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
Viktor [21]
3 years ago
8

The ball is dropped from a certain height and is falling to the ground. If its acceleration is a constant 9.8 meters per second

squared, how many seconds would it have dropped when the velocity is 49.0 m/s ????
A. 4.9 secs
B. 4 secs
C. 5 secs
D. 9.8 secs

Physics
1 answer:
lord [1]3 years ago
7 0
5 secs I did 49 divided by 9.8 and got 5
You might be interested in
PLEASE HURRY WILL GIVE BRAINLIEST
bazaltina [42]

(a) the three resistors are in parallel, so the equivalent resistance R is given by

1/R= 1/5 + 1/10 +1/15

1/R= 11/30

R=2.7ohm

(b) Voltage in the circuit= 120 V

(c) for current, we use ohm's law

V= i R

120= i (2.7)

i=44 A

6 0
4 years ago
Read 2 more answers
Someone who has nostres that are not separated equally has which sensory issue?
Zina [86]

Answer:

i think B. Deviated septum

5 0
3 years ago
What aspect of motion can you conclude is common among freely falling objects ?
Liula [17]

Answer:

Free-fall is defined as the movement where the only force acting on an object is the gravitational force.

By the second Newton's law, we have that:

F = m*a

Where F = Force, m = mass, a = acceleration.

We can write this as:

a = F/m

And the gravitational force can be written as:

F = (G*M/r^2)*m

Where G is the gravitational constant, M is the mass of the Earth in this case, and r is the distance between both objects (the center of the Earth and the free-falling object)

As the radius of the Earth is really big, the term inside the parentheses is almost constant in the region of interest, then we can write:

G*M/r^2 ≈ g

And the gravitational force is:

F = g*m

And by the second Newton's law we had:

a = F/m = (g*m)/m = g

a = g

Then the acceleration does not depend on the mass of the object.

Then the thing that is common among the free-falling objects is the vertical acceleration.

6 0
3 years ago
A sample of N-type silicon is at the room temperature. When an electric field with a strength of 1000V /cm is applied to the sam
V125BC [204]

Answer:

a) 222/cm^3

b) The Ec with respect to Ef and Ev = -0.107ev

c) Resistance, R = 467 ohms

Explanation:

(a) From the velocity and the applied electric field, we can calculate the mobility of holes:

υdp = µpε, µp = υdp/ε = 2×10^5/1000

= 200cm2/V.s

From a), we find Nd is equal to 4.5×1017/cm3

. Hence,

n = Nd = 4.5×10^17/cm3

, and p = ni^2/n

= ni^2/Nd

= 10^20 / 4.5×10^17 = 222/cm3

.

Clearly, the minority carrier is hole.

(b) The Fermi level with respect to Ec is

Ef = Ec - kTln(Nd/Nc) = Ec - 0.107 eV.

(c) R = ρL/A. Using Equation, we first calculate the resistivity of the sample:

σ = q(µn n + µp p) ≈ qµn n = 1.6×10^-19 × 400 × 4.5×10^17 = 28.8/Ω-cm, and

ρ= σ

-1 = 0.035 Ω-cm.

Therefore, R = (0.035) × 20µm / (10µm× 1.5µm) = 467 Ω.

5 0
3 years ago
If a car changes its velocity from 32km/hr in 8.0 seconds what is its acceleration
puteri [66]

We don't know the change in velocity, so can't answer.

3 0
3 years ago
Other questions:
  • What is the charge of Scandium?
    5·2 answers
  • What are the two types of modern wind turbines?<br><br> (please list TWO modern wind turbines)
    10·1 answer
  • The total potential and kinetic energy of all the microscopic particles in an object make up its
    6·1 answer
  • g a 240 V&lt;0 source source supplies a balance, three-phase load in a delta configuration. The line current is 3 A&lt;45. What
    9·1 answer
  • For a moon orbiting its planet, rp is the shortest distance between the moon and its planet andra is the longest distance betwee
    14·1 answer
  • How much heat is required to convert 1 gm of ice into steam​
    13·1 answer
  • Imagine the earth no longer have the moon which of the following would probably be true a The change and water levels during tid
    9·1 answer
  • Help please i will mark brainlist!!
    7·2 answers
  • Describe three events that you cannot explain.<br> About energy and matter
    8·1 answer
  • 56. What is the range of magnitudes that can be attained from the
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!