5. The condition of the road surface affects total stopping distance.<br>A. true<br>B. false

The law of Conservation of energy best describes which of the following:

Natasha_Volkova [10]

Answer:

All the above

Explanation:

3 0

2 years ago

Which of the following statements about motion are true? Select all that apply.

Blababa [14]

Answer:

A, C, D

Explanation:

Newton's first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

and according to Newton's 4th law: An object that is at rest will stay at rest unless a force acts upon it. An object that is in motion will not change its velocity unless a force acts upon it.

4 0

3 years ago

Two microwave frequencies are authorized for use in microwave ovens, 890 and 2500 MHz. Calculate the wavelength (in cm) of each.

yulyashka [42]

Answer:

34 cm and 12 cm

Explanation:

Wavelength: This can be defined as the distance in meter required to complete one circle.

The formula for the wavelength of a wave is given as,

λ = v/f..................... Equation 1

Where λ = wavelength, v = velocity of a microwave, f = frequency.

For The first micro wave,

λ = v/f

Given: f = 890 MHz = 890000000 Hz = 8.9×10⁸ Hz

Constant: Note: All electromagnetic wave moves with same speed v = 3×10⁸ m/s.

Substitute into equation 1

λ = 3×10⁸/8.9×10⁸

λ = 0.34 m.

λ = 34 cm

For the second micro wave,

λ = v/f..................... Equation 1

given: f = 2500×10⁶ Hz = 2.5×10⁹ Hz, v = 3×10⁸ m/s.

Also substitute into equation 1

λ = 3×10⁸ /(2.5×10⁹)

λ = 1.2×10⁻¹ m

λ = 12 cm.

6 0

3 years ago

The diagram shows a positive charge moving in a magnetic field. a field of circles labeled b. there is a positively charged part

lesya692 [45]

The magnetic force will be point upwards in perpendicular direction to the field.

<h3>What is the direction of magnetic force?</h3>

The direction of the magnetic force on negative charge occurs in the opposite direction while it is directed to the positive charge direction.

From the given image and description, the positively charged particle with a velocity vector, v is pointing left, thus we can conclude that the magnetic force will be point upwards in perpendicular direction to the field.

Learn more about magnetic force here: brainly.com/question/12488283

#SPJ4

4 0

2 years ago

A 450.0 N, uniform, 1.50 m bar is suspended horizontally by two vertical cables at each end. Cable A can support a maximum tensi

bogdanovich [222]

Answer:

1) $W_{object} = 400 N$