The material that is the best choice for the head of a hammer is a metal. Having a metal for a hammer head allows you to have a light-weight but heavy duty hammer. Since a hammer is a tool that is used to strike an object repeatedly, a light weight is essential since you would be repeatedly making that motion.
A
An object at rest will remain at rest unless acted on by a force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by a force.
Explanation:
Answer:
v = 135.13 mph
Explanation:
Given that,
The race car was moving for 3.7 hours and during that time it traveled a distance of 500 miles south.
We need to find the speed of the car.
We know that,
Speed = distance/time
So,
So, the speed of the car is equal to 135.13 mph.
When a conductor is passed through a magnetic field, a current is induced in the CONDUCTOR.
This process is called electromagnetic induction. Electromagnetic induction involves the production of electromotive force in an electrical conductor in a magnetic field. Electromagnetic induction can be generated using two different methods:
1. By keeping the electric conductor in a moving magnetic field.
2. By keeping the electric conductor in constant motion in a static magnetic field.
Answer:
The string must support the tension of 392 N.
Explanation:
The tension that the string must support should equal the centripetal force exerted on the on the stone as it goes in a circular path (because if the string supported less tension, it would break).
The centripetal force exerted on the stone is
where
<em>v</em> = velocity of the stone in m/s
<em>m</em> = mass of the stone in kg
<em>R</em> = radius of the circular path.
Now the velocity of the stone is 7.00 m/s, the mass of the stone is 4000g or 4 kg (1000 g = 1kg), and the radius of the circular path is just the length of the string, and it is 50 cm or 0.5 m (100cm =1m); therefore, we get
m = 4kg
v =7m/s
R = 0.5m.
We put these values into the equation for the centripetal force and get:
The centripetal force is 392 Newtons, and therefore, the tension that the string must support mus be 392 N.