All categories

3 years ago

Buses travel at 25 m/s then decelerate steadily. It comes to a complete stop in 40 second. What is its acceleration?

1 answer:

7 0

Given is the velocity of the bus at 25 meters per second. Then it decelerates steadily. It stops after 40 seconds. To calculate for the acceleration, use this formula:

a = (vf - vo) / t

vf = 0 m/s (complete stop)
vo = 25 m/s
t = 40 s

Therefore,

a = (0 - 25) m/s / 40 s

a = - 0.625 m/s^2

<span />

You might be interested in

If a star's radiation peaks in the ultraviolet region of the spectrum, you would not be able to see it. true or false.

slega [8]

the answer would be false

hope I helped and goodluck

6 0

3 years ago

Read 2 more answers

Two boxers are fighting. Boxer 1 throws his 5 kg fist at boxer 2 with a speed of 9 m/s.

Sladkaya [172]

Answer:

0.001 s

Explanation:

The force applied on an object is equal to the rate of change of momentum of the object:

$F=\frac{\Delta p}{\Delta t}$

where

F is the force applied

$\Delta p$ is the change in momentum

$\Delta t$ is the time interval

The change in momentum can be written as

$\Delta p=m(v-u)$

where

m is the mass

v is the final velocity

u is the initial velocity

So the original equation can be written as

$F=\frac{m(v-u)}{\Delta t}$

In this problem:

m = 5 kg is the mass of the fist

u = 9 m/s is the initial velocity

v = 0 is the final velocity

F = -45,000 N is the force applied (negative because its direction is opposite to the motion)

Therefore, we can re-arrange the equation to solve for the time:

$\Delta t=\frac{m(v-u)}{F}=\frac{(5)(0-9)}{-45,000}=0.001 s$

4 0

3 years ago

1 point

RoseWind [281]

Answer:

Bacteria and Fungus

6 0

4 years ago

If dye x has a molar absorptivity, ε = 4.50 x 104 cm-1 m-1, at a certain wavelength, what concentration of the dye, in a 1.00 cm

NeTakaya

For this problem, the working equation should be used from the Beer's Law:

A = ∈lc,
where
A is the absorbance
∈ is the molar absorptivity
l is the length of path of the cuvette diameter
C is the concentration of the sample placed inside the cuvette

Substituting the values:

0.417 = (4.50×10⁴ cm⁻¹ M⁻¹<span>)(1 cm)(C)
Solving for C:
C = 9.27</span>×10⁻⁶ M

8 0

4 years ago

What is the speed of the tip of the hour hand on a clock?

just olya [345]

Explanation: Technically the speed is an inch a second.

7 0

4 years ago