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3 years ago

Who was Christa McAuliffe and what happened this year to make her dream come true?

Physics

2 answers:

Leokris [45]3 years ago

7 0

A teacher killed in a spae shuttle accident when launched, her dream was to teach from space

Kryger [21]3 years ago

5 0

On July 19th, 1985 Christa McAuliffe was selected as the first teacher to go to space by NASA. Her dream was to be the first teacher to go to space with all her lessons. Her daughter keeps her dream alive today by setting up 40 schools called the McAuliffe Centre.

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8. two +1 C charges are separated by 3000m. What is the magnitude of the electric force between them?

Sidana [21]

Answer:

1000 N

Explanation:

The magnitude of the electrostatic force between two charged object is given by

$F=k\frac{q_1 q_2}{r^2}$

where

k is the Coulomb constant

q1, q2 is the magnitude of the two charges

r is the distance between the two objects

Moreover, the force is:

- Attractive if the two forces have opposite sign

- Repulsive if the two forces have same sign

In this problem:

$q_1=q_2=+1C$ are the two charges

r = 3000 m is their separation

Therefore, the electric force between the charges is:

$F=(9\cdot 10^9)\frac{(1)(1)}{3000^2}=1000 N$

8 0

3 years ago

A bicyclist is riding to the left with a velocity of 14 \,\dfrac{\text m}{\text s}14 s m 14, start fraction, start text, m, en

Gnesinka [82]

Answer:

-2.0 m/s²

Explanation:Acceleration is the rate of change of velocity.

\begin{aligned}a&=\dfrac{\text{Change in velocity}}{\text{Change in time}}\\ \\ &=\dfrac{v_f-v_i}{\Delta t} \end{aligned}

Change in time

Change in velocity

Δt

−v

Hint #22 / 3

We can calculate the bicyclist's acceleration from the final velocity v_fv

v, start subscript, f, end subscript, initial velocity v_iv

v, start subscript, i, end subscript, and time interval \Delta tΔtdelta, t.

\begin{aligned}a&=\dfrac{v_f-v_i}{\Delta t}\\ \\ &=\dfrac{-21\,\dfrac{\text m}{\text s}-(-14\,\dfrac{\text m}{\text s})}{3.5\,\text s}\\ \\ &=-2.0\,\dfrac{\text m}{\text s^2}\end{aligned}

Δt

−v

3.5s

−21

−(−14

)

=−2.0

Hint #33 / 3

The acceleration of the bicyclist is -2.0\,\dfrac{\text m}{\text s^2}−2.0

minus, 2, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, squared, end fraction.

5 0

3 years ago

During the day, the earth is heated up by the sun. The land gets hotter than the sea because it takes less energy to increase th

Andrew [12]

Convection and Conduction

4 0

4 years ago

Read 2 more answers

Anna learned that every magnet has a north and a south end called poles. One day, while she is playing with magnets she notices

maria [59]

B) opposite poles of magnets attract

4 0

4 years ago

Read 2 more answers

What will happen to the centripetal acceleration if the velocity of the object increases to two times its original value?

mrs_skeptik [129]

Answer:

<em>the centripetal acceleration will now be four times its initial value</em>

Explanation:

v=velocity

a=centripetal acceleration

r=radius to the center

take note tat a centripetal force is the force tat is needed to keep a body moving along a circular path

centripetal force is given by f=mv^2/r

a=v^2/r

v=v $v_{0}$

wen v $v_{0}$ is doubled , we ave

2v $v_{0}$

substituting into the previous equation of centripetal force

a=( $(2v_{0})^{2}$ /r

a=4 $v_{0}$ ^{2}/(r)

from the equation, is can be discovered that the centripetal acceleration will now be four times its initial value

4 0

4 years ago