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3 years ago

An object is moving east, and its velocity changes from 66 mvs to 26 mvs in 10 seconds. Which describes the

Physics

1 answer:

STALIN [3.7K]3 years ago

6 0

Answer:

negative acceleration of 4m/s²

Explanation:

Given parameters:

Initial velocity = 66m/s

Final velocity = 26m/s

Time taken = 10s

Unknown:

Description of the acceleration = ?

Solution:

Acceleration is the rate of change of velocity with time.

It is mathematically expressed as;

acceleration = $\frac{v - u}{t}$

v is the final velocity

u is the initial velocity

t is the time taken

Now insert the parameters and solve;

Acceleration = $\frac{26 - 66}{10}$ = -4m/s²

So, we see a negative acceleration of 4m/s²

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Find the velocity of a wave of period 2 s and wavelength 0.5m. *

Helen [10]

Answer:

The velocity of wave is 0.25m/s

Explanation:

First, you have to find the fequency using the formula, F = 1/Time :

$f = \frac{1}{t}$

Let t = 2s,

$f = \frac{1}{2}$

$f = 0.5Hz$

Next, you have to use speed formula, V = f×λ :

Let f = 0.5Hz,

Let λ = 0.5m,

$v = 0.5 \times 0.5$

$v = 0.25$

4 0

3 years ago

if u connect 3 resistors, having values 2ohm, 3ohm, 5ohm in parallel, will the value of total resistance of will be 2ohm or grea

Tju [1.3M]

If u want only WHether the total resistance is less than 2 or less than 5 or more than 5 ohms: there is a Simple way.

When you connect resistances in parallel, resultant resistance is always smaller than all of them. So it is less than 2 ohms.

4 0

4 years ago

Read 2 more answers

A sample of gas, initially with a volume of 1.0 L, undergoes a thermodynamic cycle. Find the work done by the gas on its environ

Dafna1 [17]

Answer:

(a) W = 3293 J = 3.293 KJ

(b) W = 0 KJ

(d) W = 0 KJ

Net Work = 2.786 KJ = 2786 J

Explanation:

(a)

The work done is given as:

$W = P\Delta V\\W = P(V_2-V_1)$

where,

P = Constant Pressure = (6.5 atm)(101325 Pa/1 atm) = 6.59 x 10⁶ Pa

V₁ = initial volume = (1 L)(0.001 m³/1 L) = 0.001 m³

V₂ = final volume = (6 L)(0.001 m³/1 L) = 0.006 m³

Therefore,

$W = (6.59\ x\ 10^6\ Pa)(0.006\ m^3-0.001\ m^3)$

W = 3293 J = 3.293 KJ

(b)

Since the volume is constant in this stage. Therefore,

ΔV = 0

As a result:

W = 0 KJ

(c)

The work done is given as:

$W = P\Delta V\\W = P(V_2-V_1)$

where,

P = Constant Pressure = (1 atm)(101325 Pa/1 atm) = 1.01 x 10⁵ Pa

V₁ = initial volume = (6 L)(0.001 m³/1 L) = 0.006 m³

V₂ = final volume = (1 L)(0.001 m³/1 L) = 0.001 m³

Therefore,

$W = (1.01\ x\ 10^5\ Pa)(0.001\ m^3-0.006\ m^3)$

W = -506.6 J = -0.507 KJ

negative sign show that the work is done on the gas by the environment.

(d)

Since the volume is constant in this stage. Therefore,

ΔV = 0

As a result:

W = 0 KJ

Net work will be the sum of all the works:

Net Work = 3.293 KJ + 0 KJ - 0.507 KJ + 0 KJ

Net Work = 2.786 KJ = 2786 J

4 0

3 years ago

When the mallet hits the ball with an action force, the ball exerts a reaction 1 force on the mallet as explained by: 1) Newton'

aliina [53]

Answer:it should be Newton’s second law

Explanation: lmk if I’m wrong

5 0

3 years ago

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person walks in the following pattern: 2.3 km north, then 2.5 km west, and finally 5.4 km south. (a) How far and (b) at what ang

Lana71 [14]

Answer

given,

Distance travel = 2.3 km north; 2.5 km west; 5.4 km south

distance travel by the person = 2.3 + 2.5 + 5.4

= 10.2 Km

angle at which bird fly from the starting point

$tan \theta = \dfrac{y}{x}$

$tan \theta = \dfrac{-3.1}{-2.5}$

$tan \theta = 1.24$

$\theta =tan^{-1}(1.24)$

$\theta =51.12^0$

Angle from the original position is 51.12° S of W

7 0

3 years ago

Read 2 more answers