A car covers 100 km in 2 h , what is the speed of the car.

Alberto is walking east at 10 m/s from his house to his grandma's house. It takes him 30s to walk 50 m/s more to his grandma's h

Pachacha [2.7K]

Answer:

Acceleration = 1.33m/s² East

Explanation:

Given the following data;

Initial velocity = 10m/s

Final velocity = 50m/s

Time = 30secs

To find the acceleration;

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

$Acceleration (a) = \frac{final \; velocity - initial \; velocity}{time}$

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

Where,

a is acceleration measured in $ms^{-2}$

v and u is final and initial velocity respectively, measured in $ms^{-1}$

t is time measured in seconds.

Substituting into the equation, we have;

$a = \frac{50 - 10}{30}$

$a = \frac{40}{30}$

Acceleration = 1.33m/s² East

3 0

3 years ago

Concept Development

Ostrovityanka [42]

Answer:

The answer is below

Explanation:

The main difference between a liquid and a gas is that when a liquid is under pressure, its volume "won't change apparently. The reason is that the distance between the molecules of a liquid is relatively small, and the molecules of a liquid extensively withstand the compressive forces. This is similar to the distance between the molecules of a solid."

3 0

3 years ago

Consider the direction field of the differential equation dy/dx = x(y − 6)2 − 4, but do not use technology to obtain it. Describ

Alona [7]

Answer:

The slopes shows that the direction of the field is from -2 to +2, with three point charges, q₁, q₂ and q₃ at -2, 0 and +2 respectively.

Explanation:

Given;

The slope, dy/dx = 2x(y-6) - 4

2x(y-6) - 4 = 2xy - 12x - 4, divide through by 'x'

dy/dx = 2y -12 - 4/x

The slopes of the linear elements on the lines, x =0, y = 5, y = 6, y = 7.

At x = 0, and y = 5

dy/dx = 2y -12 - 4/x

dy/dx = 2(5) - 12 = -2

At x = 0, and y = 6

dy/dx = 2y -12 - 4/x

dy/dx = 2(6) - 12 = 0

At x = 0, and y = 7

= 2y -12 - 4/x

dy/dx = 2(7) - 12 = 2

Therefore, the slopes shows that the direction of the field is from -2 to +2, with three point charges, q₁, q₂ and q₃ at -2, 0 and +2 respectively.

5 0

3 years ago

Which of the following actions would make a pulse travel faster along a stretched string? More than one answer may be correct. I

MaRussiya [10]

Answer:

Option d and e are correct.

Explanation:

The expression for velocity of pulse in a stretched string can be given as follows

v = $\sqrt{\frac{T}{m} }$

where T is tension in the string , m is mass of string per unit length.

Use of lighter string of the same length, under the same tension amounts to higher m so velocity will decrease. Hence option d is correct.

Similarly, v is directly proportional to square root of tension. So if we increase tension , velocity also increases. So option e ) is correct.

5 0

4 years ago

People who have color vision deficiency typically lack one or more of the three cones that are sensitive to a particular wavelen

DIA [1.3K]

This is true
People who have color vision deficiency typically lack one or more of the three cones that are sensitive to a particular wavelength.

5 0

4 years ago

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A car covers 100 km in 2 h , what is the speed of the car.​

A car covers 100 km in 2 h , what is the speed of the car.