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Sedaia [141]
3 years ago
10

Hi i have homework can you help me

Physics
1 answer:
soldier1979 [14.2K]3 years ago
6 0

Explanation:

The particle will be at rest when its velocity v(t) is equal to zero. Recall that the velocity is simply the derivative of the position x(t) with respect to time:

v(t) = \dfrac{dx}{dt}

Since x(t) = t^2 - 2t + 2

then

v(t) = \dfrac{d}{dt}(t^2 - 2t + 2) = 2t - 2 = 0

Solving for t, we find that the particle will be at rest at

t = 1\:\text{s}

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A mosquito of mass 0.15 mg is found to be flying at a speed of 50 cm/s with an uncertainty of 0.5 mm/s. (a) How precisely may it
amid [387]

Answer:

a) Δx = t 0.05 + 0.5

,  Δx = 0.5 cm, b)  Do not present any problem

Explanation:

The kinematic equation for constant speed is

          v = x / t

          x = v t

a) the uncertainty can be calculated with

          Δx = dx /dv Δv + dx /dt Δt

          Δx = t Δv + v Δt

Speed ​​is

         v = (50.00 ± 0.05) cm / s

     

The most common uncertainty for the time of Δt = 0.01 s

    We replace

           Δx = t 0.05 + 50 0.01

           Δx = t 0.05 + 0.5

We must know the time to have an explicit value, if we assume that the measure was t = 1s

           Δx = 0.5 cm

b)

Do not present any problem since its value is not very small, we must take as soon as the quantum effects and the velocity are not so high that we must take into account the relativistic effects

5 0
3 years ago
The heating element of a water heater in an apartment building has a maximum power output of 37 kW. Four residents of the buildi
kkurt [141]

Answer:

maximum possible temperature is 34.088°C

Explanation:

Given data

power output Q = 37 kW

volume flow rate = 11 x 10^-5 m3/s

temperature t = 14°C

to find out

maximum possible temperature T

solution

we can say

total water volume  = 4 residents  × volume flow

total water volume = 4 × 11 x 10^-5  = 44 × 10^-5 m³/s

so we say total water mass = 1000 × volume

total water mass = 1000 kg/m³ ×  44 × 10^-5  

total water mass = 0.44 kg

we know

dQ/dt = (dm/dt)× (S)× ( T - t)

so here we know specific heat of water S = 4.186 joule/gram °C

37 = 0.44 × 4.186 × (T-14)

T = 34.088°C

maximum possible temperature is 34.088°C

3 0
3 years ago
Asha walks 15 m west, then 20 m north, then 15 m east. Calculate the distance and displacement
Norma-Jean [14]

Answer:

<em>Asha traveled a distance of 50 m</em>

<em>The displacement is 20 m north.</em>

Explanation:

<u>Distance and Displacement </u>

A moving object constantly travels for some distances at defined periods of time. The total moved distance is the sum of each individual distance the object traveled. It can be written as:

dtotal=d1+d2+d3+...+dn

This sum is obtained independently of the direction the object moves.

The displacement only takes into consideration the initial and final positions of the object while moving. The displacement, unlike distance, is a vectorial magnitude and can even have magnitude zero if the object starts and ends the movement at the same point.

Asha walks 15 m west, 20 m north, and 15 m east. The total distance is

dt=15 m + 20 m + 15 m = 50 m

Asha traveled a distance of 50 m

Note the final position is 20 m above the initial position since she goes 15 m west and 15 m east. Thus the displacement is 20 m north.

5 0
3 years ago
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