All categories

3 years ago

When a rubber ball is thrown against a wall, energy is transferred and transformed. Select the

Physics

1 answer:

Nikolay [14]3 years ago

3 0

Answer:

B. When the ball is released, the thrower's arm transfers its energy to the ball.

You might be interested in

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

2 years ago

A group of bike riders took a 4 hour trip. During the first 3 hours, they traveled a total of 50 km, but

zlopas [31]

Answer:

15km/hr

Explanation:

The average speed for the entire trip is the sum of the total distance traveled divided by the total time of the trip.

Total time = 4hr

distance for the first 3hrs = 50km

distance for the last 1hr = 10km

Total distance = 50km + 10km = 60km

Now;

Average speed = $\frac{total distance }{time taken}$

Insert the parameters and solve;

Average speed = $\frac{60km}{4hr}$ = 15km/hr

7 0

3 years ago

A weightlifter lifts a weight of 500 N from the ground over her head, a distance of 1.8 m. How much work has been done to move t

Maksim231197 [3]

Answer is 900N

Hope this helps c:

3 0

2 years ago

Stephen throws a 0.46 kg football at a speed of 14 m/s and it goes through the goal posts 2.4 m above where he threw it. What is

Dovator [93]

Answer:
$\\ \\ 0.46 \times 14 {2 }^{2} = 90.16 \\$

5 0

2 years ago

A truck is carrying a 120-kg refrigerator, which is 2.20 m tall and 85.0 cm wide has its center of mass at its geometrical cente

dsp73

Answer:

The maximum acceleration that the truck can have before the refrigerator begins to tip over is 3.79 m/s^2

Explanation:

Mass of refrigerator, m = 120 kg

Refrigerator height, h = 2.2 m

Width of refrigerator, w = 85 cm = 0.85 m

acceleration due to gravity, g = 9.81 m/s^2

From the principles of moments, the refrigerator will start to tip at the point when the forces are balanced at the edge of the width.

Therefore, taking moments about the edge, where the weight acts at the geometric center, we have

m×g×w/2 = m×a×h/2

120×9.81×0.85/2 = 120×a×2.2/2

or a = 3.79 m/s^2

8 0

2 years ago