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Volgvan
3 years ago
11

A researcher measures 200 counts per minute coming from a radioactive source at noon. At 3:00pm, she finds that this has dropped

to 25 counts per minute. What percentage of the original source will remain at 6:00pm?
A) 3.125%
B) 4.5%
C) 5.8%
D) 6.25%
Physics
1 answer:
patriot [66]3 years ago
4 0

Answer:

UWU ForkNit Nub X3 Scrub get plied uWu x333333

Explanation:

idk lol I need the answer too

Ok I commited yolo the answer is 3.125%

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After grocery shopping, Eric makes the trip home in 25 minutes. What is the magnitude of the difference in average velocity betw
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The two dogs sitting here are already poor and ignorant

5 0
3 years ago
A CD is spinning on a CD player. In 12 radians, the cd has reached an angular speed of 17 r a d s by accelerating with a constan
mote1985 [20]

Answer:

The initial angular speed of the CD is equal to 14.73 rad/s.

Explanation:

Given that,

Angular displacement, \theta=12\ rad

Final angular speed, \omega_f=17\ rad/s

The acceleration of the CD,\alpha =3\ rad/s^2

We need to find the initial angular speed of the CD. Using third equation of kinematics to find it such that,

\omega_f^2=\omega_i^2+2\alpha \theta\\\\\omega_i^2=\omega_f^2-2\alpha \theta

Put all the values,

\omega_i^2=(17)^2-2\times 3\times 12\\\\\omega_i=\sqrt{217}\\\\\omega_i=14.73\ rad/s

So, the initial angular speed of the CD is equal to 14.73 rad/s.

3 0
3 years ago
In each pair, select the body with more internal energy.
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Answer:

rt

Explanation:

4 0
3 years ago
Mercury, a planet in our Solar System, and Callisto, a moon of the planet Jupiter, are about the same size. However, Mercury’s m
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You may jump higher because the more the mass of the planet, the more gravitational force. There is less mass(and gravity) on Callisto so you wouldn’t be weighed down as much and can jump higher. Whereas on Jupiter there is more weight holding you down.
3 0
3 years ago
Read 2 more answers
On being introduced to the laws of thermodynamics, a student retorted, “When the brakes of a moving car are applied, the kinetic
inn [45]

Answer:

No, not at all. This kinetic energy of car is converted/lost in the form of sound and heat under the tyre when driver apply brakes.

Explanation:

This law states that energy can neither be created nor destroyed but it changes from one form to the other.

In this case reduction of kinetic energy of car does not contradict the law but it changes into heat and sound energy. When driver apply brakes we hear the sound of Tyre due to friction with the road. The tyre become hot too.

So it is not in contradiction to the law of conservation of energy (First Law of Thermodynamics).

Please mark branliest if you are satisfied with the answer. Thanking you in anticipation.

5 0
3 years ago
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