Answer:
V = f λ speed of wave in terms of frequency and wavelength
t = S / V time for wave to travel a distance S
t = 91.4 m / 344.5 m/s = .265 sec time to travel 91.4 m
While unearthing ancient pottery in the gobi desert, an archaeologist discovers a pot containing a large amount of naturally radioactive americium-241, which experiences alpha decay.
the archaeologist needs to protect himself, but also doesn't want to overheat in the desert sun. in addition to a facemask, what is the most appropriate safety precaution that the archaeologist should take to protect against the alpha particles without overheating?
The most appropriate safety precaution that the archaeologist should take to protect against the alpha particles without overheating by wear a pair of normal leather gloves. Option D is correct.
What is radioactivity?
The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that want to give up some energy in order to move to a more stable form.
Radiation is being employed to assist humanity in medical, academia, and industry, as well as to generate power.
Radiation is also important in agriculture, archaeology, space exploration, law enforcement, geology a variety of other fields.
The most appropriate safety precaution that the archaeologist should take to protect against the alpha particles without overheating by wear a pair of normal leather gloves.
Hence, option D is correct.
To learn more about the radioactivity, refer to the link;
brainly.com/question/1770619
#SPJ1
Equipment used to measure the volume of the brass pieces
I believe a scale is good
A crowbar moves a distance of .35 meter to lift a load .05 meters off the ground.
what is the ideal mechanical advantage of the crowbar?
The ideal mechanical advantage of the crowbar will be 0.7.IMA is also equal to the distance traveled by the load divided by the distance traveled by the effort.
What is ideal mechanical advantage?The ideal mechanical advantage of a lever is equal to the length of the effort arm divided by the length of the resistance arm.
The ideal mechanical advantage is found as;
[tex]\rm IMA=\frac{0.35}{0.5} \\\\ IMA=0.7[/tex]
Hence,the ideal mechanical advantage of the crowbar will be 0.7.
To learn more about ideal mechanical advantage, refer:
https://brainly.com/question/6968974
#SPJ1
Select the correct answer from each drop-down menu. a tourist bus is carrying passengers from the bottom of a hill to the top. the people, the bus, and the luggage can be analyzed as a single . the total amount of energy in the system as the bus travels. this situation happens because some of the kinetic energy changes to energy because of friction between the tires and the road.
The correct answer from each drop-down menu are in this case:
systemdecreasesthermalWhat are the forms of energy conservation?In a given mechanical system, in which forms of energy related to electromagnetic or thermal phenomena are not present, it can be said that the total energy of the system is purely mechanical. Thus, the Principle of Conservation of Energy implies the conservation of mechanical energy.
This, in turn, is the sum of the amounts of kinetic energy and various forms of potential energy (gravitational and elastic among them). Although mechanical energy is always constant, the amount of each of its components can change such that the total energy remains constant.
See more about energy conservaion at brainly.com/question/1932868
#SPJ4
Why do the north and south poles of these magnets attract each other?
Answer:
here
Explanation:
Unlike-poles attract: When a north pole and south pole point together, the arrows point in the SAME direction so the field lines can join up and the magnets pull together (attract).
a car, moving at 30 m/s toward you, blows its horn at 500 Hz. if you are standing stil what frequency do you hear?
Answer:
If the engine is making sound, then the passer (like you) will be dead
ANYWAYS
but if it was silent you can hear it softly because since speed of light (the car) is lower than the speed of sound ( horn )
Explanation:
since the car is going in Miles per second if you convert it to Speed of sound that is what is equals to
c=√K^s / ρ
In a nuclear reactor a moderator is used to
Answer: A material called moderator is used to slow down the neutrons released during nuclear fission. The source's neutrons have a high speed and energy. The neutrons' speed is slowed by heavy water or graphite moderators.
Explanation:
Write the relation between mass and weight of a body
Answer:
[tex]\text{Weight} = \text{Mass} \times \text{Gravitational acceleration}[/tex]
Explanation:
A falling flowerpot has a mass of 5 kg. After falling for one second, it has a speed of 10 m/s. What is its kinetic energy?
KE = 1/2mv²
KE = 1/2 x 5 x (10²)
KE = 250 J
Which of the following is LEAST likely to be the result of a genetic mutation?
A
A horse with a particularly long neck
B
A man with a beard
С
An albino squirrel
D
A plant that produces fewer seeds than normal
Answer:
B. man with a beard
Explanation:
it is not a genetic mutation because it is completely natural and common unlike the other options.
What observational fact convinces astronomers that the source of energy in a typical quasar is physically very small?.
Answer:
An extreme redshift of emission lines that indicated high recessional
a.5 kg model rocket launches with a thrust of 5 n in the upward direction. can it lift off of the ground? (hint: gravity is pulling it toward
the earth at 9.8 m/s2) (f=mx a) assume there is no wind resistance.
Answer:
F = F2 - F1 where F is the net force upwards
F = 5 - (.5 * 9.8) = (5 - 4.9) N = .1 N
Since there is a net force in the upwards direction the rocket should experience an upwards acceleration.
What is the water division of earth
Answers:
Ocean water 1% freshwater frozen as ice 90% and freshwater9%
Ocean water 47% freshwater 50% and freshwater frozen as ice 3%
Ocean water 97.5% Freshwater frozen as ice 1.5% and freshwater 1%
Ocean water 33.33% freshwater frozen as ice 33.33% and Ocean water 33.33%
Answer:
the third option
Explanation:
Answer:
Ocean water 97.5% Freshwater frozen as ice 1.5% and freshwater 1%
Explanation:
what is weight?how can we measure it
Answer:weight is a vector.
Explanation: It is measured in Newtons (N) and has direction
Answer:
total gravity of mass on earth. it can measured by Newton
Explanation:
I think it will help you. follow me ok .
Which statement describes the differences between nuclear reactions and chemical reactions?
Nuclear reactions involve changes to electrons, while chemical reactions involve changes to protons and neutrons.
Only chemical reactions can be exothermic.
Chemical reactions can result in new compounds, while nuclear reactions can result in new elements.
Answer:
c on ed
Explanation:
pls complete this table thankyou
Answer:
1)10 m/s
2) 20 m/s
3) 2 s
4) 500 m
5)1000 km/h
Average speed = distance travelled / time.
( note: distance must be in (m) and time in sec, if not then you convert ).
1) average speed = 20/2 = 10mls.
2) average speed = 100/5 = 20 m/s.
3) since we aren't given (time) let's call it x
so we replace the unknown time with x..
average speed = 2/x = 1
then cross multiply
you get x (the unknown time) as 2s {seconds}.
(to check if it's correct just add the time we got back into the equation and see if you would get a erage speed as 1m/s).
4) do the same, replace distance as x or any letter you want )
average speed = x/ 10 = 50
cross multiply
you get x = 500m {meters}
5) (we need to convert km to meters and time to secs because that's what we are working with).
200km = 200,000 m { to convert to meters you multiply the given by 1000, 1km = 1000m).
for 2h, we know that:
60 seconds makes 1 minute
60 minutes makes an hour.
so we multiply 60 by 60 we get 3600mins then we multiply it by 2 to get 7200 secs
so now
Average speed = 200,000/7200 = 27.77 m/s.
Here you go..
hope this helps
Good luck and ace that test.
NAME:
A room has a 60 Watt, a 100 Watt and a 150 Watt light bulb. How much does it
cost to use all the lamps for 2.5 hours at $0.08/ kWh?
E-60
Answer:
$ .0248 or 2.48 cents
Explanation:
60 + 100 + 150 = 310 watts
for one hour = 310 watt- hr or .31 kw- hr
.31 kw-hr * .08 / kw-hr = .0248
The SI unit for pressure is pascal (Pa). One hectopascal would equal how many pascals? 0. 1 Pa 10 Pa 100 Pa 1000 Pa.
Answer:
100 Pa
Explanation:
"Hecto" prefix is given when a physical quantity generally 100 times the amount of the unit.
1 Pa x 100100 PaQuestion 12 (True/Faise Worth 5 points)
The presence of free electrons makes a material a good insulator.
O True
O False
write at least five electrical safety rules
a equals thirty five thats why the elephant strted to kiss the cat and the cat went upsidedown and started crying all over the ceiling
A 2.2kg mass is at the origin. A 4.66kg mass is 3m to its right, and another 4.66kg mass is 3 m to its left. What is the net gravitational force on the 2.2kg mass?
Answer:
zero
Explanation:
The gravitational force between two masses is jointly proportional to the masses and inversely proportional to the square of the distance between them. The constant of proportionality is the universal gravitational constant.
__
In this scenario, the force to the right is matched by an identical force to the left from an identical mass at an identical distance. The magnitudes of the forces are equal, and their directions are opposite. The forces cancel.
The net force on the 2.2 kg mass in the center is zero.
Whats the difference between a lunar and solar eclipse?.
Answer: there is no shadow on the Moon with the solar eclipse.
Explanation: When the Moon passes between the Earth and the Sun, it casts a moving shadow on the Earth's surface, known as a solar eclipse. When the Earth passes between the Sun and the Moon, a lunar eclipse occurs, creating a shadow on the Moon.
1.
Why does a balloon rubbed on your hair stick to the ceiling? What is this called? Why
does the balloon stay there?
Answer:
Static Electricity.
Explanation:
The rubbing of hair (object) onto the balloon creates a negative charge that is carried by electrons, the electrons will soon build higher to create static electricity, thus keeping it onto the ceiling.
Hope this helps!
When a car moves up a hill with constant
speed, it
A gains both kinetic energy and potential
energy
B
gains both kinetic energy but loses potential
energy
C gains potential energy and no change in
kinetic energy
D
neither gains nor loses potential energy or
kinetic energy
A sample contains 16 g of a radioactive isotope. how much radioactive
isotope remains in the sample after 1 half-life?
After one half-life, 8 g of radioactive isotope will remain in the sample.
What is radioactivity?The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that want to give up some energy in order to move to a more stable form.
The following formula is used to compute the number of half lives elapsed:
[tex]\rm N=\frac{N_0}{2^n} \\\\ N=\frac{16}{2} \\\\ N= 8 \ gram[/tex]
Hence,8 gram of radioactive isotope remains in the sample after 1 half-life.
To learn more about the radioactivity, refer to the link;
brainly.com/question/1770619
#SPJ1
Answer:
Answer is below
Explanation:
8 g
An ideal pendulum is often discussed when studying simple harmonic motion. what are the conditions needed for an ideal pendulum? check all that apply. gravitational force acts to pull the pendulum’s mass down. the mass of the rod of the pendulum is evenly distributed along the rod. the pivot on which the pendulum swings is frictionless. the pendulum swings through its equilibrium position as a result of inertia. tension acts downward on the pendulum’s mass.
The conditions needed for an ideal pendulum are;
The mass of the rod of the pendulum is evenly distributed along the rod. The pivot on which the pendulum swings is frictionless. The pendulum swings through its equilibrium position as a result of inertiaWhat is an ideal pendulum?An ideal pendulum is a type of pendulum that satisfies the following conditions,
The mass of the pendulum rod should be evenly distributed throughout the rod.The pendulum must move in a frictionless medium.The pendulum must move from the equilibrium position.Thus, the correct statements are second, third and the fourth.
Learn more about ideal pendulum here: https://brainly.com/question/3868789
#SPJ4
Answer:
b, c and d are correct ;)
Explanation:
Explain how nuclear physics works?
Answer:
Nuclear physics are the study of protons, and neutrons at the center of an atom. This study shows the interactions between atoms, including what holds them together in a small space. Nuclear physics include fission, fusion, and decay.
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
See below ~
Explanation:
Sun - provides energy that drives the cycleprecipitation - water falling from the skyrunoff - water moving across impervious surfacesseepage - water soaking into the groundevaporation - liquid water becoming a vapor to return to the atmospherecondensation - water vapor returning to liquid formThe answers are
Sun
Provides energy that drives the circle.precipitation
water falling from skyrun off
Water moving across impervious surfacesevaporation
Liquid water becomes vapour to return to the atmosphereseapage
water soaking into the groundcondensation
water vapour returning to liquid form12. A child touches the metal leg of a chair. She says "The
cold is moving to my hand!" How would you (gently) correct
the child in physics terms
A child touches the metal leg of a chair. The temperature of metal leg is moving to her hand.
What is temperature?The temperature is the degree of hotness or coldness when an object is touched.
The metals are generally have less temperature compared to the surrounding temperature. When a child touches the leg of a metal chair, she feel cold, but the physical term is temperature which is moved to her hand.
Thus, temperature of metal leg is moving to her hand.
Learn more about temperature.
https://brainly.com/question/11464844
#SPJ1
aristotle classified animals on the basis of?
Answer:
Aristotle classified animals on the basis of habitat.
Explanation:
Hope it helps you :)))))
have a good day