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4 years ago

6

Supposing we launched a very fast dart from the Space Shuttle, pointed in some direction away from any planet, so that it could

travel beyond the solar system. What would it be most likely to hit first after traveling outward for a while

1 answer:

natulia [17]4 years ago

5 0

Rocks and minerals kind of dust like, that’s really all there is in space.

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A 41.0 kg child is riding a playground merry-go-round that is rotating at 60.0 rev/min. What centripetal force (in N) is exerted

Tatiana [17]

Answer:505.94 N

Explanation:

Given

mass of child (m)=41 kg

N=60 rpm

$\omega =\frac{2\pi N}{60}=4\pi rad/s$

Radius(r)=1.25 m

and centripetal acceleration is given by $m\omega ^2r$

$F_c=41\times (4\pi )^2\times 1.25=505.94 N$

3 0

4 years ago

Direction of current in a solenoid depends on the direction of magnetic field

cestrela7 [59]

Explanation:

Its direction depends on the direction of the current. ... When the current flows through the solenoid in the clockwise direction, then the magnetic lines of force inside or center of the coil will be along the axis inwards according to Fleming's right hand rule.

3 0

3 years ago

A student is bicycling north along Main Street to school. Another student is timing the bicycling student in order to determine

MatroZZZ [7]

The average velocity is -4.17 m/s

Explanation:

The average velocity of a body is given by:

$v=\frac{d}{t}$

where

d is the displacement of the body

t is the time elapsed

For the student in this problem, we have:

Initial position: $x_i = 450 m$

Final position: $x_f = 200 m$

So the displacement is

$d=x_f -x_i = 200 - 450 = -250 m$

The time elapsed is

t = 60 s

Therefore, the average velocity is

$v=\frac{-250}{60}=-4.17 m/s$

Where the negative sign means the student is moving towards the origin.

Learn more about average speed and velocity:

brainly.com/question/8893949

brainly.com/question/5063905

#LearnwithBrainly

8 0

4 years ago

At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8 m from the pivot point. On the l

Alja [10]

Answer:

Counterclockwise

Explanation:

We need to calculate the clocwkise and the counterclockwise torque.

The clockwise torque is the one generated by the child sitting on the right. This torque is given by:

$M_C = F d$

where

$F=mg=(21 kg)(9.8 m/s^2)=205.8 N$ is the force exerted by the child (his weight)

d = 1.8 m is the distance from the pivot point

So, the clockwise torque is

$M_C = (205.8 N)(1.8 m)=370.4 Nm$

The counterclockwise torque is the one generated by the adult pushing on the left, and it is given by

$M_A = F d$

where

F = 151 N is the force applied

d = 3.0 m is the distance from the pivot

Substituting,

$M_A = (151 N)(3.0 m)=453 Nm$

So, the net torque is

$M_A - M_C = 453 Nm - 370.4 Nm=82.6 Nm$

And since the counterclockwise momentum is greater than the clockwise one, the teeter-totter will rotate counterclockwise.

3 0

3 years ago

Read 2 more answers

A stone is dropped from a tower 100 meters above the ground. The stone falls past ground level and into a well. It hits the wate

Simora [160]

Answer: Option A: 22.5 m

Explanation:

A stone is dropped from a tower. The initial velocity of the stone, u = 0.

Height of the tower, y = 100 m

Let the depth of the well be d.

Time taken of the drop of the stone, t = 5 s

The stone falls under acceleration due to gravity g = 9.81 m/s²

We will use second equation of motion:

s = u t + 0.5 g t²

⇒100 m + d = 0 + 0.5 × 9.81 m/s²× (5.00 s)²

⇒d = (122.6 - 100) m = 22.6 m ≅ 22.5 m

Thus, the correct option is A. The depth of the well is 22.5 m.

3 0

4 years ago