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tresset_1 [31]
4 years ago
12

27. Calculate the impulse when an average force of 10 N acts on a cart for 5.0 s.

Physics
1 answer:
wlad13 [49]4 years ago
6 0

Answer:

50 Ns

Explanation:

Impulse = force × time

J = F Δt

J = (10 N) (5.0 s)

J = 50 Ns

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A rocket takes off from Earth's surface, accelerating straight up at 47.2 m/s2. Calculate the normal force (in N) acting on an a
lions [1.4K]

Answer:

Approximately 4.61\times 10^{3}\; {\rm N} upwards (assuming that g = 9.81\; {\rm m\cdot s^{-2}}.)

Explanation:

External forces on this astronaut:

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  • Normal force from the floor (upwards.)

Let (\text{normal force}) denote the magnitude of the normal force on this astronaut from the floor. Since the direction of the normal force is opposite to the direction of the gravitational attraction, the magnitude of the net force on this astronaut would be:

\begin{aligned}(\text{net force}) &= (\text{normal force}) - (\text{weight})\end{aligned}.

Let m denote the mass of this astronaut. The magnitude of the gravitational attraction on this astronaut would be (\text{weight}) = m\, g.

Let a denote the acceleration of this astronaut. The magnitude of the net force on this astronaut would be (\text{net force}) = m\, a.

Rearrange \begin{aligned}(\text{net force}) &= (\text{normal force}) - (\text{weight})\end{aligned} to obtain an expression for the magnitude of the normal force on this astronaut:

\begin{aligned}(\text{normal force}) &= (\text{net force}) + (\text{weight}) \\ &= m\, a + m\, g \\ &= m\, (a + g) \\ &= 80.9\; {\rm kg} \times (47.2\; {\rm m\cdot s^{-2}} + 9.81\; {\rm m\cdot s^{-2}}) \\ &\approx 4.61 \times 10^{3}\; {\rm N}\end{aligned}.

3 0
2 years ago
Johanna makes the table below to organize her notes about centripetal forces.
umka21 [38]

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Johanna's table:

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       space station in orbit                         X

        a child in a swing

         a ball on a string

The type of centripetal force at work in a space station in orbit is the force of gravity.

The force of gravity is constantly pulling and attractive all objects and bodies to its center.

This force is directed towards the center of the orbit of the earth and it is a centripetal force

  • Gravity attracts any object that has mass.
  • The mass of the satellite and the earth keeps it in orbit and prevents it from moving out of orbit.
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learn more

Universal Gravitation brainly.com/question/1724648

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