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3 years ago

How is speed determined?

Physics

1 answer:

enot [183]3 years ago

7 0

Speed equals distance divided by time (Speed=Distance/Time).

For example if it takes someone three minutes to go three miles their speed is one mile a minute.

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Two cars are driving at the same constant speed on a straight road, with car 1 in front of car 2. car 1 suddenly starts to brake

Ganezh [65]

Maths delivers! Braking distance ... If the car is initially travelling at um/s, then the stopping distance d m ... the speed of the car at the instant the brakes are applied. ... An object with constant acceleration travels the same distance as it would ... We start with the second equation of motion:.

4 0

4 years ago

A book is sitting on a desk. What best describes the normal force acting on the book?

Sladkaya [172]

My best guess would be:

"A force equal in magnitude but opposite in direction"

However I assume that this question is multiple choice, by the way it is introduced. Therefore it would be helpful if these options were also displayed - hence take this as my best guess only.

5 0

3 years ago

Read 2 more answers

A 0.40 kg object is attached to a spring with force constant 157 N/m so that the object is allowed to move on a horizontal frict

nirvana33 [79]

Answer:

Part a)

$F = 26.7 N$

Part b)

$a = 66.7 m/s^2$

Explanation:

Part a)

Force on the object due to spring force is given as

$F = kx$

here we know that

$k = 157 N/m$

$x = 0.17 m$

so we have

$F = 157\times 0.17$

$F = 26.7 N$

Part b)

Acceleration of the object is given as

$a = \frac{F}{m}$

$a = \frac{26.7}{0.40}$

$a = 66.7 m/s^2$

8 0

3 years ago

At Magic Mountain there is a ride in which people stand up against the inside wall of a large cylinder of radius 3 m. The cylind

mafiozo [28]

Answer:

0.1308

Explanation:

To keep the rider from sliding down, then the friction force $F_f$ must at least be equal to gravity force $F_p$

$F_f = F_p$

$\mu N = mg$

where μ is the coefficient, N is the normal force acted by the rotating cylinder, m is the mass of a person and g = 9.81 m/s2 is the gravitational acceleration.

According to Newton's 3rd and 2nd laws, the normal force would be equal to the centripetal force $F_c$ , which is the product of centripetal acceleration $a_c$ and object mass m