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3 years ago

B. Solve the following problem.

Physics

1 answer:

NemiM [27]3 years ago

4 0

Answer:

-2.83m/s^2

Explanation:

the object is decelerating because it's moving from 8.5 to rest (0)

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if forces acting on an object are unbalanced, which factors may result from an unbalanced force? Check all that apply. The net f

Alchen [17]

The net force is negative, and there is a change in motion.

8 0

4 years ago

Read 2 more answers

Americium-241 is a radioactive substance used in smoke detectors. The half life of americium is 432 years. If a smoke detector i

romanna [79]

Answer:

0.5 g

Explanation:

The half-life of a radioactive isotope is the time it takes for a certain amount of that isotope to halve.

In this case, we have an isotope of Americium-241, which has a half-life of

$\tau = 432 y$

This means that after 1 half-life (432 years), there will be an amount of americium equal to half its initial amount.

In this problem, the initial amount of americium is

$m_0 = 1 g$

Therefore, after 432 years (1 half-life), the amount of americium left will be half:

$m(432y) = \frac{m_0}{2}=0.5 g$

7 0

3 years ago

In principle, when you fire a rifle, the recoil should push you backward. How big a push will it give? Let's find out by doing a

MaRussiya [10]

Answer:

$v= \frac{10\times10^{-3} V}{70}$ m/s

Explanation:

Assumption: bullet leaves the muzzle at a speed of V m/s

and velocity of push received by the man be v m/s

According to newton's third law to every action there is always an equal and opposite reaction.

therefore,

mass of man× velocity = mass of bullet×its velocity

⇒70×v= 10×10^-3 ×V

solving the above eqaution we get

therefore $v= \frac{10\times10^{-3} V}{70}$ m/s

7 0

4 years ago

Block A, with a mass of 4 kg, is moving with a speed of 2 m/s while Block B, with a mass of 8.4 kg, is moving in the opposite di

dybincka [34]

Answer:

The center of mass move with the velocity of -3.487 m/s.

Explanation:

Given values of block A.

Mass of block A, (M1) = 4 kg

Speed of block A, (V1) = 2 m/s

Given values of block B.

Mass of block B, (M2) = 8.4 kg

Speed of block B, (V2) = -6.1 m/s

Below is the formula to find the velocity of center of mass.

$Velocity = \frac{M1V1 + M2V2}{M1 + M2} \\$

$= \frac{4 \times 2 + 8.4 \times (-6.1) }{4 + 8.4} \\$

$= \frac{- 43.24}{12.4}\\$

$= - 3.487 m/s$

7 0

3 years ago

Will mark brainliest! Please help!

djverab [1.8K]

Answer:

30 seconds

Explanation:

A = A02^-(t/hl)

--> ln(A/A0) = -(t/hl)ln2

solving for hl,

hl = -t x ln2 /ln(A/A0)

= -(60 min)xln2/ln(50/200)

= 0.5 min or 30 seconds

3 0

3 years ago