All categories

3 years ago

Select the correct answer.

Physics

2 answers:

TEA [102]3 years ago

4 0

OA the speed will increase four times

VMariaS [17]3 years ago

3 0

OA would be the correct answer

You might be interested in

As you ride a bicycle on the sidewalk with a speed of

mixer [17]

Answer:

1.2 seconds

Explanation:

distance = ((final speed + initial speed) * time)/2

Here given:

distance: 3.8 meter

initial speed: 6.4 m/s

final speed: 0 m/s

Solving steps:

3.8 = ((0 + 6.4) * time))/2

3.8 = 3.2(time)

time = 3.8/3.2

time = 1.1875 seconds ≈ 1.2 seconds

5 0

1 year ago

A model train traveling at a constant speed around a circular track has a constant velocity

TiliK225 [7]

A model train traveling at a constant speed around a circular track has a constant velocity. FALSE.
Hope this helps you!

3 0

3 years ago

A certain elevator cab has a total run of 198 m and a maximum speed is 317 m/min, and it accelerates from rest and then back to

tester [92]

Answer:

Explanation:

Given

Total run=198 m

maximum speed=317 m/min=5.28 m/s

acceleration $=1.11 m/s^2$

(a)Distance traveled while accelerating

$v^2-u^2=2as$

$(5.28)^2-0=2\times 1.11\times s$

s=12.57 m

time taken

v=u+at

$5.28=0+1.11\times t$

t=4.75 s

(b)Time taken to cover 198 m

if car takes 12.57 m & 4.75 s to reach max speed so it also takes 12.57 m and 4.75 s to stop from max speed

Distance traveled with max speed=198-25.14=172.86 m

time taken $=\frac{172.86}{5.28}=32.73 s$

total time=4.75+32.73+4.75=42.25 s

7 0

2 years ago

Explain how living things such as people and trees are different from non living things such as rocks and tents

Musya8 [376]

The difference between living things and nonliving things is little things that we call is senses like sight, taste, touch, smell, and hearing. For example a human or animal can react to someone or something touching them. For a nonliving thing such as a rock can't react to someone touching them unless u force them to.

5 0

3 years ago

Read 2 more answers

In the Hunger Games movie, Katniss Everdeen fires a 0.0200-kg arrow from ground level to pierce an apple up on a stage. The spri

egoroff_w [7]

Answer:

a) $v=99.8584\ m.s^{-1}$

b) $v'=99.366\ m.s^{-1}$

Explanation:

Given:

mass of the arrow, $m=0.02\ kg$

stiffness constant of the bow, $k=330\ N,m^{-1}$

distance of pulling back the arrow on the bow from its mean position, $\Delta x=0.55\ m$

height of the apple targeted, $h=5\ m$

<u>Force on the arrow due to the stiffness of the bow:</u>

$F=k.\Delta x$

$F=330\times 0.55$

$F=181.5\ N$

Now the acceleration of the arrow upwards:

$a=\frac{F}{m}$

$a=\frac{181.5}{0.02}$

$a=9075\ m.s^{-2}$

a) For the course of motion when the arrow leaves the bow after the stretch is relaxed we consider that the arrow left the bow after its string goes to the mean position. During this phase the arrow also faces gravity in the downward direction.

Using the equation of motion:

$v^2=u^2+2(a-g).\Delta x$