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3 years ago

14. Which of the following is an example of changing acceleration?

Physics

1 answer:

Anna71 [15]3 years ago

5 0

Answer : d

Method : Changing acceleration is when a moving object changes the direction or speed.

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A car is moving north at 5.2 m/s2. Which type of motion do the SI units in this<br> value express?

irina [24]

Answer:

the SI unit (meter per second square) indicates a linear type of motion.

Explanation:

Given;

acceleration of the car, a = 5.2 m/s² North

the SI unit of the car, = m/s²

The SI unit of the given value (acceleration), indicates a linear type of motion.

Linear acceleration is the change in linear velocity with time. Also, the northwards direction indicates linear displacement of the car.

Therefore, the SI unit (meter per second square) indicates a linear type of motion.

7 0

3 years ago

Lolliguncula brevis squid use a form of jet propulsion to swim—they eject water out of jets that can point in different directio

romanna [79]

Answer:

a) t = 0.25 s, b) x = 0.075 m

Explanation:

a) For this exercise we will use kinematic relationships in one dimension

v = v₀ + a t

in the problem they indicate the initial velocity v₀ = 0.15 m / s, the final velocity v = 0.45 m / s and the acceleration of the squid a = 1.2 m / s²

t = $\frac{v -v_o}{a}$

we calculate

t = $\frac{0.45 - 0.15}{1.2}$

t = 0.25 s

b) We can also find the distance traveled during this acceleration

v² = v₀² + 2a x

x = $\frac{v^2 -v_o^2 }{2a}$

let's calculate

x = $\frac{0.45^2 - 0.15^2 }{2 \ 1.2}$

x = 0.075 m

6 0

3 years ago

Question is In Image Provided

KatRina [158]

Answer:

i would think the first two, but i cant be sure.

Explanation:

7 0

4 years ago

If you double the distance between you and the center of Earth, what happens to the strength of the gravitational field you expe

Lostsunrise [7]

Answer:

The strength of gravity decreases.

An example of that would be if you were in space; you float around because there's no gravity.

7 0

3 years ago

a car is moving 8.80 m/s when it begins to accelerate at 2.45 m/s^2. how much time does it take to trav 138m. please help me (':

Ulleksa [173]

Answer:

7.6 s

Explanation:

Considering kinematics formula for final velocity as

$v^{2}=u^{2}+2as$

Where v and u are final and initial velocities, a is acceleration and s is distance moved.

Making v the subject then

$v=\sqrt{u^{2}+2as}$

Substituting 8.8 m/s for u, 138 m for s and 2.45 m/s2 for a then

$v=\sqrt{8.8^{2}+2*2.45*138}\\v=27.45 m/s$

Also, v=u+at and making t the subject of the formula

$t=\frac {v-u}{a}$

Substituting 27.45 m/s for v, 8.8 m/s for u and 2.45 m/s for a then

$t=\frac {27.45-8.8}{2.45}=7.6122448979591\approx 7.6s$

Therefore, it needs 7.6 seconds to travel

7 0

3 years ago