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3 years ago

2. 3000. kg car is moving across level ground at 5.0 m/s when it begins an

Physics

1 answer:

gizmo_the_mogwai [7]3 years ago

7 0

Answer:

yes

Explanation: Work is done when there is movement. Therefore it was work was being done.

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A locomotive is pulling 8 freight cars, each of which is loaded with the same amount of weight. The mass of each freight car (wi

nikitadnepr [17]

Answer:106560 N

Explanation:

Given

Let Tension between 2 and 3 car be $T_{23}$ and between 3 &4 is $T_{34}$

$T_{23}-T_{34}=ma$

mass of freight car =37,000 kg

acceleration of car $=0.48 m/s^2$

$T_{34}$ is accelerating all freights behind 3

therefore

$T_{34}=5\times ma$

$T_{34}=5\times 37000\times 0.48=88,800 N$

Thus

$T_{23}=T_{34}+ma$

$T_{23}=88,800+37000\times 0.48=88,800+17,760=106560 N$

4 0

4 years ago

Why is si unit called coherent system

Sladkaya [172]

Answer:

The SI system is also called coherent system of units because of the following reasons: ... 1 Newton (SI unit of Force) = 1 Kg (SI unit of mass) x 1 m (SI unit of distance) / s2 (SI unit of time) , therefore 1 Newton is a coherent unit of Force.

HOPE ITS HELP

<h2>#BRAINLEST</h2>

6 0

3 years ago

A 5-kg brick sliding on an ice covered pond has a kinetic energy of 16 Joules. a box of identical mass but half the speed is sli

ludmilkaskok [199]

It would have 8 joules because if the box is going half the speed with the same mass the you would just divide the joules in half

8 0

3 years ago

A toy uses a spring to shoot an arrow with a suction cup on the end. The toy shoots a 34.2 g arrow and gives it a speed of 5.50

Jet001 [13]

Explanation:

When spring is used to shoot an arrow, the Elastic Potential Energy is converted into Kinetic Energy.

The efficiency of Spring Toy = 69%

According to Conservation of Energy :

P. E. = K. E.

NOW,

69% of P. E. = m * v^2 / 2

$P.E. = \frac{0.0342 \times 5.5 \times 5.5}{2 \times 0.69} = 0.75J$

6 0

3 years ago

in pea plants smooth seeds are dominant (S) and wrinkled seeds are reccessive(s). In a cross between two heterozygous plants, wh

Phantasy [73]

25% SS, 50% Ss, 25% ss, or 75% smooth, 25% wrinkled

5 0

3 years ago