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2 years ago

What is the acceleration of the box shown below.

Physics

2 answers:

-BARSIC- [3]2 years ago

4 0

Explanation:

Fnet= Fapp - F friction

=50-30

=20 N

Acceleration= force/ mass

=20/20

=1.0 m/s²

olga nikolaevna [1]2 years ago

3 0

Answer:

D) 1.0m/s^2

Explanation:

Force = 50 - 30 = 20

Acceleration = 20/20

= 1

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Which declares two related integer vectors named personname and personage each with 50 elements?

Serjik [45]

Both vectors should be declared to have the same number of elements.

vector<int> personName(50); vector<int> personAge(50)

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1 year ago

You drive 6.00 km at 50.0 km/h and then another 6.00kmat 900 km/h Your average speed over

Cerrena [4.2K]

Explanation:

average speed = total distance travelled / total time travelled

time to travel the first 6km: 6 / 50 = 3/25 (h)

time to travel the next 6km: 6 / 90 = 1/15 (h)

[I think there's problem in the question 'cause 900km/h sounds impossible for normal person to travel in normal condition]

The total time: 3/25 + 1/15 = 14/75 (h)

Average speed over the 12 km drive will be:

$\frac{12}{ \frac{14}{75} } = \frac{450}{7} = 64.3 \: km{h}^{ - 1}$

8 0

2 years ago

A diver can change his rotational inertia by drawing his arms andlegs close to his body in the tuck position. After he leaves th

NeX [460]

Answer:

3.14946 rad/s

Explanation:

$I_i$ = Intial moment of inertia

$I_f$ = Final moment of inertia

$\omega_i$ = Initial angular velocity

$\omega_f$ = Final angular velocity = $\dfrac{2}{1.33}\times 2\pi\ rad/s$

$\dfrac{I_f}{I_i}=\dfrac{1}{3}$

In this system the angular momentum is conserved

$L_i=L_f\\\Rightarrow I_i\omega_i=I_f\omega_f\\\Rightarrow \omega_i=\dfrac{I_f\omega_f}{I_i}\\\Rightarrow \omega_i=\dfrac{1\times \dfrac{2}{1.33}\times 2\pi}{3}\\\Rightarrow \omega_i=3.14946\ rad/s$

The angular velocity when the diver left the board is 3.14946 rad/s

3 0

2 years ago

If you were trying to cross a river with the shortest possible time, would you aim your boat slightly upstream, directly across

Maru [420]

Slightly downstream for the shortest possible time

7 0

3 years ago

The kinetic energy of a baseball that with a mass of 0.140kg is 7 J. What is the baseballs velocity?

Nuetrik [128]

Answer:

10 m/s

Explanation:

Kinetic energy= $\frac{1}{2}$ mv² where m is mass and v is velocity.

We have to make v the subject so we should rearrange the equation

K= $\frac{1}{2}$ mv²

v²= $\frac{K}{0.5*m}$ (use algebra)

v²= 7/0.5×0.140

v²=100

v=√100

v=10 m/s

We can confirm this by using the kinetic energy formula.

K= $\frac{1}{2}$ ×0.140×10²

K= 7 J

Hence it is proved that velocity is 10 m/s

3 0

11 months ago