Please help me with these two multiple choice questions!

Calculate the average net force.

MrRa [10]

Answer:

<h2>given</h2>

mass = 3950 kg

speed= 25m/ sec

time= 10.5 sec

force

<h2>Solution</h2>

<h3>☄️Formula of force </h3>

$\fbox{f = m.a}$

To find the force we need to find the Acceleration first.

accleration= change in Velocity/time

accleration= 25/10.5

accleration= 2.38 m/sec²

put the value of accleration in the formula of force

force = Mass . accleration

force = 3950 x 2.38

<h3>☄️force = 9,401 Newton</h3>

3 0

3 years ago

A wave is approaching a barrier that has a small hole at the center. Which describes the change in the wave as it encounters the

garri49 [273]

B.The wave will bend or defract

diffraction is the phenomenon of bending of waves around the edge of the obstruction in its path of motion. this happens more strongly when the dimensions of the slit is comparable with the wavelength of the wavelength undergoing the diffraction process. hence the correct choice would be B

5 0

3 years ago

Read 2 more answers

when you drop a pebble from height h, it reaches the ground with kinetic energy k if there is no air resistance. from what heigh

marysya [2.9K]

Answer:

From the initial height h

Explanation:

When a material or substance is drop from a height h, it possesses potential energy, immediately it is dropped from that height, the potential energy is gradually converted to kinetic energy, it gets to a point where the potential energy equals the kinetic energy, as the material touches the ground, all potential energy has been converted to kinetic energy already

6 0

3 years ago

What is -37c on the Fahrenheit scale

Arisa [49]

-35 is the ans.wer.hope this hels

8 0

3 years ago

You throw a ball with a mass of 0.50 kg against a brick wall. It hits the wall moving horizontally to the left at 20 m/s and reb

Orlov [11]

Answer:

The value of impulse of the net force on the ball during its collision with wall is $I = 15\ kg \frac{m}{s}$