A radioactive element X with atomic number 88 and mass number 226 emits in succession:1)alpha particle

A proton travels with a speed of 1.8×106 m/s at an angle 53◦ with a magnetic field of 0.49 T pointed in the +y direction. The ma

Likurg_2 [28]

Answer:

Magnetic force, $F=1.12\times 10^{-13}\ N$

Explanation:

It is given that,

Velocity of proton, $v=1.8\times 10^6\ m/s$

Angle between velocity and the magnetic field, θ = 53°

Magnetic field, B = 0.49 T

The mass of proton, $m=1.672\times 10^{-27}\ kg$

The charge on proton, $q=1.6\times 10^{-19}\ C$

The magnitude of magnetic force is given by :

$F=qvB\ sin\theta$

$F=1.6\times 10^{-19}\ C\times 1.8\times 10^6\ m/s\times 0.49\ Tsin(53)$

$F=1.12\times 10^{-13}\ N$

So, the magnitude of the magnetic force on the proton is $1.12\times 10^{-13}\ N$ . Hence, this is the required solution.

3 0

4 years ago

I am a bit confused about this question.

gavmur [86]

How do you know when something is moving ? You ALWAYS have to compare it to something else. If the object in question changes its distance or direction from your house, or from your big toe, or from a stake in the ground in your front yard, then you say it's moving. The thing is: There's ALWAYS something else to compare it to.

I assume you're sitting on the couch now, staring at the TV, or at your computer, or at your phone. Compared to the couch, or to the tree in your front yard, or to somebody sitting on top of Mt. Everest, or to downtown Jerusalem, you're NOT moving. Your distance and direction from the reference point isn't changing.

BUT ... what if you compare yourself to somebody sitting at the North pole of the Sun ? He has to keep turning his eyes to watch you (because the Earth including you is in orbit around the sun). So your direction from him keeps changing, and 'relative' to him (compared to him), you're definitely moving.

Now let's go a little farther:

You're sitting in a comfy seat, reading a book that's in your lap. Maybe you're even getting sleepy. You're sitting still in the seat, and the book in your lap isn't moving.

SURPRISE ! Your comfy seat is in Row-27 of a passenger jet, and you're flying to Seattle to visit your Grandma. right now, you're just passing over Casper, Wyoming, and there's somebody down on the ground playing with a telescope. He looks at your airplane, and HE says that you, the seat you're sitting in, and your book are ALL moving at almost 500 miles an hour.

The difference is: YOU're comparing your book to the seat in front of you, and YOU say the book is not moving. The guy with the telescope is comparing the book to the ground he's standing on, and HE says your book is moving west at 500 miles an hour.

You're BOTH correct. The description of ANY motion always depends on what you're comparing to. If you're about to ask "What's the REAL motion of the book ?", then I'm sorry. There's NO SUCH THING as 'REALLY'. It always depends on what you're comparing to. Nine people can be watching the same object, and they can have nine different descriptions of its motion, and they're ALL correct. They're just comparing the object to different things in their own neighborhood, and the nine things are all moving in different ways.

The bottom line: MOTION IS ALWAYS RELATIVE (to something else).

8 0

3 years ago

A jar of tea is placed in sunlight until it

Tanzania [10]

Answer:

m = 4.44 [g]

Explanation:

This is a problem related to heat transfer and thermodynamics. The second law of thermodynamics tells us that heat goes in only one direction, from the highest temperature substance to the lowest temperature. In this case the heat goes from tea to ice. The heat transfer process could be defined as the heat rejection of one body will be equal to the Heat received by another body.

$Q_{out}=Q_{in}\\Q_{out}=m*cp*(T_{f}-T_{i})$

Where:

m = mass = 177[g] = 0.177[kg]

Cp = specific heat = 4186 [J/kg*C]

T_f = 29.1 [°C]

Ti = 31.1 [°C]

Q = 0.177*4186*(29.1 - 31.1)

Q = - 1481.8 [J]

Note: The negative sign means that the heat is rejected.

Recall that the heat rejected is equal to the heat transferred

As the ice is going through a phase change, the fusion latent heat should be used, i.e. when it passes from solid to liquid. The heat transfer for this process is calculated with the following expression.

Qin = m *hf

m = mass of the ice [kg]

hf = Fusion latent heat = 333700 [J/kg]

1481.8 = m * 333700

m = 0.00444 [kg] = 4.44 [g]

7 0

4 years ago

The thermal conductivity of a cement is 0.168 British thermal units per foot hour degree Fahrenheit [BTU divided by (ft h Super

Sliva [168]

Answer:

thermal conductivity = 0.2906 W/m.K

Explanation:

thermal conductivity = 0.168 BTU/h.ft⁰F

1 BTU/h.ft⁰F = 1.7295772056 W/m.k

0.168 BTU/h.ft⁰F = 0.168 * 1.7295772056 W/m.k

0.168 BTU/h.ft⁰F = 0.2906 W/m.k

5 0

4 years ago

Countercurrent exchange is evident in the flow of _____.

Anna35 [415]

Answer:

In the water flow mechanism in fishes when they take in oxygen using the gills

Explanation:

Fish gills are organ that facilites respiration under water,its Mechanism is described below,first water is pulled in the mouth of the fish and pumped over the gills,while the blood flow in opposite direction known as counter current exchange helps in pushing low oxgen water away and retaining high oxgen in the fish blood.

4 0

3 years ago