Many dogs have ticks and fleas in their fur. Ticks and fleas feed upon the blood of dogs to get nutrients is that competition, parasitism, mutualism or commensalism

Carlota does 2000 J of work on a machine. The machine does 500 J of work. What is the efficiency of the machine? 4% 25% 75% 400%

Electric energy can be stored by what kind of charges

f 720-nm and 620-nm light passes through two slits 0.68 mm apart, how far apart are the second-order fringes for these two wavelengths on a screen 1.0 m away

What is one advantage of using primary source when doing research on an experiment

A car (mass 1 kg) on a frictionless track collides with a stationary car (mass 0.5 kg). The velocity of the first car before the collision is 2 m/s. The velocity of the 1st car after the collision is 1 m/s.

A fisherman noticed that a float makes 30 oscillations in 15 seconds. The distance between two consecutive crests is 2 m. What is the period and frequency of the wave? What is the wave speed?

A small spaceship with a mass of only 2.6 ✕ 103 kg (including an astronaut) is drifting in outer space with negligible gravitational forces acting on it. If the astronaut turns on a 12 kW laser beam, what speed will the ship attain in 1.

What will be the acceleration of a skydiver when air resistance builds up to 86% of her weight? assume the acceleration due to gravity is 10 m/s 2. answer in units of m/s 2?

A 255 g lead ball at a temperature of 81.6°C is placed in a light calorimeter containing 153 g of water at 22.3°C. Find the equilibrium temperature of the system.

Using the equation T=2π√L/g solve for L