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A force of 15 N is applied to an object, causing it to accelerate at 3 m/s^2. Find its mass.

m = F/a = 15/3 = 5 kg

If an object falls freely for 5 seconds, how far does it fall?

s = 1/2 x 9.8 x 5^2 = 122.5 m

A wave has a frequency of 50 Hz and a wavelength of 4 m. What is its speed?

v = frequency x wavelength = 50 x 4 = 200 m/s

A light bulb uses 60 W of power for 2 hours. How much energy does it consume?

E = P x t = 60 x 2 = 120 Wh

An object moves with a velocity of 20 m/s and accelerates at 2 m/s2 for 3 seconds. Find its final velocity.

v = v(0) + at = 20 + (2 x 3) = 26 m/s

Calculate the gravitational force on a 2 kg object on Earth (g = 9.8 m/s2)

F = mg = 2 x 9.8 = 19.6 N

A box is pushed with a force of 10N and moves 5 m. How much work is done?

W = F x d = 10 x 5 = 50 J

A car travels 120 km in 2 hours. What is its average speed?

60 km/h

What is the volume of 2 moles of gas at standard temperature and pressure?

44.8 L

How many grams of NaCl are in 0.5 moles?

29.25 g

What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-3 M?

pH = -log(1 x 10^-3) = 3

How many atoms are there in 2 moles of oxygen gas (O2)? (Avogadro's number = 6.002 x 10^23)

2.41 x 10^24 atoms

If 5 g of NaCl is dissolved in 100 g of water, what is the mass percentage of NaCl in the solution?

4.76%

Balance the equation: H2 + O2 => H2O

2H2 + O2 => 2H2O

How many moles are in 36 g of H2O?

2

Calculate the molar mass of H2O.

18 g/mol

A square has an area of 49 cm2. Find its perimeter.

28

Find the perimeter of a rectangle with a length of 8 cm and a width of 5 cm.

26

A car travels 240 km in 4 hours. What is the average speed?

60 km/h

Solve for y: 3y - 8 = 2y + 5

13

A shop offers a 20% discount on a $50 item. What is the final price?

40

Find the area of a circle with a radius of 7 cm.

153.86 cm2

A triangle has sides of lengths 5 cm, 12 cm, and 13 cm. Is it a right triangle?

Yes

Solve for x: 2x + 5 = 15

5