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
bekas [8.4K]
3 years ago
5

An object, which is initially at rest, accelerates at a rate of 10 m/s2 . Its final position is 85 m from its initial position a

t the end of that acceleration. For how much time did it accelerate?
Physics
1 answer:
vesna_86 [32]3 years ago
4 0

Answer:

4.12 seconds

Explanation:

From the kinetic equation

s=ut+0.5at^{2} where s is the displacement, u is initial velocity, t is time of travel and a is acceleration.

Since the object is initially at rest, the initial velocity is zero hence the equation can be re-written as

s=0.5at^{2} and making t the subject of the formula

t=\sqrt {\frac {2s}{a}}

Substituting s for 85 m and a for 10 m/s2

t=\sqrt {\frac {2*85 m}{10}}=4.123105626 s

Therefore, time is approximately 4.12 seconds

You might be interested in
Where do earthquakes come from?
defon

tectonic plates rubbing against each other.


6 0
3 years ago
Read 2 more answers
Please help! Will give a lot of points
krek1111 [17]
Answer:

Chemical and Biological weathering.

Explanation:

Processes that break down and weaken earth minerals are known as weathering. Over time, this can lead to erosion, in which huge sections of rock and stone are carried away, changing landscapes. Physical weathering alters the material structure of rocks, while chemical weathering alters their chemical structure.
3 0
2 years ago
HELP PLZZZZZ NOW!!!
Aneli [31]

Answer:Climatic processes affect the dynamics of Earth's ice sheets and glaciers, and along ... by abrupt events and by continuous reshaping of Earth's surface from surface ... Forecasting natural disasters, including the timing and size of earthquakes, the . Last, human activity has a profound impact on water resources, landscape

Explanation:

step by step

3 0
3 years ago
Read 2 more answers
The police department is excited to have some new motorcycle units. One officer said that these motorcycles can go from 0 miles
vaieri [72.5K]
The officer is describing the motorcycle's acceleration

That is, he's describing how the motorcycle's velocity changes when compared to the time. That's the formula for calculating the average acceleration of any body.
3 0
3 years ago
Assume: The bullet penetrates into the block and stops due to its friction with the block. The compound system of the block plus
tino4ka555 [31]

Answer:

1)4.7334J

2)225.4m/s

Explanation:

v= the Velocity of both the bullet and the block after collision=?

H= Height of the bullet along circular arc= 10cm=0.1m

g= acceleration due to gravity= 9.81m/s^2

R= Radius of the circular arc= 18cm= 0.18m

m= Mass of the bullet= 30g= 0.03kg

M= Mass of the block = 4.8 kg

Using the law of conservation of energy

Potential energy of the system= Kinectic energy of the system

1/2 mv^2= mgh..............eqn(1)

But we have two mass m and M

We can write eqn(1) as

0.5(m+M)v^2= (m+M)gh ...........eqn(2)

If we make "v" subject of the formula we have

v = √2gh

Then substitute the values we have

= √2 x 9.81 x 0.1 = 1.40m/s

1) We can now calculate the total energy of the system after collision as

KE = 1/2(m+M)v^2

= 1/2 x (0.03+4.8) x (1.40)^2

KE = 4.7334J

Hence, the total energy of the composite system at any time after the collision is 4.7334J

2)to determine the initial velocity of the bullet.

From law of momentum conservation, which can be expressed as

m1u1+m2u2=(m1+m2)v

Where the initial Velocity of the bullet u1= ?

Final velocity of the bullet = 0

the Velocity of both the bullet and the block after collision=v= 1.40m/s

(0.03×u1) +(u×0)= (4.8+0.03)1.4

0.03u1=6.762

U1=225.4m/s

Hence, the initial velocity of the bullet is 225.4m/s

3 0
3 years ago
Other questions:
  • SOMEONE PRETTY PLEASE FILL THIS OUT Its the ball drop project Lab Report Title: Formulate Hypothesis: What are your independent,
    11·1 answer
  • Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students?
    6·2 answers
  • Why nucleus density is constant. Explain
    8·1 answer
  • This image shows a stream of positively charged particles being directed at gold foil. The positively charged particles are call
    13·2 answers
  • [3 points] Question: Consider a pendulum made from a uniform, solid rod of mass M and length L attached to a hoop of mass M and
    8·2 answers
  • How does a thermostat know how to keep hot soup hot and cold soup cold?
    11·1 answer
  • Lithium and francium have similar properties because they
    5·1 answer
  • How many times Father is Proxima Centauri from the sun then is earth from the sun answer choices about 269,000 times or about 0.
    15·1 answer
  • Help :(
    12·1 answer
  • 9) 25cm³ of a liquid x of density 1.2g/cm³ is mixed with liquid of volume 30 cm³ and 0.9g/cm³ without change in volume. Calculat
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!