What force is necessary to accelerate a 70-kg object at a rate ifm4.2 m/s

Answers

Answer 1

Answer: F = ma
F = force
m = mass
a = acceleration

4.2 m/s = a
70 kg = m
F = ?

F = 4.2*70
F = 294 Newtons

Answer would then be : Force = 294 N

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as a drivers vehicle approaches an intersection at 20 m/s the driver applies the brakes in order to stop creating a uniform acceleration of 2.3 m² calculate the time required to stop

Answers

Answer:

8.70 seconds.

Explanation:

1. Use the kinematic equation: v = u + at,

v = final velocity

u = initial velocity

a = acceleration

t = time.

Find variables and numbers:

v = ?

u = 20 m/s

a = -2.3 m²

v = 0 m/s

Rearrange values: t = (v - u) / a.

Plugging in the values: t = (0 - 20) / (-2.3) = 20 / 2.3

Whats the similarities of rogue waves and tsunamis

Answers

Rogue wave is caused in open water not caused by earthquake. Tsunami is caused by an earthquake, bottom of the ocean/water.

Answer:

they are dangrous to boats

Explanation:

The weather station has issued a warning because there is a tornado in your area. It is traveling northwest at 30 miles per hour. This information describes the tornado's

Answers

The weather station has issued a warning because there is a tornado in your area. It is traveling northwest at 30 miles per hour. This informationdescribes the tornado's velocity, because velocity includes speed and direction.

In the water cycle what state of matter is rain

Answers

Liquid is the answer

liquid, the states of matter are solid, liquid and gas

two pendulums of lengths 100cm and 110.25cm start oscillating in phase. after how many oscillations will they again be in same phase?

Answers

Angular frequency of pendulum is given by

$\omega = \sqrt{(g)/(l)}$

for both pendulum we have

$\omega_1 = \sqrt{(9.81)/(1.00)}$

$\omega_1 = 3.13 rad/s$

For other pendulum

$\omega_2 = \sqrt{(9.81)/(1.1025)}$

$\omega_2 = 2.98 rad/s$

now we have relate angular frequency given as

[tex\omega_1 - \omega_2 = 3.13 - 2.98 = 0.15 rad/s[/tex]

now time taken to become in phase again is given as

$t = (2\pi)/(\omega_1 - \omega_2)$

$t = (2\pi)/(0.15) = 41.88 s$

now number of oscillations complete in above time

$N = (t)/((2\pi)/(\omega_1))$

$N = (41.88)/((2\pi)/(3.13))$

$N = 21 oscillation$

Which energy depends the arbitrarily assigned zero level

Answers

Potential energy does.

A book on the floor has negative potential energy relative to the seat
of your chair, zero potential energy relative to the floor, and a whole
bunch of positive potential energy relative to the ground if the floor
is the floor of the passenger jet in which you are cruising and dropped
your book on the floor.

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a transformer with a turns ratio (secondary/primary) of 1:10 is used to step down the voltage from a 120-v wall socket to be used in a battery recharging unit. What is the voltage supplied to the recharger?