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3 years ago

These steps are followed when using the half-life of carbon-14 to determine

Physics

2 answers:

aniked [119]3 years ago

8 0

Answer:

C. B, A,C

Explanation:

Blizzard [7]3 years ago

4 0

Answer: a different one is a.b.c

Explanation: still for ape.x

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An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 137 ft at an angle of 31.0° abov

Zielflug [23.3K]

Answer:

Explanation:

We know that

Δr = r₁ - r₀

r₀ = 0 i + 0 j

r₁ = (162+137*Cos(31º)+137*Cos(-48º)) i + (0+137*Sin(31º)+137*Sin(-48º)) j = (371.1028 i - 31.2506 j) ft

Δr = r₁ - r₀ = (371.1028 i - 31.2506 j) - (0 i + 0 j) = (371.1028 i - 31.2506 j) ft

Magnitude:

Δr = √((371.1028)²+(-31.2506)²) = 372.4163 ft

Angle:

tan θ = (- 31.2506 / 371.1028) = -0.0839 ⇒ θ = tan⁻¹(-0.0839) = - 4.8135º

(below the horizontal).

8 0

4 years ago

A 57 kg skier starts from rest at a height of H = 27 m above the end of the ski-jump ramp. As the skier leaves the ramp, his vel

Hatshy [7]

Answer:

(a) $h=5.95m$

(b) h is the same

Explanation:

According to the law of conservation of energy:

$E_i=E_f\\U_i+K_i=U_f+K_f$

The skier starts from rest, so $K_i=0$ and we choose the zero point of potential energy in the end of the ramp, so $U_f=0$ . We calculate the final speed, that is, the speed when the skier leaves the ramp:

$mgH=\frac{mv^2}{2}\\v=\sqrt{2gH}\\v=\sqrt{2(9.8\frac{m}{s^2})(27m)}\\v=23\frac{m}{s}$

Finally, we calculate the maximum height h above the end of the ramp:

$v_f^2=v_i^2-2gh\\$

The initial vertical speed is given by:

$v_i=vsin\theta$

and the final speed is zero, solving for h:

$h=\frac{v_i^2}{2g}\\h=\frac{((23\frac{m}{s})sin(28^\circ))^2}{2(9.8\frac{m}{s^2})}\\h=5.95m$

(b) We can observe that the height reached does not depend on the mass of the skier

3 0

4 years ago

What are some of the physical benefits of playing basketball

Naya [18.7K]

Answer:

Promotes Cardiovascular Health. ...

Burns Calories. ...

Builds Bone Strength. ...

Boosts The Immune System. ...

Provides Strength Training. ...

Boosts Mental Development. ...

Develops Better Coordination And Motor Skills. ...

Develops Self-Discipline And Concentration.

Explanation:

8 0

3 years ago

Read 2 more answers

The latent heat of fusion of alcohol is 50 kcal/kg and its melting point is -54oC. It has a specific heat of 0.60 in its liquid

sashaice [31]

Answer:

Explanation:

To melt the alcohol

Heat needed = M . L = 2 . 25 = 50 kcal

To warm up the alcohol

Heat needed = M . sp. ht. . ∆t = 2 . 0.6 . 100 = 120 kcal

Total heat needed = 170 kcal

Assuming that 0.6 kcal/ kg / ˚C is the specific heat and that the answer is wanted in kcal ( a rather odd unit to be in use here.)

5 0

3 years ago

Suppose you swing a ball of mass (m) in a vertical circle on a string of length (L). As you probably know from experience, there

KATRIN_1 [288]

Answer:

a) $\omega =\sqrt{\dfrac{g}{L}}$

b)N= 21.29 rpm

Explanation:

Given that

Mass of the ball =m

Length of string = L

Lets take angular speed = ω

The centripetal force on the ball

F = m ω² L

To complete the circle ,at the top condition the force due to gravity should be equal to the centripetal force

Gravity force = mg

F= mg

m ω² L = m g

ω² L = g

$\omega =\sqrt{\dfrac{g}{L}}$

When L= 2 m

Lets take g =10 m/s²

$\omega =\sqrt{\dfrac{g}{L}}$

$\omega =\sqrt{\dfrac{10}{2}}$

ω = 2.23 rad/s

To convert in rpm

$\omega =\dfrac{2\pi N}{60}$

N=Speed in rpm

$2.23 =\dfrac{2\pi N}{60}$

N= 21.29 rpm

8 0

3 years ago