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Crazy boy [7]
3 years ago
13

Four engineers propose designs for door locks that are triggered by a sample of

Physics
1 answer:
sveta [45]3 years ago
7 0

Question:

A. Engineer A: "When the sample alpha decays, it will give off alpha particles. These will

trigger a photosensor (a device that senses forms of light) that will open the lock."

B. Engineer B: "When the sample alpha decays, it only releases large amounts of heat.

This will trigger a thermometer that will open the lock."

C. Engineer C: "When the sample alpha decays, it will lose mass, This will trigger a scale

that will open the lock."

D. Engineer D: "When the sample alpha decays, it will give off negatively charged alpha

particles. Because alpha particles are electrons, they will complete a circuit that will

open the lock."

Answer:

The correct option is;

A. Engineer A: "When the sample alpha decays, it will give off alpha particles. These will trigger a photosensor ( a device that senses forms of light) that will open the lock"

Explanation:

Here, we note that in alpha decay (α-decay) there is an emission of an alpha particle or helium nucleus with the transformation of the parent element nucleus into that of a different element, having reduced mass and atomic numbers

Alpha particles are a form of ionizing radiation with a mass of 6.64 × 10⁻²⁷ kg and therefore they can be sensed by a photo sensor but will be slowly sensed by a scale.

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Paraphin [41]

Answer:

F=mg

Explanation:

Close to Earth's surface, the force of gravity that pulls an object towards the ground is

F=mg (2)

where

m is the mass of the object

g is the acceleration due to gravity, which is 9.81 m/s^2 close to Earth's surface

This is an approximation of the general formula of gravity valid only close to Earth's surface. The more general formula is

F=G\frac{Mm}{r^2} (1)

where

G is the gravitational constant

M is the Earth's mass

m is the object's mass

r is the distance of the object from Earth's center

At the Earth's surface,

r = R (Earth's radius), and by calling the following factor

g=\frac{GM}{R^2}

we see that eq.(1) becomes eq.(2).

8 0
3 years ago
A hot copper pan is dropped into at tub of hot water. If the water's temperature rises, what happens to the temperature of the p
choli [55]

Explanation:

As it is given that hot pan of copper is dropped into a tub of hot water and the temperature of water rises. This means that heat from the pan has been released and this heat is gained by water.

As a result, temperature of copper pan has decreased and this decrease will continue till the time temperature of both copper pan and water will reach the same temperature.

As thermal energy is defined as the energy in which when two objects come in physical contact with each other then no exchange of heat energy will take place.

Thus, we can conclude that when temperature of both copper pan and water will be equal then it means that both of them has reached thermal equilibrium.

8 0
3 years ago
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Lillie is running. She increases her initial speed of 30 km/h to 40 km/h so she can win the race. If she takes 0.05 hours to com
Ganezh [65]

Explanation:

First convert the speed into m/s and time into seconds

5 0
2 years ago
Why do adults make bigger splashes when they jump into swimming pools than small children?
Semenov [28]

Answer:

it bc the adults are bigger then us kid so when they dip in the pool it makes bigger splashes

Explanation:

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3 years ago
A car has a force of 0.27 N and an acceleration of 3m/s2 What is the car's mass?​
lyudmila [28]

Answer:

0.09 kg

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f=0.27

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m=f/a

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m=0.09

7 0
3 years ago
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