<h2>
Answer: 12 s</h2>
Explanation:
The situation described here is parabolic movement. However, as we are told <u>the instrument is thrown upward</u> from the surface, we will only use the equations related to the Y axis.
In this sense, the main movement equation in the Y axis is:
(1)
Where:
is the instrument's final position
is the instrument's initial position
is the instrument's initial velocity
is the time the parabolic movement lasts
is the acceleration due to gravity at the surface of planet X.
As we know and 
when the object hits the ground, equation (1) is rewritten as:
(2)
Finding :
(3)
(4)
(5)
Finally:
Answer:
The rougher a surface is, the more friction it can create.
Explanation:
The rougher a surface is, the more "holes" are on the edge which means things can get caught on in because multiple holes can catch each other.
A b c d etc. oh well
Are there any choices perhaps? Gracie
Answer:
2.9 kg
Explanation:
Given that a 0.775-m3 rigid tank initially contains air whose density is 1.18 kg/m3.
According to the definition of density
Density = mass/volume
1.18 = mass / 0.775
Mass = 1.18 × 0.775
Mass = 0.9145 kg
Given that the tank is connected to a high-pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 4.95 kg/m3.
Using the same density formula
Density = mass/volume
4.95 = mass / 0.775
mass = 3.83625 kg
To determine the mass of air that has entered the tank, take away the mass of the air initial in the tank from the mass calculated
Mass = 3.83625 - 0.9145
Mass = 2.923kg
Therefore, the mass of air that has entered the tank is 2.9 kg approximately.
Answer: A.
Explanation: Roughly 180 - 200 million years ago, just before the first dinosaurs evolved. Mammals themselves evolved from a group or reptiles which exhibited mammal-like traits. One of them was specialized teeth. Reptiles tend to have teeth all the same shape. The mammal-like reptiles evolved tiny teeth in front of the jaw and two pairs of over sized fangs along the the sides. Like modern mammals, the head was large in proportion to the rest of the body. The jaws were also evolving another mammal trait, the ability to move sideways. Despite the lack of specialized teeth, acute hearing and the ability to chew, the dinosaurs evolved an adaptation which made them far more successful than mammals--modified leg bones. These limbs could be articulated directly under their bodies. This enabled the legs to support more weight, since the limbs were now under the body instead of at the sides. Then dinosaurs did something which secured their dominance for the next 120 million years - they began to stand on two legs. Although the back was still parallel to the ground, running on two legs greatly increased the dinosaur's speed. Mammals could simply not compete with swift, giant predators and were forced to remain small, and most became nocturnal to evade dinosaurs which were probably active during the day. Despite that they managed to survive which allowed the further evolution of mammals into us, humans.
