3 years ago

Which of the following correctly describes the relationship between speed and velocity?

Physics

2 answers:

Harlamova29_29 [7]3 years ago

5 0

It is the second provided answer.

Speed is the change in distance over time; velocity is speed plus direction.

11111nata11111 [884]3 years ago

5 0

Answer:

The answer is B. I took physics.

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Write an expression for the potential energy UD of a particle when it is at a distance D from the force center, in terms of B an

nadezda [96]

Answer:

E+mc+UD-3

Explanation:

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4 years ago

A curve in a stretch of highway has radius R. The road is not banked in any way. The coefficient of static friction between the

adelina 88 [10]

Answer:

maximum possible velocity = $\sqrt{ugR}$

Explanation:

centripetal acceleration when the car is going in the circle must be less than the maximum friction for the car to not slip.

centripetal acceleration $\frac{mv^{2}}{r}$

where v is the velocity of car and r is the radius of circle

maximum friction = umg

where u is the coefficient of static friction.

therefore $umg\geq \frac{mv^{2}}{R}$

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3 years ago

A transformer consists of 290 primary windings and 824 secondary windings. Part A: If the potential difference across the primar

jasenka [17]

Answer:

Part 1) Voltage in secondary windings is 61.08 Volts

Part 2) Current in secondary windings is 0.53 Amperes

Explanation:

The potential developed in the primary and secondary winding of a transformer are related as

$\frac{N_{p}}{N_{s}}=\frac{V_{p}}{V_{s}}$

where

Np no of turns in primary coil

Ns no of turns in secondary coil

Vp Voltage of turns in primary coil

Vs Voltage of turns in secondary coil

Applying values in the formula we get

$\frac{290}{824}=\frac{21.5}{V_{s}}\\\\\therefore V_{s}=21.5\times \frac{824}{290}=61.08V$

Part 2)

Using Ohm's law the current is given by

$I=\frac{V_{s}}{R}\\\\I=\frac{61.089}{115}=0.53A$

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3 years ago

A steel ball is dropped to a wood table. What are three ways in which energy is wasted when the ball bounces?

hodyreva [135]

Answer:1. Inelastic deformation of wood and steel

2.thermal energy: hear from wood and steel

3.acoustic energy

Explanation:

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3 years ago

The longer the wavelength, the lower the frequency, and the lower the energy. Lesson 4.07 True False

jenyasd209 [6]

It’s true. longer wavelength means a lower frequency, and a shorter wavelength means a higher frequency!

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3 years ago