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
11111nata11111 [884]
2 years ago
14

An object with mass 110 kg moved in outer space. When it was at location < 13, -18, -2 > its speed was 19.5 m/s. A single

constant force < 250, 390, -220 > N acted on the object while the object moved to location < 19, -23, -5 > m. What is the speed of the object at this final location
Physics
1 answer:
Serhud [2]2 years ago
6 0

Answer:

v = 21.4m/s

Explanation:

Given r1 = < 13, -18, -2 > m,

F = < 250, 390, -220 > N, r2 = < 19, -23, -5 > m

Where r1 and r2 are position vectors in space and F is the constant force vector in space.

r2 - r1 = < 19–13, -23–(-18), -5–(-2) > m

Δr = < 6, -5, -3 > m

F = m×a

a = F/m

m = 110kg (scalar quantity)

a = < 250/110, 390/110, -220/110 >

a = < 2.27, 3.55, -2 > m/s²

Since the force is constant, the acceleration is also constant. Therefore the equations of constant acceleration motion apply here.

V² = u² +2aΔr

The magnitude of the acceleration is calculated as follows

a = √(2.27² + 3.55² +(-2)²)

a = √(21.7554)

a = 4.66m/s²

Magnitude of Δr,

Δr = √(6² + (-5)² +(-3)²) = √(70) = 8.37m

Having calculated the magnitude of the acceleration and displacement, we can now calculate the final velocity.

u = initial velocity = 19.5m/s

v² = 19.5² + 2×4.66×8.37

v² = 458.25

v = √(458.25)

v = 21.4m/s

You might be interested in
How much potential energy foes a 5kg mass have when its 2 meters above the ground?(Hint :PE=m*g*h)​
frez [133]

Answer:

<h2>98 J</h2>

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 9.8 m/s²

From the question we have

PE = 5 × 9.8 × 2

We have the final answer as

<h3>98 J</h3>

Hope this helps you

5 0
2 years ago
A girl pushes her little brother on his sled with a force of 300 N for 750 m.
Katarina [22]

Answer:

W = F× d

= 300×750

= 225000

E = 225000

P = 300×750/25 = 9000

P = 300× 750/10 = 22500

7 0
2 years ago
Chapter 16, Problem 63. A person is standing in a room at 18 ◦C. The exposed surface area and skin temperature of the person are
Juliette [100K]

Answer:Q=248.011 W

Explanation:

Given

Temperature of Room T_{\infty }=18^{\circ}\approx 291 K

Area of Person A=1.7 m^2

Temperature of skin T=32^{\circ}\approx 305 K

Heat transfer coefficient h=5 W/m^2.k

Emissivity of the skin and clothes \epsilon =0.9

\Delta T=32-18=14^{\circ}

Total rate of heat transfer=heat Transfer due to Radiation +heat transfer through convection

Heat transfer due radiation Q_1=\epsilon \sigma A(T^4-T_{\infty }^4 )

where \sigma =stefan-boltzman\ constant

Q_1=0.9\times 5.687\times 10^{-8}\times 1.7\times (305^4-291^4)

Q_1=129.01 W

Heat Transfer due to convection is given by

Q_2=hA(\Delta T)

Q_2=5\times 1.7\times 14=119 W

Q=Q_1+Q_2

Q=129.01+119=248.011 W

7 0
3 years ago
How is it technically correct to say that a car making a u-turn can have a constant speed but cannot have a constant velocity?
saw5 [17]

During the "U" part of the turn, the car would follow an approximately circular path, and if it's moving at a constant speed, it would have to accelerate toward the center of the circle in order to change its direction.

5 0
2 years ago
Recycled plastics cannot be used to produce new food containers because ___
Lena [83]

they cannot be sterilized

4 0
3 years ago
Other questions:
  • Does the moon light originate from the moon only
    11·1 answer
  • Juggles the clown stands on one end of a teeter-totter at rest on the ground. Bangles the clown jumps off a platform 2.4 m above
    9·1 answer
  • The sun emits energy by converting hydrogen into helium. what is this process called?
    6·1 answer
  • The image shows streetlights powered by solar panels. Which sequence shows the energy transformation is taking place in these li
    14·2 answers
  • To what does the term register refer in describing sound?
    8·1 answer
  • The outer layer of bone _____.
    14·1 answer
  • Determina el trabajo realizado al desplazar un bloque 3 m sobre una superficie horizontal, si se desprecia la fricción y la fuer
    10·1 answer
  • What dose air taste like and wrong answer only
    14·2 answers
  • The pressure exerted at the bottom of a column of liquid is 30 kPa. The height of the
    7·1 answer
  • HELPPPPP
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!