The atomic mass of an element whose atoms consist of seven protons, eight neutrons, and seven electrons is _____?a. 7
b. 14
c. 15
d. 22

Answers

Answer 1

Answer: The atomic mass is C. 15

Atomic mass = P + N = 7+8 = 15

The atomic mass of an element is defined as the sum of the protons and neutrons. On the other hand, the atomic number of a neutral element is equivalent to the number of protons or electrons. This is because a neutral element should have equal number of protons and electrons.

Answer 2

Answer:

Answer:

Explanation:

Related Questions

What happens during a muscle contraction
Specific data such as age, income, family size, and occupation, used for marketing purposes, is called A. a secondary market.B. demographics.C. survey statistics.D. the target market.
Forces that are unequal in size but opposite in direction will cause movement.A) true B)false
If the absolute pressure of a gas is 550.280 kPa, its gage pressure is A. 101.325 kPa.B. 651.605 kPa.C. 277.280 kPa.D. 448.955 kPa.
If an athlete expends 3480. kJ/h, how long does she have to play to work off 1.00 lb of body fat? Note that the nutritional calorie (Calorie) is equivalent to 1 kcal, and one pound of body fat is equivalent to about 4.10 × 103 Calories.

Which would best reduce the amount of energy needed to pull a wagon up a ramp?1.Increasing the slope of the ramp
2.Reducing the friction between the wagon wheels
3.Reducing the length of the wagon handle
4.Increasing the friction between the wagon wheels

Answers

Answer:

2.Reducing the friction between the wagon wheels

Explanation:

If the friction between the wagon wheels and the rail is reduced, then less force will be needed to pull the wagon up. This is because the friction force goes in the opposite direction of the movement, that is, friction force opposes the desired movement, making it more difficult.

2. reducing the friction between wagon weels

What is the velocity of the dart just before the collision?

Answers

Answer: 1.38 m/s to the right.

Explanation: We can solve this problem using the principle of conservation of momentum. The momentum of an object is defined as the product of its mass and velocity, and the total momentum of a closed system is conserved, meaning that the total momentum before a collision is equal to the total momentum after the collision.Let the initial velocity of the dart be v, and let the final velocity of the dart and the block be vf. The momentum of the dart before the collision is given by p = mv, where m is the mass of the dart. The momentum of the dart and block after the collision is given by (m + M)vf, where M is the mass of the block.Using the principle of conservation of momentum, we have:p = (m + M)vfSubstituting the given values, we get:0.012 kg v = (0.012 kg + 0.2 kg) 0.78 m/sSimplifying, we get:v = (0.212 kg) (0.78 m/s) / 0.012 kgv ≈ 1.38 m/sTherefore, the velocity of the dart just before it hits the block is approximately 1.38 m/s to the right.

Physics question WILL GIVE BRAINLIEST!!! A 1,600 kg train car rolling freely on level track at 16 m/s bumps into a 1.0 x 10^3 kg train car moving at 10.0 m/s in the same direction, and the two latch onto each other and continue together. What is their final speed?10 m/s
14 m/s
6.0 m/s
16 m/s

Answers

Answer:

$v'\approx 14\ m/s$

Explanation:

Linear Momentum

Two objects of masses and moving in a linear path at speeds and respectively have a total momentum of

$p=m_1v_1+m_2v_2$

When the objects collide, a change of conditions occurs and they start to move at different speeds. The necessary condition to find the after-colliding speeds is the conservation of linear momentum that states the total momentum of an isolated system doesn't change regardless of the internal interactions of the objects. Thus, the new momentum is

$p'=m_1v_1'+m_2v_2'$

And they must be the same, thus

$m_1v_1'+m_2v_2'=m_1v_1+m_2v_2$

We know both cars stick together after the collision, so the final speed is common to both, and the above formula becomes

$(m_1+m_2)v'=m_1v_1+m_2v_2$

Solving for v'

$\displaystyle v'=(m_1v_1+m_2v_2)/((m_1+m_2))$

Plugging in the values, we have

$\displaystyle v'=((1600)(16)+(1000)(10))/((1600+1000))$

$\boxed{v'=13.69\ m/s}$

Correct option (closest to the computed speed): 14 m/s

A car drives for 3 hours at 40 mph, and then drives 300 miles at 60 mph. what is the car's average speed, in mph?

Answers

Answer:

52.5 mph

Explanation:

part 1,

speed=40mph

distance= 40×3=120 miles

time= 3 hours

part 2

speed= 60mph

distance= 300 miles

time= 300÷60= 5hours

Average speed= (300+120)÷(5+3) = 52.5mph

Haloke does 176 J of work lifting himself 0.300m at a constant speed. What is Haloke's mass?

Answers

Since he's lifting himself at constant speed ... not accelerating ... the net vertical force on
him is zero, meaning that he must be lifting with force that's exactly equal to his weight.

Potential energy he added during the lift = (mass) x (gravity) x (height)

Mass = (energy) / (gravity x height) = 176 / (9.8 x 0.3) = 59.864 kg

an suv is traveling at a speed of 18 m/s. If the suv has a mass of 1,550 kg, what force must be applied to stop it in 8 seconds?

Answers

Vo = 18m/s
Vt = 0 -> cause speed boat will stop in 8 s
m = 1550kg
t= 8s

F,,???/

Vt = Vo - a.t
0 = 18 - a.8
18 = a8
a=2,25m/s^2

F = m.a
F = 1550 . 2,25
F =3487,5N

The force that must be applied to stop the SUV in 8 seconds is approximately 3,487.5 Newtons (N).

To calculate the force required to stop the SUV, we can use Newton's second law of motion, which states that force (F) is equal to mass (m) times acceleration (a). In this case, the acceleration is the change in velocity over time.

First, let's find the acceleration (a):

Acceleration (a) = (final velocity - initial velocity) / time

a = (0 m/s - 18 m/s) / 8 s

a = -18 m/s / 8 s

a = -2.25 m/s²

The negative sign indicates that the SUV is decelerating or slowing down.

Now, we have the acceleration (-2.25 m/s²) and the mass of the SUV (1,550 kg). We can use Newton's second law to find the force:

Force (F) = mass (m) x acceleration (a)

F = 1,550 kg x (-2.25 m/s²)

F = -3,487.5 N

To know more about acceleration here

brainly.com/question/2303856