PHYSICS HIGH SCHOOL

What is the magnitude of force required to accelerate a car of mass 1.7 × 10³ kilograms by 4.75 meters/secondÆ?A. 3.6 X 10 ^3 N
B. 1.7X10^3 N
C. 8.1X10^3 N
D. 9.0X10^3 N

Answers

Answer 1
Answer:

Answer:

Magnitude of force is F=8.1* 10^3\ N

Explanation:

It is given that,

Acceleration of car, a=4.75\ m\s^2

Mass of car, m=1.7* 10^3\ kg

We have to find magnitude of force. It is given by using Newton's second law of motion which states that force is given by the product of mass and acceleration :

F = m a

F=1.7* 10^3\ kg* 4.75\ m/s^2

F=8.075* 10^3\ N

or

F=8.1* 10^3\ N

Hence, the correct option is (c)

Answer 2
Answer: Best Answer:  8.075*10^3 NewtonsSource(s):Newton's Second Law of Motion P=MA

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The potential energy of a catapult was completely converted into kinetic energy by releasing a small stone with a mass of 20 grams. The velocity of the stone when it reached the target was 15.0 meters/second. What was the value of the kinetic energy of the stone when it reached the target?

Answers

Answer: 2.25 J

Explanation: Kinetic energy is the energy possessed by an object by virtue of its motion.

K.E=(1)/(2)* mv^2

m= mass of object= 20 g = 0.02 kg     (1 kg= 1000 g)

v= velocity of object= 15 m/s

K.E=(1)/(2)* 0.02* 15^2=2.25kgm^2s^(-2)=2.25J

(1J=1kgm^2s^(-2))

1,000 grams = 1 kilogram
20 grams = 0.02 kilogram

Kinetic energy = (1/2) (mass) x (speed)²

                           (1/2) (0.02) x (15)² =

                                 (0.01)  x  (225)  =  2.25 joules
 

If you want to study how energetic waves affect matter, you should study waves with a _______.

Answers

lower frequency ad shorter wave length  is my best guess honestly other wise i suck
I feel like it is Higher frequency and Shorter wavelength...I could be wrong though.

a car requires 1x10^8J of energy to drive 30km. calculate how many kilometers you could hypothetically drive using the energy contained in the rest mass of 100mg of fuel.

Answers

Ah hah !  I spy a question about  E = m c² .
OK, here we go.  Fossen your seat belt, mon,
it's going to be eh boompy rade !

E = energy equivalent of mass
m = the mass of the mass
c = the speed of light

              E  =  (m)  (c)²

                  = (100 mg) (3 x 10⁸ m/s)²

                 =  (1 x 10⁻⁴ kg) (9 x 10¹⁶ m²/s²)

                 =        9 x 10¹²  (kg-m²/s²)

                 =        9 x 10¹²  (kg-m/s²) (m)

                 =        9 x 10¹²  (newton) (m)

                 =        9 x 10¹²  joules .

The car can go 30 km on  10⁸ J of energy.

How far can it go on  9 x 10¹² J ?

                (9 x 10¹² J) x (30 km / 10⁸J)

             =  (9 x 10⁴) x (30 km)  =  2,700,000 km

             =          roughly    7.3 times the distance to the moon.

A constant net torque is applied to a rotating object. Which of the following best describes the object's motion?a. The object will rotate with increasing angular acceleration.
b. The object will have a decreasing moment of inertia.
c. The object will rotate with constant angular velocity.
d. The object will have an increasing moment of inertia.
e. The object will rotate with decreasing angular acceleration.
f. The object will rotate with constant angular acceleration.

Answers

Answer:

f. The object will rotate with constant angular acceleration.

Explanation:

We know that

τ = I α

τ=Torque

I=Moment of inertia of the object

α =Angular acceleration

The moment of inertia is constant for an object and it does not depends on the applied torque.

If applied torque is constant then the angular acceleration of the object will be constant because moment of inertia is constant.

If angular speed is constant then the angular acceleration will,be zero.But in this case object is having angular acceleration that is why it have varying angular speed.

Therefore option "f" is correct.

A . 2 m/s^2
B . 30 m/s^2
C . 30 m/s
D . 0.5 m/s

Answers

Answer:

C-30m/s that my answer

Beth has built a simple series circuit using wire, a battery, a lightbulb, and a switch. The bulb, however, does not light up when the switch is closed. Which describes a step that will help troubleshoot and work toward the solution of this problem?

A.
Reverse the way the wire is connected to the poles of the battery.

B.
Use an electrical meter to test the voltage of the battery.

C.
Shorten the length of wire between the battery and the switch.

D.
Change the wiring scheme to parallel.

Answers

The right answer for the question that is being asked and shown above is that: "A. Reverse the way the wire is connected to the poles of the battery." the statement describes a step that will help troubleshoot and work toward the solution of this problem is that Reverse the way the wire is connected to the poles of the battery.
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