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oksian1 [2.3K]
4 years ago
14

The horizontal surface on which the block slides is frictionless. If F = 20 N and M = 5.0 kg, what is the magnitude of the resul

ting acceleration of the block?
Physics
1 answer:
Digiron [165]4 years ago
7 0

Answer:

a=4m/s^2

Explanation:

Using Newton's second law:

F=ma

Where F is the force applied on the object, m is the mass of the object, and a is the acceleration.

In this case we need the acceleration, so we clear for a:

a=\frac{F}{m}

we know that the force is: F=20N, and the mass: m=5kg

so the acceleration:

a=\frac{20N}{5kg}

a=4m/s^2

the acceleration of the block is: a=4m/s^2

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An electric heating element is connected to a 110 V circuit and a current of 3.2 A is flowing through the element. How much ener
UkoKoshka [18]

Power (rate of using energy) = (voltage) x (current)

Power of this heating element = (120 V) x (3.2 A) = 384 watts


The easy way:

     384 watts = 0.384 kilowatt

     (0.384 kilowatt) x (5 hours) = 1.92 kilowatt-hour


Another way:
     
                            384 watts = 384 joules per second .

        (384 joule/sec) x (3600 sec/hour) x (5 hours)  

=      (384 x 3600 x 5) (joules)  =  6,912,000 joules.

6 0
3 years ago
Read 2 more answers
A water skier lets go of the tow rope upon leaving the end of a jump ramp at a speed of 14.0 m/s. As the drawing indicates, the
NISA [10]

Answer:

1.38 metres

Explanation:

Using the law of conservation of energy, the mechanical energy when leaving the ramp is same as mechanical energy when the skier is at the highest point

When leaving the ramp, sum of kinetic energy and potential energy will be

Ei=KEi+PEi where Ei is initial mechanical energy, KEi is initial kinetic energy and Pei is initial potential energy

KEi=0.5mv^{2} where v is the initial speed and m is mass

PEi=mgh but since h=0, PEi=0 where m is mass, g is gravitational constant and h is height

Therefore, Ei=KEi+PEi=0.5mv^{2}+0=0.5m*14^{2}+0=98m

The mechanical energy of the skier at the highest point is given by

Ef=KEf+PEf where Ef is final energy, KEf is final kinetic energy and PEf is final potential energy

Ef=0.5mv^{2}+mgh=m(0.5v^{2}+gh)=m(0.5*13^{2}+9.81h)=m(84.5+9.81h)

Equating Ei=Ef then

98m= m(84.5+9.81h)

98-84.5=9.81h

h=13.5/9.81= 1.376147m

h=1.38 metres

5 0
3 years ago
ALL OF MY POINTS FOR THIS!
scoray [572]
Newton's 2nd law of motion:

                       Force  =  (mass) x (acceleration)

                                   =  (1,127 kg) x (6 m/s² forward)

                                   =  (1,127 x 6)  newtons forward

                                   =    6,762 newtons forward
______________________________

             Momentum  =  (mass) x (speed)

                                 =   (69 kg) x (6 m/s)

                                 =      414 kg-m/s
3 0
4 years ago
A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly abov
Rudik [331]

Answer:

Apparent depth (Da) = 60.15 cm (Approx)

Explanation:

Given:

Distance from fish (D) = 80 cm

Find:

Apparent depth (Da)

Computation:

We know that,

Refractive index of water (n2) = 1.33

So,

Apparent depth (Da) = D(n1/n2)

Apparent depth (Da) = 80 (1/1.33)

Apparent depth (Da) = 60.15 cm (Approx)

5 0
3 years ago
A car is traveling 12m/s. It approaches a stop sign and decelerates at 4.0m/s squared. How long does it take the car to stop?
beks73 [17]
It would take
12/4 = 3
that's 3 seconds ..
8 0
4 years ago
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