How many moles of He atoms are in 6.00 g of He?

The music is in ___meter? a.free time b.duple c.triple d.quadruple

Rashid [163]

D.quadruple is the answer

4 0

3 years ago

Here are the questions you need to answer for this assignment. After reading the questions carefully, pick arbitrary numbers to

MrRissso [65]

Answer:

this dont even explain the question

Explanation:

5 0

3 years ago

A pen contains a spring with a spring constant of 270 N/m. When the tip of the pen is in its retracted position, the spring is c

vodka [1.7K]

Answer:

-0.9045 j

Explanation:

Here K= 270 N/m

distance 1 = 4.60 mm=0.0046 m

when pen is compressed ;

distance 2 = 6.70 mm + distance1 = 0.0067 m+0.0046 m= 0.0113 m

The pen store in itself two types of PE

Which is Initial PEi = 1/2 ×K× [ $distance 1^{2}$ =0.5×270×0.0046 =0.621 j

and Final PEf = 1/2 × K × $distance 2^{2}$ = 0.5×270×0.0113=1.5255 j

When the pen gets ready - it goes ahead distance d2 and is then pressed back distance d1 for writing.

Total PE when ready = 0.621-1.5255= - 0.9045 j

so, work = -0.9045 j

8 0

3 years ago

A 3.4 nC charged particle has a velocity of 4.7 m/s and is moving in the +x-direction. If this charge is in a magnetic field det

zloy xaker [14]

Answer:

Magnetic force, $F=1.22\times 10^{-7}\ N$

Explanation:

It is given that,

Charge, $q=3.4\ nC=3.4\times 10^{-9}\ C$

Velocity, v = 4.7 m/s

Magnetic field, $B=-1.4i+7.52j$

$|B|=\sqrt{(-1.4)^2+(7.52)^2}=7.64\ T$

Magnetic force is given by :

$F=q\times v\times B$

$F=3.4\times 10^{-9}\ C\times 4.7\ m/s\times 7.64\ T$

$F=1.22\times 10^{-7}\ N$

So, the magnetic force on this particle is $1.22\times 10^{-7}\ N$ . Hence, this is the required solution.

5 0

3 years ago

if brakes were applied to a already moving car with a speed of 72 kilometre per hour to reduce it to the speed of 18 kilometre p

yarga [219]

Answer:

Acceleration, a = -0.5 m/s²

Explanation:

Given the following data;

Initial velocity = 72 km/h

Final velocity = 18 km/h

Time = 10 seconds

To find the acceleration of the car;

Conversion:

72 km/h to m/s = 72*1000/3600 = 20m/s

18 km/h to m/s = 18*1000/3600 = 5 m/s

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

$Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}$

Substituting into the equation;

$a = \frac{5 - 20}{10}$

$a = \frac{-5}{10}$

Acceleration, a = -0.5 m/s²

Therefore, the car is decelerating.

5 0

3 years ago