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3 years ago

If a hockey stick exerts a force of 40 N on a 0.5-kg puck, what will the

Physics

1 answer:

antoniya [11.8K]3 years ago

3 0

Answer:

B. 80 m/s²

Explanation:

F = ma

a = F/m = (40 N)/(0.5 kg) = 80 m/s²

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A ball is kicked horizontally from a 60 meter tall cliff at 10 m/s. How far from

o-na [289]

Hi there!

We can begin by deriving the equation for how long the ball takes to reach the bottom of the cliff.

$\large\boxed{\Delta d = v_it+ \frac{1}{2}at^2}}$

There is NO initial vertical velocity, so:

$\large\boxed{\Delta d= \frac{1}{2}at^2}}$

Rearrange to solve for time:

$2\Delta d = at^2\\\\t = \sqrt{\frac{2\Delta d}{g}}$

Plug in the given height and acceleration due to gravity (g ≈ 9.8 m/s²)

$t = \sqrt{\frac{2(60)}{(9.8)}} = 3.5 s$

Now, use the following for finding the HORIZONTAL distance using its horizontal velocity:

$\large\boxed{d_x = vt}\\\\d_x = 10(3.5) = \karge\boxed{35 m}$

6 0

3 years ago

A piano has a mass of 99 kg. What is the weight of the piano?

NemiM [27]

Answer:

$D.\ 970\ N$

Explanation:

Given:

Mass of Piano: 99kg

Required:

Calculate its weight

The weight of an object is calculate as thus;

$Weight = Mass\ (m) * Acceleration\ due\ to\ gravity\ (g)$

$m = 99kg$ and $g = 9.8m/s^2$

The formula becomes

$Weight = 99kg * 9.8m/s^2$

$Weight = 970.2\ kgm/s^2$

$Weight = 970.2\ N$

$Weight = 970\ N$ Approximated

Hence, the weight of the piano is 970N

8 0

3 years ago

Which object is completely opaque?

Pavel [41]

Answer:

Explanation:

light can not pass through it completely

7 0

3 years ago

a boy pulls 23 kg box with a 100 N force at 39 above a horizontal surface if the coefficient of kinetic friciton between the box

tatuchka [14]

Answer:

Total work done is 2606.08 J.

Explanation:

Given :

Mass of box , m = 23 kg .

Force applied , F = 100 N .

Angle from horizon , $\theta=39^o$ .

Coefficient of kinetic friction , $\mu=0.16$ .

Distance travelled by box , d = 34 m .

Now ,

Total work done = work done by boy + work done by friction.

$W=Fdcos\theta+f_sdcos\theta=Fd-\mu(mg) \\\\W=100\times cos39^o\times 34-0.16\times 23 \times 9.8 \\\\W=77.71\times 34-36.06=2606.08\ J.$

Hence , this is the required solution.

6 0

3 years ago

What happens when all of the elements collide at the same time?

Triss [41]

Answer:Some of the heavier elements in the periodic table are created when pairs of neutron stars collide cataclysmically and explode

Explanation:

5 0

2 years ago