All categories

2 years ago

HELP ME ASAP! This is a question to an assignment that I have for science.

Physics

1 answer:

GarryVolchara [31]2 years ago

3 0

Answer:

density describes how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its

mass). In maths and physics density is calculated as mass defined as mass divided by volume (Density = Mass ÷ Volume).

You might be interested in

CHEGG 42 mT magnetic field points due west. If a proton of kinetic energy 9 x 10-12 J enters this field in an upward direction,

alexdok [17]

Answer:

The magnitude of the Force is $F = 697 *10^{-15}N$ and the direction is South

Explanation:

From the question we are told that

The magnetic field point due west and since East point toward the positive x -axis $(i)$ then this magnetic field would be mathematically represented as

$\= B = 42(-i)mT = 42*10^{-3} (-i) T$

Now from the question we are told that the kinetic energy is

$KE = 9*10^{-12}J$

Now this kinetic energy can be mathematically represented as

$KE = \frac{1}{2}mv^2$

Where m is the mass of proton which has a general value of

$m = 1.67*10^{-27}kg$

Now making the subject of the formula

$v = \sqrt{\frac{KE}{0.5 * m} }$

Substituting values we have

$v = \sqrt{\frac{9*10^{-12}}{0.5 * 1.67*10^{-27}} }$

$= 10.37*10^7m/s$

Now from the question we are told that proton is moving upward which is in the positive z direction so the velocity of the proton would be in the positive

So the velocity would be

$\= v = 10.37*10^{7} \r k \ m/s$

Now the magnetic Force can be mathematically represented as

$\= F = q \= v * \= B$

Where q is the charge on the proton which has a general value of $q =1.6*10^{-19}C$

Now substituting the value

$\= F = 1.6*10^{-19 } * (10.37 *10^7) \r k * (42 *10^{-3})(-i)$

$= 697*10^{-15} J$

Now according to Fleming's left hand rule the direction of the magnetic force is south toward the negative Y - direction $(-j)$

So the force can be denoted as

$\= F = 697*10^{-15}(-j) N$

6 0

3 years ago

How much heat is needed to raise the temperature of 90g of water by 64oC?

wel

The heat released or absorbed by a process where temperature changes is calculated from the product of the mass of the sample, its heat capacity (4.18 J/g C for water) and the change of the temperature.

Heat = mC(T)
Heat = 90 (4.8) (64) = 27648 J or 27.65 kJ needed

8 0

4 years ago

Anything done scientifically can be relied upon to be accurate and reliable<br> A. true<br> B. false

weeeeeb [17]

False not all science experiments are done correctly

4 0

4 years ago

What is the size of the smallest vertical plane mirror in which a 5.0 ft tall kangaroo standing erect can see her full-length im

kati45 [8]

Answer:

iskidkdikdxidkzodkxkziskkkssisi

Explanation:

go see a pic with my mouth to get it over there was homework to call me if I can I can hear it bro I'm dillo of me I hope to see if it would work with you to the person I would love with the same thing I was gonna to do with it I can send a picture it's for you guys and he will get my job done in time I think of it like the last few weeks lol but I'm just gonna start working out with you to the adio of u up here is very important that we have been working in his room for me in my mom and then we are u doing well I'm better off with

8 0

3 years ago

Bill and Nageen have each built an electric motor and they are testing them by having them lift boxes. Bill's motor lifts a box

photoshop1234 [79]

Answer:

Bill's motor power: W_B = F x S / T = F x 0.35 / 2= 0.175F

Nageen's motor power: W_N = F x S / T = F x 0.35 / 1.8 = 0.194F

=> 0.194F > 0.175F => Nageen's motor applied more power to the box than Bill's motor.

5 0

3 years ago