All categories

3 years ago

Plzzzzzzzzz help me will mark u brainest

Physics

2 answers:

Andrew [12]3 years ago

5 0

Answer:

Explanation:

acceleration = change in speed / change in time

for 1, speed increases over time, so positive acceleration

for 3, speed decreases over time, so negative acceleration (or deceleration)

babymother [125]3 years ago

4 0

The answer is B, because 1 is acceleration and 3 is deceleration. 2 and 4 are staying at a constant speed which means it isn’t speeding or slowing but it’s staying the same.

You might be interested in

An electric fence displays a warning sign about the voltage and amperage of the fence. How would amperage and voltage affect the

Lorico [155]

V = volts
I = amps 
P = rate or energy transfer (power) 
and 
P = V * I

4 0

3 years ago

A small plane flies at 200 km/h in still air. If the wind blows directly out of the west at 50.0 km/h, (a) in what direction mus

GenaCL600 [577]

Answer:

a)θ=74.03° (N-E)

b)t=1.56 hr

Explanation:

Given that

Plane speed = 200 km/h

Wind speed = 55 km/h

Now from diagram

V is the resultant velocity of plane

$200^2=V^2+55^2$

V=192.28 km/h towards north

From triangle ABC

$cos\theta =\dfrac{55}{200}$

θ=74.03°

Given that

d=300 km

We know that

d = V x t

300 = 192.28 x t

t=1.56 hr

7 0

3 years ago

Two long parallel wires that are 0.30 m apart carry currents of 5.0 A and 8.0 A in the opposite direction. Find the magnitude of

olya-2409 [2.1K]

To solve this problem we will apply the concepts related to electromagnetic force. This force is defined as the product between the free space permeability constant, the product of the two currents found, at the rate of the distance that separates them. In this way mathematically it can be given as,

$F = \frac{\mu_0 I_1I_2 }{2\pi d}$

Here,

$\mu_0$ = Permeability of free space

I = Each current

d = Distance

Replacing with our values,

$F = \frac{(4\pi *10^{-7})(5)(8)}{2\pi (0.3)}$

$F = 2.7*10^{-5} N$

Therefore the force is $2.7*10^{-5}N$

5 0

3 years ago

A 22kg box slides down a 30.0 degree incline. If there is no friction, what is the acceleration of the box?

Rashid [163]

Answer:

Acceleration of the box is 4.9 m/s².

Explanation:

The free body diagram is shown below.

The weight of the body can be resolved into two mutually perpendicular components as shown. The force responsible for sliding motion of the box along the incline is due to $mg\sin \theta$ acting along the incline.