What term defines the specific amount of time required for half of a radioactive substance to become stable?a. half-life
b. decay phase
c. decay period
d. a gamma second

Answers

Answer 1

Answer: a would be the answer because thats how long it takes

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A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?
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A charged atom is called a(n) _____.

Big Al stands on a skateboard at a rest and throws a 0.5-kilogram rock at a velocity of 10.0 m /sec. Big Al moves back at 0.05 m/sec. What is the combined mass of Big Al and the skateboard?

Answers

let
his and skateboard's combined mass is x
we know
F1=-F2
0.5kg*10m/s=-0.05m/s xkg
5=0.05x(minus cancel with the m/s as it represented the opposite direction of velocity and now there is no velocity in this equation.. so minus is avoidable. and the kgs cancel out)
x=10
so their combined mass is a 100 kg.. (I hope I didn't mess thing up for you)

if you went to the doctor 3 weeks ago && youre going back, will they have to measure your height and weigh you again?

Answers

No, they usually will not. It also depends why you're going/why you went the first time.

Hello,

Whenever you take a visit to a doctor, he always check your height and weight no matter what time period you go.

Have A Good Day.

A stone is thrown horizontally at 8.0 m/s from a cliff 78.4 m high. How far from the base of the cliff does the stone strike the ground?

Answers

A stone is thrown horizontally at 8.0 m/s from a cliff 78.4 m high. The distance from the base of the cliff does the stone strike the ground is 64 m.

What is distance?

Distance is defined as the entire path traveled by an object in motion, regardless of journey direction. Three sight distances are primarily taken into account in the geometric design of road construction. Things that can be measured in terms of length include the dimensions of a section or a room. Distance is the separation between two things, like two cities or two points. There will never be a negative value for either length or distance.

A projectile is an object that is launched vertically into the air and moves while being pulled by gravity. A horizontally launched object that defies gravity is referred to as a projectile.

Thus, a stone is thrown horizontally at 8.0 m/s from a cliff 78.4 m high. The distance from the base of the cliff does the stone strike the ground is 64 m.

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64 meters

Sound waves can't travel through A. an elastic material.
B. a liquid.
(C. a solid.)
D. a vacuum.
I answered C and it's not correct so i dont know what else it could be please help

Answers

Sound waves can travel through ANY material ... solid, liquid, or gas.
The thing is: Sound NEEDS material to travel through, and if there's
nothing there, then sound can't go anywhere. The correct choice
on the list is 'D' ... Sound can't travel through vacuum, because
there's nothing there. When we talk to each other, the AIR between
us carries the sound waves.

Have you ever seen any video of two astronauts standing on the
moon, or two astronauts "space-walking" on the outside of the
Space Shuttle ?

Naturally, they have their helmets on, and they're talking to
each other. How are they talking ? No matter how close together
they are, they're talking to each other by radio ! because there's
nothing between them to carry sound. Even if they're only a few
inches apart, they can SHOUT but the other one can't hear it.

I have read ... I don't think there's any video of this ... that sometimes
when two astronauts are very close together, they can talk if they
touch their helmets together. Then the sound vibrations can go from
one helmet over to the other one, through the solid shell of the helmets.

Sound waves can't travel through a vacuum. The correct option is D.

Sound waves are mechanical waves that require a medium to propagate. They travel through the vibration and interaction of particles within a medium. Now let's analyze why the other options are not true:

A) An elastic material: Sound waves can travel through elastic materials such as rubber, steel, or any other solid material. In fact, solids are one of the best conductors of sound due to the close arrangement and strong intermolecular forces between their particles.

B) A liquid: Sound waves can travel through liquids such as water, oil, or any other fluid. In liquids, the particles are loosely bound, allowing them to transmit sound waves through their vibrations.

C) A solid: Sound waves can also travel through solids. As mentioned earlier, solids are excellent conductors of sound due to the tight arrangement and strong intermolecular forces between their particles. The particles of a solid can transmit sound waves through their vibrational motion.

D) A vacuum: Sound waves cannot travel through a vacuum, which is an empty space devoid of any matter or particles. Since sound waves require a medium to propagate, a vacuum, by definition, lacks the necessary particles for sound wave transmission. In a vacuum, there are no particles to vibrate and transmit the sound waves, thus making it impossible for sound to travel.

Therefore, sound waves require a medium for propagation, and they cannot travel through a vacuum. They can travel through solids, liquids, and elastic materials where particles are present to transmit wave energy.

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How does heat differ from thermal energy

Answers

Ok, so the easiest thing to do would be to first figure out the definitions, and then compare the terms from there. So, thermal energy is basically the inside or internal temperature thats part of a system due to its temperature. And, the definition of heat is high in temperature, or or something having the quality of being hot. So, if you use those definitions, you can come up with various differences. One of those differences could be that heat is the overall temperature or measure of the heat of an object, while thermal energy can be measured as the kinetic energy held within free particles or, the thermal energy per particle.

Final answer:

Thermal energy is the total internal kinetic energy due to the random motion of particles in an object, while heat is a form of energy transfer that happens due to a temperature difference between two objects or systems.

Explanation:

Heat and thermal energy are related concepts in physics but they are not the same thing. Thermal energy is the total internal kinetic energy of an object due to the random motion of its atoms and molecules. It is dependent on the temperature, mass, and type (or specific heat) of the material.

Heat, on the other hand, is a form of energy transfer that occurs due to a temperature difference between two objects or systems. It is the process of transfer of thermal energy from a hotter object to a cooler one. So, heat is a form of thermal energy in transit, typicallyg transferrin from areas of high temperature to areas of low temperature.

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While watching a recent science fiction movie, one Klingon spaceship blows up a Droid spaceship with a laser gun. The Klingon crew watches out the port window and covers their ears to muffle the noise from the explosion. Scientifically, this scene is inaccurate becauseA) light can not reflect off objects in the vacuum of space.
B) they would not be able to see anything outside the window.
C) lasers can not be transmitted through the vacuum of space.
D) the sound of the explosion would not be transmitted back to their ship.

Answers

Scientifically this scene is inaccurate because the sound of the explosion would not be transmitted back to their ship. The correct option among all the options that are given in the question is the last option or option "D". As sound cannot travel through a vacuum, so it is not possible for the crew to hear the sound of explosion.

Answer:

D. the sound of the explosion would not be transmitted back to their ship.

Explanation:

Sound is a type of mechanical wave so it needs a solid to move through. Since space is a vacuum, the Klingon crew would not be able to hear the explosion.

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1.What is true about heat capacity and specific heat?a) Only heat capacity accounts for mass. b) Both heat capacity and specific heat account for mass. c) Neither specific heat nor heat capacity accounts for mass. d) Only specific heat accounts for mass. 2. Which of the following factors is not used in calculating the specific heat of a substance? a) mass b) temperature change c) heat required for a temperature change d) melting point 3. The amount of heat needed to raise 250 g of a substance by 15 K is 2,930 J. What is the specific heat of the substance ? a) 0.78 b) 11,000 c) 780 d) 1.1 × 10^7 4. If 50 g of liquid water [C = 4,180 J/(kgK)] changes temperature in a calorimeter from 298 K to 348 K, then how much heat is transferred? a) 10.5 J b) 10.5 kJ c) 72.7 J d) 100 kJ

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Observations show that interstellar clouds can have almost any shape and, if they are rotating at all, their rotation is not perceptible. however, as shown in the video, the nebular theory predicts that a cloud will rotate rapidly once it shrinks to a small size. what physical law explains why a cloud will rotate rapidly as it collapses?