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11Alexandr11 [23.1K]
3 years ago
15

Miriam accidentally drops her cell phone during a call. It falls for 0.5 s before hitting the ground. What is the speed of the p

hone at 0.5 s? Assume only gravity is acting on it. A. 5 m's B. 10 m/s C. 20 m/s D. 0.5 m/s​
Physics
1 answer:
Flauer [41]3 years ago
6 0

Answer:

5 m/s

Explanation:

v = at

v = 9.8(0.5) = 4.9 m/s

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The heating element has a power of 2.5kW. The resistance of the heating is 17(ohms)
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Answer:

I = 12.12 A

Explanation:

P = 2.5 kw = 2500 w

formula

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2 years ago
To practice Problem-Solving Strategy 11.1 Equilibrium of a Rigid Body. A horizontal uniform bar of mass 2.7 kg and length 3.0 m
Zanzabum

Answer:

T_{1} = 14.88 N

Explanation:

Let's begin by listing out the given variables:

M = 2.7 kg, L = 3 m, m = 1.35 kg, d = 0.6 m,

g = 9.8 m/s²

At equilibrium, the sum of all external torque acting on an object equals zero

τ(net) = 0

Taking moment about T_{1} we have:

(M + m) g * 0.5L - T_{2}(L - d) = 0

⇒ T_{2} = [(M + m) g * 0.5L] ÷ (L - d)

T_{2} = [(2.7 + 1.35) * 9.8 * 0.5(3)] ÷ (3 - 0.6)

T_{2}= 59.535 ÷ 2.4

T_{2} = 24.80625 N ≈ 24.81 N

Weight of bar(W) = M * g = 2.7 * 9.8 = 26.46 N

Weight of monkey(w) = m * g = 1.35 * 9.8 = 13.23 N

Using sum of equilibrium in the vertical direction, we have:

T_{1} + T_{2} = W + w   ------- Eqn 1

Substituting T2, W & w into the Eqn 1

T_{1} + 24.81 = 26.46 + 13.23

T_{1} = <u>14.88</u> N

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