balance again. This time, its mass was 4.5 grams.
Which of the following best explains what happened as the match burned?
A.
Some of the mass was destroyed by the fire.
B.
The matter moved to a different part of the match.
C.
Some of the matter changed from solid to gas and went into the air.
D.
The mass of the match combined with the mass of the fire.
Answer:
b
Explanation:
4. Un móvil viaja en línea recta con una velocidad media de 1200 cm/s durante 9 s, y luego con velocidad media de 480 cm/s durante 7 s, siendo ambas velocidades del mismo sentido: a) ¿cuál es el desplazamiento total en el viaje de 16 s? B) ¿cuál es la velocidad media del viaje completo?
Answer:
A) El desplazamiento total del viaje es 14160 centímetros.
B) La velocidad media del viaje completo es 885 centímetros por segundo.
Explanation:
A) El desplazamiento es el producto de la velocidad media por el tiempo. El desplazamiento total es la suma de desplazamientos asociados a cada velocidad media, entonces:
[tex]x = \left(1200\,\frac{cm}{s}\right)\cdot (9\,s)+ \left(480\,\frac{cm}{s} \right)\cdot (7\,s)[/tex]
[tex]x = 14160\,cm[/tex]
El desplazamiento total del viaje es 14160 centímetros.
B) La velocidad media del viaje es el desplazamiento total dividido por el tiempo total, es decir:
[tex]\bar v = \frac{14160\,cm }{16\,s}[/tex]
[tex]\bar v = 885\,\frac{cm}{s}[/tex]
La velocidad media del viaje completo es 885 centímetros por segundo.
Power is the rate at which...........is done or the rate at which........... is converted from one form to another .
Answer:
the answer is c I thought
A load uses a current of 5.0 A when it is attached to a 20 V source. What is the resistance of the load?
Answer: 4.0 ohm
Explanation:
Which scenario did not include a chemical change?
Answer:
what scenario i dont understand
Explanation:
step by step explenation