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
Serhud [2]
3 years ago
14

A 30 ton rail car and a 90 ton rail car, initially at rest,are connected together with a giant but massless compressed springbet

ween them. When released, the 30 ton car is pushed away at aspeed of 4.0 m/s relative to the 90 ton car. What is the speed ofthe 30 ton car relative to the ground?
Physics
1 answer:
Liula [17]3 years ago
6 0

Answer:

V2 = 1.33m/s

Explanation:

M1 = 30 ton

M2 = 90 ton

V1 = 4 m/s

V2 = ?

Assumption: momentum conserved, no friction

initial momentum = final momentum = 0  

momentum : p = MV

(M1*V1) - (M2*V2) = 0

V2 = (30*4)/90 = 1.33m/s

You might be interested in
What is the power through a device with a resistance of 100 ohms if a current of 8 A is running through it?
Kazeer [188]

Answer:

6400 W (or) 6.4 KW

Explanation:

Formula we use,

→ P = I²R

Let's solve for the power of device,

→ P = I²R

→ P = (8)² × 100

→ P = 64 × 100

→ [ P = 6400 W ]

Hence, the power is 6400 W.

5 0
2 years ago
Three 1.5V cells are connected in series in a circuit. What is the total potential difference?
lorasvet [3.4K]

Answer:

4.5V

Explanation:

1.5x3= 4.5

4 0
2 years ago
What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of​
rewona [7]

Answer:

This what they all been waiting for

I guess so

They been waiting for this sh,it for a long time didn't they

I'ma give it everything I got

Ayo Dougie park that X6 around the corner

Aye I'm just feeling my vibe right now

I'm feeling myself

Explanation:

3 0
3 years ago
PUBLIC SCHOOLS
padilas [110]

Answer:

D. The cart is moving at a constant speed or velocity

Explanation:

Equilibrium is a state of body in which it is either at rest or moves with uniform velocity. The sum of forces acting on such a body is always zero and the sum of all the torques acting on it is also zero.

There are two types of equilibrium as follows:

Static Equilibrium: When a body is at rest it is said to be in static equilibrium.

Dynamic Equilibrium: When a body is moving with constant velocity, then it is said to be in dynamic equilibrium.

Hence, the correct option here will be:

<u>D. The cart is moving at a constant speed or velocity</u>

4 0
3 years ago
Starting from rest, a basketball rolls from top of a hill to the bottom, reaching a translational speed of 6.8 m/s. Ignore frict
kkurt [141]

Answer:

Explanation:

for baseball

(a) Let the mass of the baseball is m.

radius of baseball is r.

Total kinetic energy of the baseball, T = rotational kinetic energy + translational kinetic energy

T = 0.5 Iω² + 0.5 mv²

Where, I be the moment of inertia and ω be the angular speed.

ω = v/r

T = 0.5 x 2/3 mr² x v²/r² + 0.5 mv²

T = 0.83 mv²

According to the conservation of energy, the total kinetic energy at the bottom is equal to the total potential energy at the top.

m g h = 0.83 mv²

where, h be the height of the top of the hill.

9.8 x h = 0.83 x 6.8 x 6.8

h = 3.93 m

(b) Let the velocity of juice can is v'.

moment of inertia of the juice can = 1/2mr²

So, total kinetic energy

T = 0.5 x I x ω² + 0.5 mv²

T = 0.5 x 0.5 x m x r² x v²/r² + 0.5 mv²

m g h = 0.75 mv²

9.8 x 3.93 = 0.75 v²

v = 7.2 m/s

7 0
3 years ago
Other questions:
  • I dont get why its c i dont under the graph for the vertical component in option c
    14·1 answer
  • physics a flower pot falls from a windowsill 25.0m above the sidewalk. how much time does a passerby on the sidewalk below have
    8·1 answer
  • Consider a blackbody that radiates with an intensity i1 at a room temperature of 300k. At what intensity i2 will this blackbody
    14·1 answer
  • Please help!!!!!!!!!
    12·1 answer
  • In physics, for a given object, work divided by distance will equal
    9·1 answer
  • The density of a solid or liquid material divided by the density of water is called
    12·1 answer
  • Select the correct answer. What happens to the molecules within a gas when the gas condenses?
    7·1 answer
  • Which of these statements best describes the relationship between elements, compounds, and pure substances? (2 points)
    13·1 answer
  • Clouds are formed when water vapor in the atmosphere becomes a liquid and condenses. Condensation is a result of the difference
    15·1 answer
  • A golf ball is hit so that it leaves the club face at a velocity of 45m/s at an angle of 40° to the horizontal. by ignoring the
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!