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Nookie1986 [14]
3 years ago
14

6. A physics book slides off a horizontal table top with a speed of 1.25m/s. It strikes a floor in 0.4s.

Physics
1 answer:
aliina [53]3 years ago
8 0

Answer:

4.11 m/s

Explanation:

Given:

v₀ₓ = 1.25 m/s

aₓ = 0 m/s²

v₀ᵧ = 0 m/s

aᵧ = -9.8 m/s²

t = 0.4 s

Find: v

First, in the x direction:

vₓ = aₓt + v₀ₓ

vₓ = (0 m/s²) (0.4 s) + 1.25 m/s

vₓ = 1.25 m/s

And in the y direction:

vᵧ = aᵧt + v₀ᵧ

vᵧ = (-9.8 m/s²) (0.4 s) + 0 m/s

vᵧ = -3.92 m/s

The net speed is found with Pythagorean theorem:

v² = vₓ² + vᵧ²

v² = (1.25 m/s)² + (-3.92 m/s)²

v = 4.11 m/s

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3 years ago
An extension cord is used with an electric weed trimmer that has a resistance of 17.9 Ω. The extension cord is made of copper (r
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Answer:

(a) R_{c}=0.87ohms

(b) V_{T}=114.44V

Explanation:

Part (a)

The total length of copper cord L=86.3 m

The cross sectional area A=1.71×10⁻⁶m²

The resistivity of copper p=1.72×10⁻⁸Ω

Thus the resistance of extension cord is

R_{c}=p\frac{L}{A}\\R_{c}=(1.72*10^{-8} )\frac{86.3}{1.71*10^{-6}}\\R_{c}=0.87ohms

Part (b)

The resistance of trimmer Rt=17.9 ohms

When voltage of 120V is applied then the current I is passing through series circuit is

I=\frac{120V}{R_{c} +R_{T} }\\I=\frac{120V}{0.87 +17.9 } \\I=6.4A

Thus the voltage across the trimmer is:

V_{T}=IR_{T}\\V_{T}=(6.4)*(17.9)\\V_{T}=114.44V

8 0
3 years ago
The five general principles from the APA are meant to __________. A. be enforceable rules B. be posted in every office C. guide
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The answer is C guide and inspire good conduct
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3 years ago
A submersible pump is put under the water at the bottom of a well and is used to push water up through a pipe. What minimum outp
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Answer:

695800 N/m^2 or Pa

Explanation:

Height of the water from the ground H  =  71 m

Acceleration due to gravity g =9.8 m/s^2

density of water ρ= 1000 kg/m^3

The minimum output gauge pressure to make water reach height H

P= ρgH

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3 years ago
A car with a mass of 600 kg is traveling at a velocity of 10 m/s. How much kinetic energy does it have?
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Answer:

KE = 30,000 J

Explanation:

KE = \frac{1}{2} mv²

KE = \frac{1}{2} (600)(10)²

KE = \frac{1}{2} (600)(100)

KE = \frac{1}{2} (60000)

KE = 30,000 J

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3 years ago
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