Answer:
20 [N], in the opposite direction of the first force.
Explanation:
We know that newton's second law stipulates that the sum of forces on a body must be equal to the product of mass by acceleration.
The negative sign means that the other force acting on the body must be in the opposite direction to the force of 30 [N]
The correct answer is "3. Both increase"
In fact, the frequency of a vibrating string is given by
where L is the length of hte string, T the tension and
the linear mass density.
We can see that string is made shorter, L decreases, so the frequency f increases. And since the pitch has the same behaviour of the frequency, it increases as well.
Answer:
displacement
Explanation:
Displacement gives information both about how far away an object is from a given point and in what direction the object is from that point
Answer:
the correct answer is B
Explanation:
Mechanical waves need a material medium that supports them for their transmission, sound is a material wave that is transmitted by the longitudinal vibrations of material media, one of the media through which sound is transmitted is air, but if it is in contact with other media, water, wood, metal, etc., it can also be transmitted by these means.
In this experiment for case X, sound is transmitted through the floor, but since there is no air, it cannot be transmitted
In experiment Y, sound is transmitted through the floor and through the air, therefore, having two transmission media, the energy captured by the sensor must be greater in this experiment.
when examining the answers the correct one is B
Answer:
29 m/s
Explanation:
Acceleration is the rate of change of velocity, i.e, the change in velocity per unit time.
The driver made the car to accelerate at 3 m/s^2. That means than in every second the velocity of the car increased by 3 m/s. Therefore in four seconds its velocity would increase by 3m/s x 4 = 12m/s. Starting with an initial velocity of 17 m/s the final velocity would be 17 m/s + 12 m/s = 29 m/s.