1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Akimi4 [234]
2 years ago
14

A spring scale reads 20 N as it pulls a 4 kilogram box across a table. What is the magnitude of the force exerted by the mass on

the spring scale, if the frictional force is assumed to be equal to zero?
Physics
1 answer:
Ivan2 years ago
6 0
The answer is 40!!!!!!!!!!!!!
You might be interested in
A 3" diameter germanium wafer that is 0.020" thick at 300K has 1.015 x 10^17 As atoms added to it. What is the resistivity of th
Ber [7]

Answer:

0.546 ohm / μm

Explanation:

Given that :

N = 1.015 * 10^17

Electron mobility, u = 3900

Hole mobility, h = 1900

Ng = 4.42 x10^22

q = 1.6*10^-19

Resistivity = 1/qNu

Resistivsity (R) = 1/(1.6*10^-19 * 1.015 * 10^17 * 3900)

= 0.01578880889 ohm /cm

Resistivity of germanium :

R = 1 / 2q * sqrt(Ng) * sqrt(u*h)

R = 1 / 2 * 1.6*10^-19 * sqrt(4.42 x10^22) * sqrt(3900*1900)

R = 1 /0.0001831

R = 5461.4964 ohm /cm

5461.4964 / 10000

0.546 ohm / μm

7 0
3 years ago
When students work in a chemistry lab, the location of which items would be the most important for each student to know?
irina [24]
The safety items such as eye washing station, fire blanket, and the class shower.
6 0
3 years ago
A negative slope on the velocity vs. time graph indicates that the object is not accelerating​
liubo4ka [24]

AnswerNo

However, the acceleration is the opposite of the movement:

Explanation:

8 0
3 years ago
A 2kg bowling ball is 2.5 meter off the ground on a post when it falls. Just before it reaches the ground, it is traveling 7m/s.
shutvik [7]
<span>The mechanical energy is conserved.

I hope this helps, good luck! :)</span>
7 0
3 years ago
Two identical charges, 2 m apart, exert forces of magnitude 4 N on each other. The value of each charge is: 1. 9 × 105 C 2. 4.2
lesya692 [45]

Answer:

The value of each charge is 4.22 x 10⁻⁵ C

Explanation:

Given;

distance between the two identical charges, d = 2 m

the force of repulsion between these two charges, F = 4N

Apply Coulomb's law;

F = \frac{kq_1q_2}{r^2} \\\\but \ q_1 =q_2,then \ let \ q_1 =q_2 = q\\\\F = \frac{kq^2}{r^2}\\\\q^2 = \frac{Fr^2}{k}\\\\q^2 = \frac{4*2^2}{9*10^9} \\\\q ^2 = 1.7778*10^{-9}\\\\q = \sqrt{1.7778*10^{-9}}\\\\q =4.22 *10^{-5} C\\\\q= q_1=q_2= 4.22 *10^{-5} C

Therefore, the value of each charge is 4.22 x 10⁻⁵ C

7 0
3 years ago
Other questions:
  • A 12.0 V car battery is being used to power the headlights of a car. Each of the two headlights has a power rating of 41.8 Watts
    12·1 answer
  • A particle moves according to the law of motion s(t) = t^{3}-8t^{2}+2t, t\ge 0, where t is measured in seconds and s in feet. a.
    12·1 answer
  • Two parallel conducting plates are connected to a constant voltage source. The magnitude of the electric field between the plate
    7·1 answer
  • The water behind Grand Coulee Dam is 1000 m wide and 200 m deep. Find the hydrostatic force on the back of the dam. (Hint: the t
    10·1 answer
  • The earth makes one complete revolution around the sun in 365.24 days. Assuming that the orbit of the earth is circular and has
    14·1 answer
  • The increasing speed of a falling object is caused by
    14·1 answer
  • If vector A =i+2j-k and vec A cross vec B =3i-j+5k. find vec B​​​
    9·1 answer
  • Can someone please help me ?
    14·1 answer
  • What kind of exercise should you do when you're cooling down after an<br> intense workout?
    14·2 answers
  • In the laboratory you will find three bottles with the following labels:
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!